{"id":73956,"date":"2025-11-25T13:59:55","date_gmt":"2025-11-25T05:59:55","guid":{"rendered":"https:\/\/www.zm3dpowder.com\/?p=73956"},"modified":"2025-12-08T14:42:19","modified_gmt":"2025-12-08T06:42:19","slug":"316-vs-316l-stainless-steel-strength-welding-and-selection","status":"publish","type":"post","link":"https:\/\/www.zm3dpowder.com\/fr\/resistance-de-lacier-inoxydable-316-vs-316l-soudage-et-selection\/","title":{"rendered":"Acier inoxydable 316 Vs 316l : R\u00e9sistance, soudage et s\u00e9lection"},"content":{"rendered":"
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La diff\u00e9rence essentielle entre l'acier inoxydable 316 et 316L est la teneur en carbone. L'acier inoxydable 316 standard a une teneur en carbone maximale de 0,08 %, tandis que le 316L (o\u00f9 \"L\" signifie Low Carbon) repousse cette limite \u00e0 0,03 %.<\/p>\n\n\n\n

Dans les applications pratiques, cette diff\u00e9rence subtile de composition chimique d\u00e9termine directement un principe d'utilisation important : si vous voulez souder des mat\u00e9riaux \u00e9pais et \u00e9viter la corrosion des soudures, vous devez utiliser du 316L.<\/p>\n\n\n\n

Mais les choses ne sont pas si absolues. Si votre sc\u00e9nario d'application implique une charge structurelle \u00e0 des temp\u00e9ratures \u00e9lev\u00e9es, le 316L est en fait le c\u00f4t\u00e9 le plus faible en termes de propri\u00e9t\u00e9s m\u00e9caniques.<\/p>\n\n\n\n

Le 316L est-il donc la \"version am\u00e9lior\u00e9e\" du 316 ? Je ne le pense pas. Bien qu'il r\u00e9solve le probl\u00e8me majeur de la corrosion des soudures, le remplacement aveugle du 316 standard par le 316L peut entra\u00eener de nouveaux risques en termes de limite d'\u00e9lasticit\u00e9 \u00e0 la traction et de stabilit\u00e9 \u00e0 haute temp\u00e9rature.<\/p>\n\n\n\n

Ensuite, je vous parlerai des donn\u00e9es cl\u00e9s, des probl\u00e8mes pratiques de traitement et de fabrication, et d'un secret industriel de \"double certification de marque\" qui peut vous aider \u00e0 \u00e9conomiser le budget du projet.<\/p>\n\n\n\n

\"Diff\u00e9rence<\/figure>\n\n\n\n

<\/span>Chimie et propri\u00e9t\u00e9s m\u00e9caniques<\/span><\/h2>\n\n\n\n

Nous nous r\u00e9f\u00e9rons directement aux dispositions de la norme ASTM A240 :<\/p>\n\n\n\n

Param\u00e8tres techniques<\/td>Acier inoxydable 316 (standard)<\/td>Acier inoxydable 316L (faible teneur en carbone)<\/td>Interpr\u00e9tation technique<\/td><\/tr>
Teneur en carbone (max)<\/td>0.08%<\/td>0.03%<\/td>Les caract\u00e9ristiques du 316L \u00e0 faible teneur en carbone permettent d'\u00e9viter la pr\u00e9cipitation de carbure pendant le soudage.<\/td><\/tr>
Limite d'\u00e9lasticit\u00e9 (Min)<\/td>30 000 psi (205 MPa)<\/td>25 000 psi (170 MPa)<\/td>C'est \u00e9vident et le 316 est plus r\u00e9sistant. Le 316L sacrifie une partie de sa r\u00e9sistance pour la soudabilit\u00e9.<\/td><\/tr>
R\u00e9sistance \u00e0 la traction (Min)<\/td>75 000 psi (515 MPa)<\/td>70 000 psi (485 MPa)<\/td>\u00c0 la charge de rupture ultime, le 316 conserve un l\u00e9ger avantage.<\/td><\/tr>
Temp\u00e9rature de service maximale<\/td>Bon >800\u00b0C<\/td>\u00c9viter >425\u00b0C<\/td>En termes de r\u00e9sistance au fluage \u00e0 haute temp\u00e9rature, le 316 est plus performant.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Mon interpr\u00e9tation professionnelle :
Faites particuli\u00e8rement attention \u00e0 la baisse de la limite d'\u00e9lasticit\u00e9 du 316L. D'apr\u00e8s mon exp\u00e9rience, dans certains projets de pipeline \u00e0 haute pression ou de support structurel, cette diff\u00e9rence de limite d'\u00e9lasticit\u00e9 de 5 000 psi peut faire la diff\u00e9rence entre la r\u00e9ussite et l'\u00e9chec du code ASME pour les appareils \u00e0 pression. Par cons\u00e9quent, ne prenez pas pour acquis de remplacer le 316 par le 316L sur les plans structurels sans recalculer la contrainte.<\/p>\n\n\n\n

