{"id":62798,"date":"2026-07-29T03:19:51","date_gmt":"2026-07-29T03:19:51","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=62798"},"modified":"2026-07-29T03:19:53","modified_gmt":"2026-07-29T03:19:53","slug":"4j29-plate","status":"publish","type":"post","link":"https:\/\/www.kaysuns.com\/ru\/4j29-plate\/","title":{"rendered":"4J29 Plate"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"62798\" class=\"elementor elementor-62798\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3c481e2 e-flex e-con-boxed e-con e-parent\" data-id=\"3c481e2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e2fc3a5 elementor-widget elementor-widget-heading\" data-id=\"e2fc3a5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">4J29 Plate<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cd6a7a0 e-con-full e-flex e-con e-child\" data-id=\"cd6a7a0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-2338f68 e-con-full e-flex e-con e-child\" data-id=\"2338f68\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3c84ae7 elementor-widget elementor-widget-text-editor\" data-id=\"3c84ae7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tA <strong>4J29 Plate<\/strong> is a flat-rolled sheet form of Kovar,a vacuum-melted, iron-nickel-cobalt controlled-expansion alloy.Its chemical composition consists of approximately 29% Nickel,17% Cobalt,and 54% Iron.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6d7685b elementor-widget elementor-widget-text-editor\" data-id=\"6d7685b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tThe defining characteristic of a 4J29 plate is its coefficient of thermal expansion,which matches the expansion rates of borosilicate glass and alumina ceramics across a wide temperature range (20\u00b0C to 450\u00b0C).This prevents stress fractures,making it the industry-standard material for creating reliable,airtight glass-to-metal and ceramic-to-metal hermetic seals.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4e2810e elementor-widget elementor-widget-heading\" data-id=\"4e2810e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Key Specifications &amp; Properties<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cff369b elementor-widget elementor-widget-text-editor\" data-id=\"cff369b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>Standard Designations:<br \/>It is equivalent to international standards like ASTM F15, UNS K94610, DIN Werkstoff Nr. 1.3981, and Chinese GB\/T 15018.<\/li><li>Alternative Trade Names:<br \/>Commonly referred to as Kovar Alloy, Nilo K, Dilver P0, and Vacon 12.<\/li><li>Physical Characteristics:<br \/>Features high structural stability at low temperatures,high tensile strength,and forms a dense oxide layer that allows glass to securely wet and bond to it.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ed83a3a e-con-full e-flex e-con e-child\" data-id=\"ed83a3a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-43a5323 elementor-widget elementor-widget-image\" data-id=\"43a5323\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"768\" height=\"432\" src=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2026\/07\/Kovar-4J29-Plate-Provider-in-China-768x432.webp\" class=\"attachment-medium_large size-medium_large wp-image-62866\" alt=\"Kovar 4J29 Plate Provider in China\" srcset=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2026\/07\/Kovar-4J29-Plate-Provider-in-China-768x432.webp 768w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2026\/07\/Kovar-4J29-Plate-Provider-in-China-300x169.webp 300w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2026\/07\/Kovar-4J29-Plate-Provider-in-China-1024x576.webp 1024w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2026\/07\/Kovar-4J29-Plate-Provider-in-China-1536x864.webp 1536w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2026\/07\/Kovar-4J29-Plate-Provider-in-China-18x10.webp 18w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2026\/07\/Kovar-4J29-Plate-Provider-in-China-e1785294622110.webp 1000w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0901160 elementor-widget elementor-widget-heading\" data-id=\"0901160\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Applications of 4J29 Plate<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a2612d5 e-con-full e-flex e-con e-child\" data-id=\"a2612d5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-4c5d935 e-con-full e-flex e-con e-child\" data-id=\"4c5d935\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-62bffef elementor-widget-tablet__width-initial elementor-widget-mobile__width-initial elementor-icon-list--layout-traditional elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"62bffef\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-square-full\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Glass seals<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-square-full\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Ceramic