{"id":6251,"date":"2020-07-24T07:30:16","date_gmt":"2020-07-24T07:30:16","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=6251"},"modified":"2026-05-20T06:13:32","modified_gmt":"2026-05-20T06:13:32","slug":"o-que-e-904l","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/pt\/blog\/what-is-904l\/","title":{"rendered":"O que \u00e9 904L?"},"content":{"rendered":"<h2 class=\"wp-block-heading\"><strong>Introdu\u00e7\u00e3o do a\u00e7o inoxid\u00e1vel 904L<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.kaysuns.com\/pt\/blog\/tubo-de-aco-inoxidavel-904l\/\" target=\"_blank\" rel=\"noreferrer noopener\">Tubo de a\u00e7o inoxid\u00e1vel 904L<\/a> is a low carbon high nickel, high <a href=\"https:\/\/www.kaysuns.com\/pt\/papel-do-molibdenio-em-tubos-e-conexoes-de-aco-inoxidavel\/\" target=\"_blank\">molibd\u00eanio<\/a> austenitic stainless steel pipe. Excellent corrosion resistance. It has good corrosion resistance in non-oxidizing acids such as sulfuric acid, acetic acid, formic acid, and phosphoric acid. It has good pitting corrosion resistance in neutral chloride-containing media and has good resistance Crevice corrosion and stress corrosion resistance.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"396\" height=\"377\" src=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/07\/904L-stainless-steel.jpg\" alt=\"A\u00e7o inoxid\u00e1vel 904L\" class=\"wp-image-6252\" srcset=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/07\/904L-stainless-steel.jpg 396w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/07\/904L-stainless-steel-300x286.jpg 300w\" sizes=\"(max-width: 396px) 100vw, 396px\" \/><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">\u00c9 adequado para v\u00e1rias concentra\u00e7\u00f5es de \u00e1cido sulf\u00farico abaixo de 70 \u00b0 C e tem boa resist\u00eancia \u00e0 corros\u00e3o em \u00e1cido ac\u00e9tico em qualquer concentra\u00e7\u00e3o e em qualquer temperatura e \u00e1cido misto de \u00e1cido f\u00f3rmico e \u00e1cido ac\u00e9tico sob press\u00e3o normal.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Notas<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Padr\u00e3o americano: UNS N08904<\/strong><\/li>\n\n\n\n<li><strong>Padr\u00e3o europeu: 1,4539<\/strong><\/li>\n\n\n\n<li><strong>Padr\u00e3o C: 00Cr20Ni25Mo4.5Cu<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<table width=\"80%\" border=\"1\" align=\"center\" cellpadding=\"1\" cellspacing=\"1\">\n  <tr>\n    <td colspan=\"10\" align=\"center\"><h3 align=\"center\"><strong>Composi\u00e7\u00e3o Qu\u00edmica de 904L<\/strong><\/h3><\/td>\n  <\/tr>\n  <tr>\n    <td align=\"center\"><p>S\u2264<\/p><\/td>\n    <td align=\"center\"><p>Si &lt;\u2264<\/p><\/td>\n    <td align=\"center\"><p>Mn\u2264<\/p><\/td>\n    <td align=\"center\"><p>P\u2264<\/p><\/td>\n    <td align=\"center\"><p>S\u2264 <\/p><\/td>\n    <td align=\"center\"><p>Cr\u2265<\/p><\/td>\n    <td align=\"center\"><p>Ni\u2265<\/p><\/td>\n    <td align=\"center\"><p>Mo\u2265 <\/p><\/td>\n    <td align=\"center\"><p>Cu\u2264<\/p><\/td>\n    <td align=\"center\"><p>Fe <\/p><\/td>\n  <\/tr>\n  <tr>\n    <td align=\"center\"><p>0. 02 <\/p><\/td>\n    <td align=\"center\"><p>1. 00 <\/p><\/td>\n    <td align=\"center\"><p>2. 00 <\/p><\/td>\n    <td align=\"center\"><p>0. 045 <\/p><\/td>\n    <td align=\"center\"><p>0. 035 <\/p><\/td>\n    <td align=\"center\"><p>19.00-23.00 <\/p><\/td>\n    <td align=\"center\"><p>23.00-23.00 <\/p><\/td>\n    <td align=\"center\"><p>4. 00-5. 00 <\/p><\/td>\n    <td align=\"center\"><p>1. 00-2. 00 <\/p><\/td>\n    <td align=\"center\"><p>o resto<\/p><\/td>\n  <\/tr>\n<\/table>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Desempenho de processamento de 904L<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">904L tem boa trabalhabilidade e soldabilidade.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trabalhabilidade: A temperatura m\u00e1xima de aquecimento durante a forja a quente pode atingir 1180 graus Celsius, e a temperatura m\u00ednima de parada da forja n\u00e3o \u00e9 inferior a 900 graus Celsius. A conforma\u00e7\u00e3o a quente deste a\u00e7o pode ser realizada a 1000-1150 graus Celsius. O processo de tratamento t\u00e9rmico do a\u00e7o \u00e9 de 1100-1150 graus Celsius, e \u00e9 rapidamente resfriado ap\u00f3s o aquecimento.