<\/span>Soudage et usinage<\/span><\/h2>\n\n\n\n

D'apr\u00e8s notre exp\u00e9rience habituelle avec les usines de transformation, le choix de ces deux qualit\u00e9s a un impact important sur votre processus de production.<\/p>\n\n\n\n

<\/span>Ph\u00e9nom\u00e8ne de \"corrosion intergranulaire\" (d\u00e9gradation des soudures)<\/span><\/h3>\n\n\n\n

Que se passe-t-il avec 316 :<\/strong> Lorsque vous soudez du 316 standard, la zone situ\u00e9e \u00e0 c\u00f4t\u00e9 de la soudure (appel\u00e9e \"zone affect\u00e9e thermiquement\", HAZ) est affect\u00e9e par des temp\u00e9ratures \u00e9lev\u00e9es. Si la teneur en carbone du mat\u00e9riau est \u00e9lev\u00e9e (par exemple, proche de 0,08 %), le carbone \"vole\" le chrome de l'alliage et forme du carbure de chrome. La teneur en chrome de la zone affect\u00e9e thermiquement tombe alors en dessous des 10,5 % requis pour maintenir sa r\u00e9sistance \u00e0 la rouille, ce qui la rend tr\u00e8s sensible \u00e0 la corrosion intergranulaire. Souvent, il faut proc\u00e9der \u00e0 un \"recuit de mise en solution\" (c'est-\u00e0-dire r\u00e9chauffer l'ensemble de la pi\u00e8ce) apr\u00e8s le soudage pour restaurer sa r\u00e9sistance \u00e0 la corrosion - ce processus est co\u00fbteux et prend beaucoup de temps.<\/p>\n\n\n\n

Que se passe-t-il avec le 316L ?<\/strong> Sa faible teneur en carbone (0,03 %) emp\u00eache cette r\u00e9action \u00e0 la source. Vous pouvez souder en toute s\u00e9curit\u00e9 et l'utiliser apr\u00e8s le soudage sans vous soucier de la corrosion.<\/p>\n\n\n\n

<\/span>Usinabilit\u00e9<\/span><\/h3>\n\n\n\n

Bien que le 316L soit plus doux en raison de sa faible teneur en carbone, il est parfois un peu \"collant\" lors de l'usinage, et les copeaux sont relativement longs, ce qui bloque facilement l'outil. Mais l\u00e0 encore, gr\u00e2ce aux progr\u00e8s de la technologie moderne de fusion, pour l'usinage de certaines pi\u00e8ces complexes, le 316L actuel est g\u00e9n\u00e9ralement consid\u00e9r\u00e9 comme plus facile \u00e0 manipuler que le 316 standard, plus dur.<\/p>\n\n\n\n

\"Soudage<\/figure>\n\n\n\n

<\/span>La solution de la \"double certification<\/span><\/h2>\n\n\n\n

\u00c0 ce propos, je dois mentionner un secret semi-ouvert dans l'industrie. En raison de la popularit\u00e9 des technologies modernes de fabrication de l'acier (telles que l'affinage AOD\/VOD), la plupart des aciers inoxydables produits sur le march\u00e9 aujourd'hui r\u00e9pondent en fait \u00e0 la fois \u00e0 la norme de faible teneur en carbone de 316L (C < 0,03%) et \u00e0 l'exigence de haute r\u00e9sistance de 316. Ce r\u00e9sultat est g\u00e9n\u00e9ralement obtenu en ajoutant une quantit\u00e9 infime d'azote \u00e0 l'acier en fusion.<\/p>\n\n\n\n

La prochaine fois que vous recevrez le mat\u00e9riau, vous pourriez tout aussi bien consulter son rapport d'inspection des mat\u00e9riaux (MTR). S'il indique 316\/316L certification double grade (Dual Certified), c'est qu'il s'agit d'un mat\u00e9riau :<\/p>\n\n\n\n