seals<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-square-full\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Transistor headers<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-square-full\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Lead frames<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-square-full\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Electronic packaging<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-square-full\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Microwave tubes<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-square-full\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">X-ray tubes<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-square-full\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Integrated circuits<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5bde72d e-con-full e-flex e-con e-child\" data-id=\"5bde72d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7800e5d elementor-widget-tablet__width-initial elementor-widget-mobile__width-initial elementor-icon-list--layout-traditional elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"7800e5d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-square-full\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Vacuum components<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-square-full\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Hermetic plugs<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-square-full\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Laser components<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-square-full\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Sensor housings<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-square-full\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Aerospace relays<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-square-full\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Power modules<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-square-full\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Magnetron parts<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<i aria-hidden=\"true\" class=\"fas fa-square-full\"><\/i>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Waveguide windows<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a591166 elementor-widget elementor-widget-text-editor\" data-id=\"a591166\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tWe offer 4J29 plates and sheets in thicknesses of 0.8 &#8211; 105.We offer not only <a href=\"https:\/\/www.kaysuns.com\/stainless-steel-plates\/\" target=\"_blank\" rel=\"noopener\">stainless steel plates<\/a> and sheets but also plates made of Hastelloy,Incoloy,Inconel,Monel,and other alloys.Our products comply with ASTM A240,EN 10204,ISO 9001,PED 2014\/68\/EU ,CE,and other standards.With over a decade of experience in manufacturing and import\/export,we are your best wholesaler in China.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-0ced2b3 e-flex e-con-boxed e-con e-parent\" data-id=\"0ced2b3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c451c2f elementor-widget elementor-widget-heading\" data-id=\"c451c2f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Chemical Composition of 4J29 Plate<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1629d34 elementor-widget elementor-widget-text-editor\" data-id=\"1629d34\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tThe chemical composition of a 4J29 Plate is strictly controlled under standard specifications like GB\/T 15018 and ASTM F15 to guarantee precise,uniform thermal expansion properties.\n<table>\n<thead>\n<tr>\n<th bgcolor=\"#00a0e9\">Ni<\/th>\n<th bgcolor=\"#00a0e9\">Co<\/th>\n<th bgcolor=\"#00a0e9\">Fe<\/th>\n<th bgcolor=\"#00a0e9\">Mn<\/th>\n<th bgcolor=\"#00a0e9\">Si<\/th>\n<th bgcolor=\"#00a0e9\">Cr<\/th>\n<th bgcolor=\"#00a0e9\">Cu<\/th>\n<th bgcolor=\"#00a0e9\">C<\/th>\n<th bgcolor=\"#00a0e9\">P<\/th>\n<th bgcolor=\"#00a0e9\">S<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>28.5 &#8211; 29.5<\/td>\n<td>16.8 &#8211; 17.8<\/td>\n<td>Balance<\/td>\n<td>\u2264 0.50<\/td>\n<td>\u2264 0.30<\/td>\n<td>\u2264 0.20<\/td>\n<td>\u2264 0.20<\/td>\n<td>\u2264 0.03<\/td>\n<td>\u2264 0.02<\/td>\n<td>\u2264 0.02<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d91793f elementor-widget elementor-widget-heading\" data-id=\"d91793f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Impact of Composition on Performance<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cae97d1 e-con-full e-flex e-con e-child\" data-id=\"cae97d1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-dbc2390 e-con-full e-flex e-con e-child\" data-id=\"dbc2390\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-82718d7 elementor-widget elementor-widget-heading\" data-id=\"82718d7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Phase Stability &amp; Cryogenic Resistance<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2be2bc2 elementor-widget elementor-widget-text-editor\" data-id=\"2be2bc2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tThe ratio between Ni, Co, and Fe ensures that the 4J29 plate maintains a stable Face-Centered Cubic (FCC) austenite structure from extremely low temperatures up to over 400\u00b0C.If Nickel falls below 28.5%,the alloy risks transforming into body-centered cubic (BCC) martensite at sub-zero temperatures. This phase shift causes a permanent,irreversible volumetric expansion,which would rupture any glass-to-metal seal.