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Soldabilidade: Embora este a\u00e7o possa ser soldado por um processo geral de soldagem, o m\u00e9todo de soldagem mais apropriado \u00e9 a soldagem a arco manual e a soldagem a arco de arg\u00f4nio-tungst\u00eanio. Quando a soldagem a arco manual \u00e9 usada para soldar placas n\u00e3o maiores que 6 mm, o di\u00e2metro do eletrodo n\u00e3o \u00e9 maior que 2,5 mm; quando a espessura da placa \u00e9 maior que 6 mm, o di\u00e2metro do eletrodo \u00e9 menor que 3,2 mm.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quando o tratamento t\u00e9rmico \u00e9 necess\u00e1rio ap\u00f3s a soldagem, ele pode ser aquecido a 1075-1125 graus Celsius e ent\u00e3o resfriado rapidamente para tratamento. Ao usar a soldagem a arco de tungst\u00eanio e arg\u00f4nio, o metal de adi\u00e7\u00e3o pode usar o mesmo eletrodo de material e a solda deve ser decapada e passivada ap\u00f3s a soldagem.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Microestrutura<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">904L \u00e9 uma estrutura totalmente austen\u00edtica. Comparado com o a\u00e7o inoxid\u00e1vel austen\u00edtico geral com alto teor de molibd\u00eanio, o 904L n\u00e3o \u00e9 sens\u00edvel \u00e0 precipita\u00e7\u00e3o de ferrita e fase \u03b1.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Propriedades f\u00edsicas do a\u00e7o inoxid\u00e1vel 904L<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Densidade: 8,24g \/ cm3<\/li>\n\n\n\n<li>Resist\u00eancia \u00e0 tra\u00e7\u00e3o: \u2265520MPa<\/li>\n\n\n\n<li>For\u00e7a de rendimento: \u2265216MPa<\/li>\n\n\n\n<li>Alongamento: \u226535%<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Resist\u00eancia \u00e0 corros\u00e3o de a\u00e7o inoxid\u00e1vel 904L<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Como o teor de carbono do 904L \u00e9 muito baixo (m\u00e1ximo de 0,020%), n\u00e3o haver\u00e1 precipita\u00e7\u00e3o de carboneto no caso de tratamento t\u00e9rmico geral e soldagem. Isso elimina o risco de <a href=\"https:\/\/www.kaysuns.com\/pt\/perigo-oculto-da-corrosao-intergranular\/\" target=\"_blank\">corros\u00e3o intergranular<\/a> que ocorre ap\u00f3s o tratamento t\u00e9rmico geral e a soldagem. Devido ao alto teor de cromo, n\u00edquel e molibd\u00eanio e \u00e0 adi\u00e7\u00e3o de cobre, o 904L pode ser passivado mesmo em ambientes redutores, como o \u00e1cido sulf\u00farico e o \u00e1cido f\u00f3rmico.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O alto teor de n\u00edquel faz com que tenha menor taxa de corros\u00e3o no estado ativo. Em \u00e1cido sulf\u00farico puro na faixa de concentra\u00e7\u00e3o de 0 ~ 98%, a temperatura de opera\u00e7\u00e3o de 904L pode chegar a 40 graus Celsius. A resist\u00eancia \u00e0 corros\u00e3o do \u00e1cido fosf\u00f3rico puro na faixa de concentra\u00e7\u00e3o de 0-85% \u00e9 muito boa. No \u00e1cido fosf\u00f3rico industrial produzido pelo processo \u00famido, as impurezas t\u00eam forte influ\u00eancia na resist\u00eancia \u00e0 corros\u00e3o. Entre todos os tipos de \u00e1cido fosf\u00f3rico, o 904L tem melhor resist\u00eancia \u00e0 corros\u00e3o do que o a\u00e7o inoxid\u00e1vel comum. Entre o \u00e1cido n\u00edtrico fortemente oxidante, o 904L tem menor resist\u00eancia \u00e0 corros\u00e3o do que o a\u00e7o de alta liga sem molibd\u00eanio. No \u00e1cido clor\u00eddrico, o uso de 904L \u00e9 limitado a uma concentra\u00e7\u00e3o mais baixa de 1-2%. Nesta faixa de concentra\u00e7\u00e3o. A resist\u00eancia \u00e0 corros\u00e3o do 904L \u00e9 melhor do que a do a\u00e7o inoxid\u00e1vel convencional.