    \n
  • Sa teneur en carbone est inf\u00e9rieure \u00e0 0,03 % (il peut \u00eatre soud\u00e9 en toute s\u00e9curit\u00e9).<\/li>\n\n\n\n
  • Sa limite d'\u00e9lasticit\u00e9 est sup\u00e9rieure \u00e0 30 000 psi (structurellement assez solide).<\/li>\n<\/ul>\n\n\n\n

    Ma suggestion est la suivante : dans le cadre de la gestion des achats et des stocks, unifier autant que possible les achats de mat\u00e9riaux \"316\/316L \u00e0 double certification de qualit\u00e9\". Cela \u00e9limine essentiellement le risque de m\u00e9langer les mat\u00e9riaux \u00e0 la satisfaction du soudeur et de l'ing\u00e9nieur structurel.<\/p>\n\n\n\n

    <\/span>Quand s'en tenir strictement \u00e0 la norme 316 (Non-L)<\/span><\/h2>\n\n\n\n

    Il existe un sc\u00e9nario particulier dans lequel il est dangereux d'utiliser une nuance avec un \"L\". Si votre \u00e9quipement doit fonctionner \u00e0 des temp\u00e9ratures sup\u00e9rieures \u00e0 500\u00b0C (930 \u00b0F), comme dans les syst\u00e8mes \u00e0 vapeur ou les fours industriels, les caract\u00e9ristiques \u00e0 faible teneur en carbone du 316L peuvent r\u00e9duire de mani\u00e8re significative sa r\u00e9sistance \u00e0 la rupture par fluage (c'est-\u00e0-dire la capacit\u00e9 du mat\u00e9riau \u00e0 r\u00e9sister \u00e0 la d\u00e9formation par traction \u00e0 long terme \u00e0 des temp\u00e9ratures \u00e9lev\u00e9es).<\/p>\n\n\n\n

    R\u00e8gle g\u00e9n\u00e9rale :<\/p>\n\n\n\n

      \n
    • Environnement \u00e0 haute temp\u00e9rature (>500\u00b0C) = La norme 316 est pr\u00e9f\u00e9rable (ou 316H, une version \u00e0 haute teneur en carbone).<\/li>\n\n\n\n
    • Environnement humide corrosif (<500\u00b0C) = 316L est pr\u00e9f\u00e9rable.<\/li>\n<\/ul>\n\n\n\n
      \"Acier<\/figure>\n\n\n\n

      <\/span>R\u00e9sum\u00e9 de la s\u00e9lection rapide<\/span><\/h2>\n\n\n\n

      Pour garantir la p\u00e9rennit\u00e9 et la fiabilit\u00e9 de votre projet, gardez \u00e0 l'esprit les points suivants :<\/p>\n\n\n\n

        \n
      • Pour toute application impliquant un soudage, il est pr\u00e9f\u00e9rable d'utiliser le 316L afin d'\u00e9viter l'\u00e9cueil majeur de la corrosion intergranulaire.<\/li>\n\n\n\n
      • Si vous construisez un r\u00e9cipient sous pression, assurez-vous de v\u00e9rifier la limite d'\u00e9lasticit\u00e9 ; \u00e0 moins qu'il ne s'agisse d'un produit certifi\u00e9 \u00e0 double qualit\u00e9, le 316L n'est pas aussi r\u00e9sistant que le 316.<\/li>\n\n\n\n
      • V\u00e9rifiez si le certificat du mat\u00e9riau comporte le logo \"316\/316L\", qui permet d'obtenir \u00e0 la fois une excellente soudabilit\u00e9 et une r\u00e9sistance m\u00e9canique suffisante, ce qui est consid\u00e9r\u00e9 comme une combinaison des avantages des deux c\u00f4t\u00e9s.<\/li>\n<\/ul>\n\n\n\n

