{"id":6174,"date":"2020-06-23T02:59:39","date_gmt":"2020-06-23T02:59:39","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=6174"},"modified":"2026-01-27T09:28:45","modified_gmt":"2026-01-27T09:28:45","slug":"o-que-e-pren","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/pt\/blog\/what-is-pren\/","title":{"rendered":"O que \u00e9 PREN (n\u00famero equivalente de resist\u00eancia de corros\u00e3o)"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"6174\" class=\"elementor elementor-6174\" data-elementor-post-type=\"blog\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4c6b3e0 e-flex e-con-boxed e-con e-parent\" data-id=\"4c6b3e0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-9f0fe05 e-con-full e-flex e-con e-child\" data-id=\"9f0fe05\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-277057a elementor-widget elementor-widget-heading\" data-id=\"277057a\" 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\">What is PREN<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-001ac65 elementor-widget elementor-widget-text-editor\" data-id=\"001ac65\" 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\tPitting Resistance Equivalent Number, abbreviated as PREN, is a set of algorithms calculated on the basis of the mass fraction of certain elements in the metal. The value is often used in the evaluation method for comparison of pitting corrosion resistance.\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-6e586ea elementor-widget elementor-widget-text-editor\" data-id=\"6e586ea\" 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>There are several Pitting Resistance Equivalent Number formulas in different versions of the data, but generally speaking, this formula is the most widely used:<\/p>\n<p>\n<\/p>\n<p><strong>PREN = 1*Cr% + 3.3 * Mo% + 16 * N%<\/strong>.<\/p>\n<p>\n<\/p>\n<p>There is a version of the pitting corrosion resistance equivalent value Pitting Resistance Equivalent Number formula is more accurate: <em>There are a few stainless steels which add tungsten (W), for thosethe following formula is used PREN = 1 x Cr%<\/em> + 3.3 ( Mo<em>%<\/em> + 0.5 x W<em>%<\/em> ) + 16 x N%<\/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-11d4784 elementor-widget elementor-widget-image\" data-id=\"11d4784\" 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=\"488\" height=\"281\" src=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/06\/whats-PREN.jpg\" class=\"attachment-large size-large wp-image-6175\" alt=\"whats-PREN\" srcset=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/06\/whats-PREN.jpg 488w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/06\/whats-PREN-300x173.jpg 300w\" sizes=\"(max-width: 488px) 100vw, 488px\" \/>\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>\n\t\t<div class=\"elementor-element elementor-element-95b92ed e-con-full e-flex e-con e-child\" data-id=\"95b92ed\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-18fc3d0 elementor-widget elementor-widget-html\" data-id=\"18fc3d0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"pren-wrapper\" style=\"display: flex; justify-content: center; padding: 20px;\">\n    <div id=\"pren-calculator\" style=\"background: #ffffff; padding: 30px; border: 1px solid #ddd; border-radius: 12px; max-width: 450px; width: 100%; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; box-shadow: 0 4px 15px rgba(0,0,0,0.1); text-align: center;\">\n        \n        <h3 style=\"margin-bottom: 25px; color: #333; font-size: 22px;\">PREN Calculator<\/h3>\n        \n        <!