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e26aed4 e-con-full e-flex e-con e-child\" data-id=\"e26aed4\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a4f725d elementor-widget elementor-widget-heading\" data-id=\"a4f725d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Formation of Interfacial Oxide Layer<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ae566a4 elementor-widget elementor-widget-text-editor\" data-id=\"ae566a4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tElements like Mn and Si play a crucial hidden role during the pre-oxidation heat treatment.When a 4J29 plate is heated in a controlled atmosphere before sealing,it develops a dense,tightly adhering surface oxide film (Fe<sub>3<\/sub>O<sub>4<\/sub> and FeO matrices embedded with trace manganese).Molten borosilicate glass flows smoothly across and physically &#8220;wets&#8221; this specialized oxide layer,yielding a reliable,gas-tight hermetic bond.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f5ddbc5 e-con-full e-flex e-con e-child\" data-id=\"f5ddbc5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ec7f38e elementor-widget elementor-widget-heading\" data-id=\"ec7f38e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Outgassing Suppression<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a613313 elementor-widget elementor-widget-text-editor\" data-id=\"a613313\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tThe tight cap on Carbon is mandatory for ultra-high vacuum applications.If carbon percentages were higher,it would react with oxygen at sealing temperatures (\uff1e 900\u2103),generating carbon monoxide or carbon dioxide gas bubbles directly at the glass-metal interface,destroying the seal&#8217;s structural integrity.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6a5134b e-flex e-con-boxed e-con e-parent\" data-id=\"6a5134b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-92bf1c9 elementor-widget elementor-widget-heading\" data-id=\"92bf1c9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">4J29 Plate Standards &amp; Equivalent Designations<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d17dfdc elementor-widget elementor-widget-text-editor\" data-id=\"d17dfdc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<table>\n<thead>\n<tr>\n<th colspan=\"6\" bgcolor=\"#00a0e9\">4J29 \/ Kovar Alloy (Glass-to-Metal Sealing &amp; Controlled Expansion)<\/th>\n<\/tr>\n<tr>\n<th bgcolor=\"#00a0e9\">Standard<\/th>\n<th bgcolor=\"#00a0e9\">Equivalent Designation<\/th>\n<th bgcolor=\"#00a0e9\">Product Form<\/th>\n<th bgcolor=\"#00a0e9\">GB \/ YB<\/th>\n<th bgcolor=\"#00a0e9\">GJB<\/th>\n<th bgcolor=\"#00a0e9\">GOST<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td bgcolor=\"#05b8e4\">Chinese <\/td>\n<td>4J29 (Fe-Ni29-Co17)<\/td>\n<td bgcolor=\"#05b8e4\">Plates, Sheets &amp; Strips<\/td>\n<td>YB\/T 5231 \/ GB\/T 15018<\/td>\n<td>GJB 1950A<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#05b8e4\">Russian \/ CIS<\/td>\n<td>29NK \/ 29\u041d\u041a<\/td>\n<td bgcolor=\"#05b8e4\">Bars &amp; Rods<\/td>\n<td>GB\/T 14985<\/td>\n<td>&#8211;<\/td>\n<td>GOST 14080 \/ 10994<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#05b8e4\">ISO<\/td>\n<td>NiCo2918 \/ FeNi29Co17<\/td>\n<td bgcolor=\"#05b8e4\">Seamless Pipes &amp; Tubes<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#05b8e4\">UNS<\/td>\n<td>UNS K94610<\/td>\n<td bgcolor=\"#05b8e4\">Welded Pipes &amp; Tubes<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#05b8e4\">ASTM<\/td>\n<td>ASTM F15 \/ AMS 7726,7727,7728<\/td>\n<td bgcolor=\"#05b8e4\">Forgings &amp; Rings<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#05b8e4\">W.Nr. \/ DIN <\/td>\n<td>W.Nr. 1.3981 \/ DIN 17745<\/td>\n<td bgcolor=\"#05b8e4\">Wires &amp; Profiles<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#05b8e4\">Generic Trade Name<\/td>\n<td>Kovar, Pernifer 2918, Dilver P1<\/td>\n<td bgcolor=\"#05b8e4\">All Available Forms<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<td>&#8211;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-eac3af7 elementor-section-content-middle elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"eac3af7\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-b0ceb9d\" data-id=\"b0ceb9d\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-880595a elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"880595a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Have a requirement?