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O 904L tem alta resist\u00eancia \u00e0 corros\u00e3o por pite. Sua resist\u00eancia \u00e0 corros\u00e3o em fendas em solu\u00e7\u00e3o de cloreto tamb\u00e9m \u00e9 muito boa. O alto teor de n\u00edquel do 904L reduz a taxa de corros\u00e3o em cavidades e fendas. O a\u00e7o inoxid\u00e1vel austen\u00edtico comum pode ser sens\u00edvel \u00e0 corros\u00e3o sob tens\u00e3o em um ambiente rico em cloreto quando a temperatura \u00e9 superior a 60 graus Celsius. Ao aumentar o teor de n\u00edquel do a\u00e7o inoxid\u00e1vel, essa sensibilidade pode ser reduzida. Devido ao alto teor de n\u00edquel, o 904L tem alta resist\u00eancia \u00e0 <a href=\"https:\/\/www.kaysuns.com\/pt\/rachaduras-por-corrosao-sob-tensao-em-aco-inoxidavel\/\" target=\"_blank\">rachaduras por corros\u00e3o sob tens\u00e3o<\/a> em solu\u00e7\u00f5es de cloreto, solu\u00e7\u00f5es concentradas de hidr\u00f3xido e ambientes ricos em sulfeto de hidrog\u00eanio.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>904L pode ser aplicado em muitos campos industriais:<\/strong><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Petr\u00f3leo e equipamentos petroqu\u00edmicos, como reatores em equipamentos petroqu\u00edmicos, etc.<\/li>\n\n\n\n<li>Equipamento de armazenamento e transporte de \u00e1cido sulf\u00farico, etc.<\/li>\n\n\n\n<li>Dispositivo de dessulfuriza\u00e7\u00e3o de g\u00e1s de combust\u00e3o de usina, as principais pe\u00e7as de uso s\u00e3o: o corpo da torre da torre de absor\u00e7\u00e3o, combust\u00e3o, placa de port\u00e3o, pe\u00e7as internas, sistema de pulveriza\u00e7\u00e3o, etc.<\/li>\n\n\n\n<li>O purificador e o ventilador no sistema de tratamento de \u00e1cidos org\u00e2nicos.<\/li>\n\n\n\n<li>Dispositivo de tratamento de \u00e1gua do mar, trocador de calor de \u00e1gua do mar.<\/li>\n\n\n\n<li>Equipamentos para a ind\u00fastria de papel<\/li>\n\n\n\n<li>\u00c1cido sulf\u00farico, equipamento de \u00e1cido n\u00edtrico, fabrica\u00e7\u00e3o de \u00e1cido, ind\u00fastria farmac\u00eautica e outros equipamentos qu\u00edmicos, vasos de press\u00e3o.<\/li>\n\n\n\n<li>Equipamentos aliment\u00edcios, centr\u00edfugas, reatores em f\u00e1bricas farmac\u00eauticas, etc. Tanque de molho de soja, vinho para cozinhar, tanque de sal e outras m\u00e1quinas aliment\u00edcias.<\/li>\n\n\n\n<li>Equipamentos e pe\u00e7as fortemente corrosivas para diluir o \u00e1cido sulf\u00farico.<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\">Postado por KAYSUNS, o <a href=\"https:\/\/www.kaysuns.com\/pt\/\" target=\"_blank\">fornecedor de tubos e acess\u00f3rios de a\u00e7o inoxid\u00e1vel<\/a><\/p>","protected":false},"featured_media":6252,"template":"","categories":[186],"tags":[],"class_list":["post-6251","blog","type-blog","status-publish","has-post-thumbnail","hentry","category-stainless-steel-knowledge"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Is 904L? - Stainless Steel Pipe and Fittings | KAYSUNS<\/title>\n<meta name=\"description\" content=\"904L is a low carbon high nickel, high molybdenum austenitic stainless steel. chemical composition, processing performance, physical properties...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.kaysuns.com\/pt\/blog\/o-que-e-904l\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is 904L? - Stainless Steel Pipe and Fittings | KAYSUNS\" \/>\n<meta property=\"og:description\" content=\"904L is a low carbon high nickel, high molybdenum austenitic stainless steel. chemical composition, processing performance, physical properties...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.kaysuns.com\/pt\/blog\/o-que-e-904l\/\" \/>\n<meta property=\"og:site_name\" content=\"Stainless Steel Pipe and Fittings | KAYSUNS\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-20T06:13:32+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/07\/904L-stainless-steel.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"396\" \/>\n\t<meta property=\"og:image:height\" content=\"377\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. tempo de leitura\" \/>\n\t<meta name=\"twitter:data1\" content=\"4 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.kaysuns.com\\\/blog\\\/what-is-904l\\\/\",\"url\":\"https:\\\/\\\/www.kaysuns.com\\\/blog\\\/what-is-904l\\\/\",\"name\":\"What Is 904L? 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