-- Input Fields -->\n        <div style=\"margin-bottom: 15px; text-align: left;\">\n            <label style=\"font-weight: 600; color: #555;\">Chromium - Cr (%)<\/label>\n            <input type=\"text\" id=\"cr\" placeholder=\"0.00\" oninput=\"cleanAndValidate(this)\" style=\"width: 100%; padding: 10px; border: 1px solid #ccc; border-radius: 6px; margin-top: 5px;\">\n        <\/div>\n        \n        <div style=\"margin-bottom: 15px; text-align: left;\">\n            <label style=\"font-weight: 600; color: #555;\">Molybdenum - Mo (%)<\/label>\n            <input type=\"text\" id=\"mo\" placeholder=\"0.00\" oninput=\"cleanAndValidate(this)\" style=\"width: 100%; padding: 10px; border: 1px solid #ccc; border-radius: 6px; margin-top: 5px;\">\n        <\/div>\n\n        <div style=\"margin-bottom: 15px; text-align: left;\">\n            <label style=\"font-weight: 600; color: #555;\">Tungsten - W (%)<\/label>\n            <input type=\"text\" id=\"w\" placeholder=\"0.00\" oninput=\"cleanAndValidate(this)\" style=\"width: 100%; padding: 10px; border: 1px solid #ccc; border-radius: 6px; margin-top: 5px;\">\n        <\/div>\n        \n        <div style=\"margin-bottom: 25px; text-align: left;\">\n            <label style=\"font-weight: 600; color: #555;\">Nitrogen - N (%)<\/label>\n            <input type=\"text\" id=\"n\" placeholder=\"0.00\" oninput=\"cleanAndValidate(this)\" style=\"width: 100%; padding: 10px; border: 1px solid #ccc; border-radius: 6px; margin-top: 5px;\">\n        <\/div>\n\n        <button onclick=\"calculatePREN()\" style=\"background: #2271b1; color: white; border: none; padding: 12px 25px; border-radius: 6px; cursor: pointer; width: 100%; font-size: 16px; font-weight: bold;\">Calculate Now<\/button>\n\n        <!-- Result Display -->\n        <div style=\"margin-top: 25px; padding-top: 20px; border-top: 2px solid #eee;\">\n            <div id=\"error-msg\" style=\"color: #d63638; font-size: 13px; margin-bottom: 10px; min-height: 20px; font-weight: 500;\"><\/div>\n            <div style=\"color: #666; font-size: 14px; margin-bottom: 5px;\">Resulting PREN Value:<\/div>\n            <div id=\"pren-result\" style=\"font-size: 32px; color: #d63638; font-weight: 800;\">0.00<\/div>\n        <\/div>\n\n        <p style=\"font-size: 11px; color: #999; margin-top: 20px; font-style: italic;\">\n            Formula: Cr + 3.3 * (Mo + 0.5 * W) + 16 * N\n        <\/p>\n    <\/div>\n<\/div>\n\n<script>\n\/\/ \u5b9e\u65f6\u6e05\u6d17\u8f93\u5165\uff1a\u7981\u6b62\u8d1f\u6570\u3001\u5b57\u6bcd\u3001\u7279\u6b8a\u5b57\u7b26\uff0c\u5141\u8bb8\u5c0f\u6570\u70b9\nfunction cleanAndValidate(input) {\n    \/\/ \u53ea\u4fdd\u7559\u6570\u5b57\u548c\u5c0f\u6570\u70b9\n    let value = input.value.replace(\/[^0-9.]\/g, '');\n    \n    \/\/ \u9632\u6b62\u8f93\u5165\u591a\u4e2a\u5c0f\u6570\u70b9\n    const dotCount = (value.match(\/\\.\/g) || []).length;\n    if (dotCount > 1) {\n        value = value.slice(0, value.lastIndexOf('.'));\n    }\n\n    \/\/ \u9650\u5236\u5355\u9879\u4e0d\u80fd\u8d85\u8fc7 100\n    if (parseFloat(value) > 100) {\n        value = \"100\";\n    }\n    \n    input.value = value;\n}\n\nfunction calculatePREN() {\n    const errorBox = document.getElementById('error-msg');\n    const resultBox = document.getElementById('pren-result');\n    \n    \/\/ \u8f6c\u6362\u4e3a\u6d6e\u70b9\u6570\n    const cr = parseFloat(document.getElementById('cr').value) || 0;\n    const mo = parseFloat(document.getElementById('mo').value) || 0;\n    const w = parseFloat(document.getElementById('w').value) || 0;\n    const n = parseFloat(document.getElementById('n').value) || 0;\n\n    errorBox.innerText = \"\";\n\n    \/\/ \u6821\u9a8c\u6240\u6709\u6210\u5206\u603b\u548c\n    const total = cr + mo + w + n;\n    if (total > 100) {\n        errorBox.innerText = \"Error: Total composition (\" + total.toFixed(2) + \"%) exceeds 100%!\";\n        resultBox.innerText = \"0.00\";\n        return;\n    }\n\n    \/\/ \u8ba1\u7b97 PREN (\u542b\u94a8\u516c\u5f0f)\n    const pren = cr + (3.3 * (mo + 0.5 * w)) + (16 * n);\n    resultBox.innerText = pren.toFixed(2);\n}\n<\/script>\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-d6a6aa4 e-flex e-con-boxed e-con e-parent\" data-id=\"d6a6aa4\" 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-615dd0f elementor-widget elementor-widget-text-editor\" data-id=\"615dd0f\" 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>Metals with higher PREN values appear to be more resistant to localized corrosion than metals with lower Pitting Resistance Equivalent Number values.