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ca68b6c elementor-widget elementor-widget-heading\" data-id=\"ca68b6c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<span class=\"elementor-heading-title elementor-size-medium\">Kaysuns is a professional supplier of 4J29 Plates.Please feel free to contact me if you have any requirements.<\/span>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-50 elementor-top-column elementor-element elementor-element-16d14bf\" data-id=\"16d14bf\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-1169c49 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"1169c49\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Contact Us For More Information\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f553594 elementor-align-center elementor-mobile-align-center elementor-widget__width-initial elementor-widget elementor-widget-button\" data-id=\"f553594\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6IjQ2ODEzIiwidG9nZ2xlIjpmYWxzZX0%3D\" target=\"_blank\" id=\"#241018\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Contact Us<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t<div class=\"elementor-element elementor-element-ec73062 e-flex e-con-boxed e-con e-parent\" data-id=\"ec73062\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-472311b elementor-widget elementor-widget-heading\" data-id=\"472311b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Mechanical Properties of 4J29 Plate<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c8be262 e-con-full e-flex e-con e-child\" data-id=\"c8be262\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ba7f45b elementor-widget elementor-widget-text-editor\" data-id=\"ba7f45b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<table>\n<thead>\n<tr>\n<th bgcolor=\"#00a0e9\">Material State<\/th>\n<th bgcolor=\"#00a0e9\">Tensile Strength<\/th>\n<th bgcolor=\"#00a0e9\">Yield Strength<\/th>\n<th bgcolor=\"#00a0e9\">Elongation<\/th>\n<th bgcolor=\"#00a0e9\">Hardness<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td bgcolor=\"#05b8e4\">Annealed (Soft)<\/td>\n<td>450 \u2013 590 MPa<\/td>\n<td>\u2264 340 MPa<\/td>\n<td>\u2265 30%<\/td>\n<td>\u2264 170 HV (160 HB)<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#05b8e4\">Cold-Rolled (Deep-Drawn)<\/td>\n<td>590 \u2013 780 MPa<\/td>\n<td>450 \u2013 680 MPa<\/td>\n<td>\u2265 10%<\/td>\n<td>\u2264 170 &#8211; 220 HV (160 &#8211; 210 HB)<\/td>\n<\/tr>\n<tr>\n<td bgcolor=\"#05b8e4\">Hard (Full Hard)<\/td>\n<td>\u2265 780 MPa<\/td>\n<td>\u2265 680 MPa<\/td>\n<td>\u2264 3%<\/td>\n<td>\u2265 220 HV (210 HB)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8daee34 e-con-full e-flex e-con e-child\" data-id=\"8daee34\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-f43f020 e-con-full e-flex e-con e-child\" data-id=\"f43f020\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c9e75b1 elementor-widget elementor-widget-heading\" data-id=\"c9e75b1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Elastic Modulus &amp; Poisson's Ratio<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-db0928a elementor-widget elementor-widget-text-editor\" data-id=\"db0928a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>Modulus of Elasticity:<br \/>Approximately 138 GPa at room temperature. As temperature increases toward the Curie point (430 \u2103), the modulus drops slightly, which helps cushion the residual stresses during the glass-to-metal cooling phase.<\/li><li>Poisson&#8217;s Ratio:<br \/>0.30,aligning perfectly with typical structural alloys.<\/li><li>Shear Modulus:Approximately 53 GPa.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7c15b08 e-con-full e-flex e-con e-child\" data-id=\"7c15b08\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-514efe4 elementor-widget elementor-widget-heading\" data-id=\"514efe4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Fatigue and Impact Toughness<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-991d553 elementor-widget elementor-widget-text-editor\" data-id=\"991d553\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<ul><li>Impact Strength:<br \/>4J29 exhibits excellent toughness,showing no sharp ductile-to-brittle transition even at cryogenic temperatures,due to its stable FCC austenite microstructure.<\/li><li>Machinability Rating:<br \/>Relatively low (around 35 &#8211; 40% of B1112 screw stock).It is gummy and prone to work-hardening.Sharp tools,rigid setups,and sulfur-free cutting fluids are required.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4bf44df elementor-widget elementor-widget-heading\" data-id=\"4bf44df\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Processing and Thermal Impacts<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-69e9924 e-con-full e-flex e-con e-child\" data-id=\"69e9924\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-31b1649 e-con-full e-flex e-con e-child\" data-id=\"31b1649\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2e7d5f2 elementor-widget elementor-widget-heading\" data-id=\"2e7d5f2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Deep-Drawing Behavior<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6c74e7e elementor-widget elementor-widget-text-editor\" data-id=\"6c74e7e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>For 4J29 plates used to stamp or deep-draw miniature electronic housings and flat packs,grain size control is critical.