{"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":"quest-ce-que-la-prenatalite","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/fr\/blog\/quest-ce-que-la-prenatalite\/","title":{"rendered":"Qu&#039;est-ce que le PREN (nombre \u00e9quivalent de r\u00e9sistance aux piq\u00fbres)"},"content":{"rendered":"<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\">\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\">\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-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\">Qu&#039;est-ce que le 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-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tL'indice \u00e9quivalent de r\u00e9sistance \u00e0 la corrosion par piq\u00fbre, abr\u00e9g\u00e9 en PREN, est un ensemble d'algorithmes calcul\u00e9s sur la base de la fraction de masse de certains \u00e9l\u00e9ments dans le m\u00e9tal. La valeur est souvent utilis\u00e9e dans la m\u00e9thode d'\u00e9valuation pour comparer la r\u00e9sistance \u00e0 la corrosion par piq\u00fbre.\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-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>Il existe plusieurs formules de nombre d&#039;\u00e9quivalents de r\u00e9sistance aux piq\u00fbres dans diff\u00e9rentes versions des donn\u00e9es, mais de mani\u00e8re g\u00e9n\u00e9rale, cette formule est la plus largement utilis\u00e9e\u00a0:<\/p>\n<p>\n<\/p>\n<p><strong>PREN = 1*Cr% + 3,3 * Mo% + 16 * N%<\/strong>.<\/p>\n<p>\n<\/p>\n<p>Il existe une version de la valeur \u00e9quivalente de la r\u00e9sistance \u00e0 la corrosion par piq\u00fbres La formule du nombre \u00e9quivalent de r\u00e9sistance aux piq\u00fbres est plus pr\u00e9cise\u00a0: <em>Il existe quelques aciers inoxydables auxquels on ajoute du tungst\u00e8ne (W), pour lesquels on utilise la formule suivante PREN = 1 x Cr%<\/em> + 3,3 ( Mo<em>%<\/em> + 0,5 x L<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-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=\"quoi-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\">\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-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;\">Calculateur PREN<\/h3>\n        \n        <!-- Input Fields -->\n        <div style=\"margin-bottom: 15px; text-align: left;\">\n            <label style=\"font-weight: 600; color: #555;\">Chrome - 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;\">Molybd\u00e8ne - 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;\">Tungst\u00e8ne - 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;\">Azote - 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;\">Calculer maintenant<\/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;\">Valeur PREN r\u00e9sultante :<\/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            Formule : 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\">\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-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>Les m\u00e9taux avec des valeurs PREN plus \u00e9lev\u00e9es semblent \u00eatre plus r\u00e9sistants \u00e0 la corrosion localis\u00e9e que les m\u00e9taux avec des valeurs d&#039;\u00e9quivalent de r\u00e9sistance aux piq\u00fbres plus faibles.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p>En g\u00e9n\u00e9ral, les m\u00e9taux avec une valeur PREN sup\u00e9rieure \u00e0 32 peuvent \u00eatre utilis\u00e9s pour r\u00e9sister \u00e0 la corrosion par piq\u00fbres d&#039;eau de mer. Pour la s\u00e9curit\u00e9 et la stabilit\u00e9, les mat\u00e9riaux avec une valeur PREN sup\u00e9rieure \u00e0 40 tels que S31254 super <a href=\"https:\/\/www.kaysuns.com\/fr\/tuyaux-en-acier-inoxydable\/\" target=\"_blank\">tuyau en acier inoxydable<\/a> et <a href=\"https:\/\/www.kaysuns.com\/fr\/duplex-2205-stainless-steel-pipe\/\" target=\"_blank\">Tuyau super duplex 2507<\/a> sont souvent utilis\u00e9s dans l&#039;environnement d&#039;eau de mer et le service offshore.<\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p><strong>M\u00e9thode de mesure anti-piq\u00fbres\u00a0:<\/strong><\/p>\n<p><!-- \/wp:paragraph --><!-- wp:paragraph --><\/p>\n<p>La norme ASTM G48 sp\u00e9cifie la proc\u00e9dure pr\u00e9cise de test de corrosion par piq\u00fbres.<\/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\">\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-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\">Les valeurs PREN des m\u00e9taux sp\u00e9ciaux courants sont les suivantes :<\/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-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tLe tungst\u00e8ne (W) est connu pour avoir un effet sur la r\u00e9sistance aux piq\u00fbres et pour certaines nuances, une formule modifi\u00e9e est utilis\u00e9e\u00a0: 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-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=\"Pitch-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-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\tValeurs PREN pour l&#039;acier inoxydable et l&#039;acier duplex\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-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 fournit <a href=\"https:\/\/www.kaysuns.com\/fr\/\" target=\"_blank\">tuyaux et raccords super duplex<\/a> avec un nombre \u00e9quivalent de r\u00e9sistance aux piq\u00fbres&gt;=40 pour r\u00e9pondre aux exigences des \u00e9quipements de construction et d&#039;eau de mer d&#039;exp\u00e9dition.\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>","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 v26.6 - 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