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p>In general, metals with a PREN value greater than 32 can be used to resist seawater pitting corrosion. For safety and stability, materials with a PREN value greater than 40 such as S31254 super <a href=\"https:\/\/www.kaysuns.com\/stainless-steel-pipes\/\" target=\"_blank\">stainless steel pipe<\/a> and <a href=\"https:\/\/www.kaysuns.com\/duplex-2205-stainless-steel-pipe\/\" target=\"_blank\">2507 super duplex pipe<\/a> are often used in the seawater environment and offshore service.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p><strong>Anti-pitting measurement method:<\/strong><\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p>ASTM G48 standard specifies the precise pitting corrosion test procedure.<\/p>\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-b9c556d e-flex e-con-boxed e-con e-parent\" data-id=\"b9c556d\" 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-d430189 elementor-widget elementor-widget-heading\" data-id=\"d430189\" 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\">The PREN Values of Common Special Metals Are as Follows:<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-662c6cc elementor-widget elementor-widget-text-editor\" data-id=\"662c6cc\" 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\tTungsten (W) is known to have an effect on the piting resistance and for some grades a modified formula is used: PREN = Cr+ 3.3(Mo +0.5W)+ 16N\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-04a5c7a elementor-widget elementor-widget-image\" data-id=\"04a5c7a\" 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\t<a href=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/06\/Pitting-Resistance-Equivalent-Number-PREN-values-of-common-special-metals.jpg\" data-elementor-open-lightbox=\"yes\" data-elementor-lightbox-title=\"Pitting-Resistance-Equivalent-Number-PREN-values-of-common-special-metals\" data-e-action-hash=\"#elementor-action%3Aaction%3Dlightbox%26settings%3DeyJpZCI6NjE3NiwidXJsIjoiaHR0cHM6XC9cL3d3dy5rYXlzdW5zLmNvbVwvd3AtY29udGVudFwvdXBsb2Fkc1wvMjAyMFwvMDZcL1BpdHRpbmctUmVzaXN0YW5jZS1FcXVpdmFsZW50LU51bWJlci1QUkVOLXZhbHVlcy1vZi1jb21tb24tc3BlY2lhbC1tZXRhbHMuanBnIn0%3D\" target=\"_blank\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"564\" height=\"328\" src=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/06\/Pitting-Resistance-Equivalent-Number-PREN-values-of-common-special-metals.jpg\" class=\"attachment-large size-large wp-image-6176\" alt=\"Pitting-Resistance-Equivalent-Number-PREN-values-of-common-special-metals\" srcset=\"https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/06\/Pitting-Resistance-Equivalent-Number-PREN-values-of-common-special-metals.jpg 564w, https:\/\/www.kaysuns.com\/wp-content\/uploads\/2020\/06\/Pitting-Resistance-Equivalent-Number-PREN-values-of-common-special-metals-300x174.jpg 300w\" sizes=\"(max-width: 564px) 100vw, 564px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\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-9e4ee1e elementor-widget elementor-widget-text-editor\" data-id=\"9e4ee1e\" 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\tPREN values for Stainless Steel and Duplex Steel\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-aa73c70 elementor-widget elementor-widget-text-editor\" data-id=\"aa73c70\" 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\tKaysuns provide <a href=\"https:\/\/www.kaysuns.com\/\" target=\"_blank\">super duplex pipe and fittings<\/a> with Pitting Resistance Equivalent Number&gt;=40 to match the requirements of shipping building and seawater equipments.\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<\/div>\n\t\t","protected":false},"featured_media":6175,"template":"","categories":[186],"tags":[],"class_list":["post-6174","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 - 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