<\/p><ul><li>The grain size must be held strictly between ASTM No. 7 and No. 10.<\/li><li>If the grain structure is too coarse (lower than No. 7),the plate will exhibit the &#8220;orange peel&#8221; effect during forming,creating microscopic surface cracks that lead to vacuum leaks after sealing.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7eb58a0 e-con-full e-flex e-con e-child\" data-id=\"7eb58a0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7c28b3d elementor-widget elementor-widget-heading\" data-id=\"7c28b3d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">The Effect of Sealing Temperature on Hardness<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d63dfed elementor-widget elementor-widget-text-editor\" data-id=\"d63dfed\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>During the glass-firing process, the 4J29 plate is exposed to high temperatures between 900\u2103 and 1000\u2103.<\/p><ul><li>This thermal cycle acts as a full recrystallization anneal.<\/li><li>Any cold-work strength introduced during stamping is eliminated.<\/li><li>Post-seal components automatically return to the fully annealed soft state (\u2248 450 MPa tensile strength,\u2264 170 HV).Designers must calculate structural loads based on these post-annealed soft values rather than the initial cold-rolled delivery state.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b964b88 e-con-full e-flex e-con e-child\" data-id=\"b964b88\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-a53aca2 e-con-full e-flex e-con e-child\" data-id=\"a53aca2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9eba304 elementor-widget elementor-widget-heading\" data-id=\"9eba304\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h4 class=\"elementor-heading-title elementor-size-default\">Microstructural Stability<\/h4>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2475298 elementor-widget elementor-widget-text-editor\" data-id=\"2475298\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tUnder mechanical stress or severe cold deformation combined with sub-zero temperatures,unstable chemistry can trigger a partial transition from austenite to martensite.This transformation hardens the material but critically damages the thermal expansion match,causing joint failure.Proper chemical balancing prevents this mechanical degradation.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-a8bb2a9 e-con-full e-flex e-con e-child\" data-id=\"a8bb2a9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7e6ef35 e-flex e-con-boxed e-con e-parent\" data-id=\"7e6ef35\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6b4caa9 elementor-widget elementor-widget-heading\" data-id=\"6b4caa9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Our Advantages in  Manufacturing 4J29 Plate<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7c1a53e e-con-full e-flex e-con e-child\" data-id=\"7c1a53e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-ce72ba6 e-con-full e-flex e-con e-child\" data-id=\"ce72ba6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-423fc0c elementor-widget elementor-widget-heading\" data-id=\"423fc0c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Ultra-Pure Vacuum Melting<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b82b0fc elementor-widget elementor-widget-text-editor\" data-id=\"b82b0fc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tWe utilize advanced vacuum induction melting combined with vacuum arc remelting.This dual-melting approach lowers gas content like carbon,oxygen,and hydrogen to absolute minimum levels.The ultra-clean chemistry guarantees a defect-free surface,entirely preventing microscopic outgassing bubbles from developing at the glass-metal junction during high-temperature glass firing.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1557c1a e-con-full e-flex e-con e-child\" data-id=\"1557c1a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3ac7fd8 elementor-widget elementor-widget-heading\" data-id=\"3ac7fd8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Precise Gauge Tolerance<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d825a7b elementor-widget elementor-widget-text-editor\" data-id=\"d825a7b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tOur cold-rolling mill incorporates automatic gauge control systems to achieve extremely tight thickness tolerances across the entire plate.This exceptional dimensional uniformity prevents thickness variations from causing uneven heat distribution or clamping pressures.It directly translates into higher yield rates and seamless performance during automated high-speed stamping and deep-drawing lines.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-dc352ae e-con-full e-flex e-con e-child\" data-id=\"dc352ae\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-e4f0b83 e-con-full e-flex e-con e-child\" data-id=\"e4f0b83\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-90bc2ce elementor-widget elementor-widget-heading\" data-id=\"90bc2ce\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Uniform Grain Structure<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8ef9121 elementor-widget elementor-widget-text-editor\" data-id=\"8ef9121\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tWe enforce strict thermo-mechanical processing to control the final recrystallized grain size,holding it consistently between ASTM No. 7 and No. 10.This fine,homogeneous grain matrix completely eliminates the &#8220;orange peel&#8221; roughness or localized thinning during heavy stamping.It also guarantees a reliable,predictable rate of thermal expansion across every axis of the plate.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-af6a075 e-con-full e-flex e-con e-child\" data-id=\"af6a075\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-34a39a7 elementor-widget elementor-widget-heading\" data-id=\"34a39a7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Optimal Oxide Control<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-325731f elementor-widget elementor-widget-text-editor\" data-id=\"325731f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tOur specialized,tension-free annealing lines deliver a uniform,bright surface finish with zero surface contamination.This optimized surface roughness facilitates the rapid,even formation of a dense,tightly adhering interfacial oxide film (Fe\u2083O\u2084 and FeO).The balanced oxide chemistry allows liquid borosilicate glass or alumina ceramics to wet perfectly,creating absolute gas-tight seals.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-08a6405 e-flex e-con-boxed e-con e-parent\" data-id=\"08a6405\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a8edaa3 elementor-widget elementor-widget-heading\" data-id=\"a8edaa3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">FAQs About 4J29 Plate<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d35ec6d elementor-widget elementor-widget-accordion\" data-id=\"d35ec6d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"accordion.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion\">\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-2211\" class=\"elementor-tab-title\" data-tab=\"1\" role=\"button\" aria-controls=\"elementor-tab-content-2211\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Can 4J29 plates be used in sub-zero environments?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-2211\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"1\" role=\"region\" aria-labelledby=\"elementor-tab-title-2211\"><strong>Yes.<\/strong>High-quality 4J29 plates maintain a stable austenite phase down to -196\u00b0C.However,the chemical composition must be pure.If nickel falls below 28.5%,the material can transform into martensite at low temperatures,causing permanent volume expansion and rupturing the seal.<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-2212\" class=\"elementor-tab-title\" data-tab=\"2\" role=\"button\" aria-controls=\"elementor-tab-content-2212\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Why is pre-oxidation heat treatment necessary before sealing?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-2212\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"2\" role=\"region\" aria-labelledby=\"elementor-tab-title-2212\">Pre-oxidation grows a controlled, dense oxide film (Fe\u2083O\u2084 and FeO) on the plate&#8217;s surface.Molten glass physically dissolves and wets into this oxide layer.Sealing raw,un-oxidized 4J29 metal will result in zero adhesion and immediate leakage.<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-2213\" class=\"elementor-tab-title\" data-tab=\"3\" role=\"button\" aria-controls=\"elementor-tab-content-2213\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">What causes the \"orange peel\" defect during 4J29 stamping?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-2213\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"3\" role=\"region\" aria-labelledby=\"elementor-tab-title-2213\">This surface defect is caused by an overly coarse grain size (lower than ASTM No. 7).If the manufacturing annealing process is poorly controlled,the grains grow too large.When the plate is stamped or deep-drawn,these large grains deform unevenly,creating a rough surface prone to micro-cracking.<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-2214\" class=\"elementor-tab-title\" data-tab=\"4\" role=\"button\" aria-controls=\"elementor-tab-content-2214\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">How does 4J29 plate differ from Invar 36 (4J36) plate?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-2214\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"4\" role=\"region\" aria-labelledby=\"elementor-tab-title-2214\"><p><a href=\"https:\/\/www.kaysuns.com\/invar-36-plate\/\" target=\"_blank\" rel=\"noopener\">Invar 36 (4J36) plate<\/a> is designed for near-zero expansion from room temperature up to 100\u00b0C (used in laser benches or metrology).<\/p><p>4J29 plate has a controlled,matching expansion that climbs steadily up to 450\u00b0C to mirror the expansion curve of industrial glass and ceramics.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<div class=\"elementor-accordion-item\">\n\t\t\t\t\t<div id=\"elementor-tab-title-2215\" class=\"elementor-tab-title\" data-tab=\"5\" role=\"button\" aria-controls=\"elementor-tab-content-2215\" aria-expanded=\"false\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon elementor-accordion-icon-left\" aria-hidden=\"true\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-closed\"><i class=\"fas fa-plus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t<span class=\"elementor-accordion-icon-opened\"><i class=\"fas fa-minus\"><\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-accordion-title\" tabindex=\"0\">Is 4J29 plate easy to machine?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t<div id=\"elementor-tab-content-2215\" class=\"elementor-tab-content elementor-clearfix\" data-tab=\"5\" role=\"region\" aria-labelledby=\"elementor-tab-title-2215\"><strong>No<\/strong>,it is considered gummy and difficult to machine (machinability rating of \u2248 35%).It work-hardens rapidly.Machinists must use sharp carbide tools,slower cutting speeds,high feeds,and continuous lubrication.Sulfur-based oils must be avoided because sulfur ruins subsequent glass seals.<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<script type=\"application\/ld+json\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Can 4J29 plates be used in sub-zero environments?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>Yes.<\\\/strong>High-quality 4J29 plates maintain a stable austenite phase down to -196\\u00b0C.However,the chemical composition must be pure.If nickel falls below 28.5%,the material can transform into martensite at low temperatures,causing permanent volume expansion and rupturing the seal.\"}},{\"@type\":\"Question\",\"name\":\"Why is pre-oxidation heat treatment necessary before sealing?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Pre-oxidation grows a controlled, dense oxide film (Fe\\u2083O\\u2084 and FeO) on the plate&#8217;s surface.Molten glass physically dissolves and wets into this oxide layer.Sealing raw,un-oxidized 4J29 metal will result in zero adhesion and immediate leakage.\"}},{\"@type\":\"Question\",\"name\":\"What causes the \\\"orange peel\\\" defect during 4J29 stamping?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"This surface defect is caused by an overly coarse grain size (lower than ASTM No. 7).If the manufacturing annealing process is poorly controlled,the grains grow too large.When the plate is stamped or deep-drawn,these large grains deform unevenly,creating a rough surface prone to micro-cracking.\"}},{\"@type\":\"Question\",\"name\":\"How does 4J29 plate differ from Invar 36 (4J36) plate?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<p><a href=\\\"https:\\\/\\\/www.kaysuns.com\\\/invar-36-plate\\\/\\\" target=\\\"_blank\\\" rel=\\\"noopener\\\">Invar 36 (4J36) plate<\\\/a> is designed for near-zero expansion from room temperature up to 100\\u00b0C (used in laser benches or metrology).<\\\/p><p>4J29 plate has a controlled,matching expansion that climbs steadily up to 450\\u00b0C to mirror the expansion curve of industrial glass and ceramics.<\\\/p>\"}},{\"@type\":\"Question\",\"name\":\"Is 4J29 plate easy to machine?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"<strong>No<\\\/strong>,it is considered gummy and difficult to machine (machinability rating of \\u2248 35%).It work-hardens rapidly.Machinists must use sharp carbide tools,slower cutting speeds,high feeds,and continuous lubrication.Sulfur-based oils must be avoided because sulfur ruins subsequent glass seals.\"}}]}<\/script>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-a1dbfd6 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"a1dbfd6\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-50 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thicknesses ranging from 0.8 to 105.Please feel free to contact us for a free and quick quote.<\/p>","protected":false},"author":1,"featured_media":62866,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","neve_meta_reading_time":"","_ti_tpc_template_sync":false,"_ti_tpc_template_id":"","footnotes":""},"categories":[478,259],"tags":[],"class_list":["post-62798","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-plates","category-product"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Kovar 4J29 Plate - UNS K94610 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