        A propos de l'auteur<\/strong>\uff1aJames Wilson<\/strong><\/p>\n\n\n\n

        Je suis ing\u00e9nieur d'application principal et j'ai plus de 20 ans d'exp\u00e9rience dans le domaine de la m\u00e9tallurgie et de la fabrication industrielle. Ayant pass\u00e9 des d\u00e9cennies dans les secteurs de la p\u00e9trochimie et de la marine, j'ai analys\u00e9 d'innombrables d\u00e9faillances d'\u00e9quipements caus\u00e9es par une mauvaise s\u00e9lection des mat\u00e9riaux. Mon objectif est de combler le foss\u00e9 entre les normes ASTM complexes et l'atelier de soudage, en aidant les ing\u00e9nieurs et les fabricants \u00e0 choisir la nuance d'acier exacte n\u00e9cessaire \u00e0 la s\u00e9curit\u00e9 et \u00e0 la long\u00e9vit\u00e9.<\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"themepark_post_bcolor":"#f5f5f5","themepark_post_width":"1022px","themepark_post_img":"","themepark_post_img_po":"left","themepark_post_img_re":false,"themepark_post_img_cover":false,"themepark_post_img_fixed":false,"themepark_post_hide_title":false,"themepark_post_main_b":"","themepark_post_main_p":100,"themepark_paddingblock":false,"_cloudinary_featured_overwrite":false,"footnotes":""},"categories":[58],"tags":[],"class_list":["post-73956","post","type-post","status-publish","format-standard","hentry","category-blogs"],"metadata":{"views":["25"],"rank_math_og_content_image":["a:2:{s:5:\"check\";s:32:\"8d5cb00426fa937632b4be69670f3a04\";s:6:\"images\";a:1:{i:0;s:66:\"https:\/\/res.cloudinary.com\/dsaxk0cy1\/images\/v1\/image-27_741573d54a\/image-27_741573d54a.png?_i=AA\";}}"],"_trp_automatically_translated_slug_ja":["316-vs-316l-\u30b9\u30c6\u30f3\u30ec\u30b9\u92fc\u306e\u5f37\u5ea6\u6eb6\u63a5\u3068\u9078\u629e"],"_trp_automatically_translated_slug_it_IT":["saldatura-e-selezione-della-resistenza-dellacciaio-inossidabile-316-vs-316l"],"_trp_automatically_translated_slug_fr_FR":["resistance-de-lacier-inoxydable-316-vs-316l-soudage-et-selection"],"_trp_automatically_translated_slug_de_DE":["316-vs-316l-edelstahl-festigkeit-schweisen-und-auswahl"],"_trp_automatically_translated_slug_es_ES":["soldadura-y-seleccion-de-la-resistencia-del-acero-inoxidable-316-frente-al-316l"],"_trp_automatically_translated_slug_ar":["\u0644\u062d\u0627\u0645-\u0648\u0627\u062e\u062a\u064a\u0627\u0631-\u0642\u0648\u0629-\u0627\u0644\u0641\u0648\u0644\u0627\u0630-\u0627\u0644\u0645\u0642\u0627\u0648\u0645-\u0644\u0644\u0635\u062f"],"_trp_automatically_translated_slug_ko_KR":["316-\ub300-316l-\uc2a4\ud14c\uc778\ub9ac\uc2a4\uac15-\uac15\ub3c4-\uc6a9\uc811-\ubc0f-\uc120\ud0dd"],"_cld_replacements":["a:1:{s:5:\"https\";a:93:{s:230:\"\"Welding\";s:816:\"\"Welding\";s:219:\"\"Difference\";s:805:\"\"Difference\";s:198:\"\"316\";s:784:\"\"316\";s:87:\"https:\\\/\\\/res.cloudinary.com\\\/dsaxk0cy1\\\/images\\\/v1\\\/site-icon\\\/site-icon.png?_i=AA\";s:76:\"https:\/\/res.cloudinary.com\/dsaxk0cy1\/images\/v1\/site-icon\/site-icon.png?_i=AA\";s:86:\"https:\\\/\\\/res.cloudinary.com\\\/dsaxk0cy1\\\/images\\\/v1\\\/image-15_739886124c\\\/image-15_739886124c.png?_i=AA\";s:96:\"https:\/\/res.cloudinary.com\/dsaxk0cy1\/images\/v1\/image-15_739886124c\/image-15_739886124c.png?_i=AA\";s:86:\"https:\\\/\\\/res.cloudinary.com\\\/dsaxk0cy1\\\/images\\\/v1\\\/image-16_739997bb24\\\/image-16_739997bb24.png?_i=AA\";s:96:\"https:\/\/res.cloudinary.com\/dsaxk0cy1\/images\/v1\/image-16_739997bb24\/image-16_739997bb24.png?_i=AA\";s:86:\"https:\\\/\\\/res.cloudinary.com\\\/dsaxk0cy1\\\/images\\\/v1\\\/image-27_741573d54a\\\/image-27_741573d54a.png?_i=AA\";s:96:\"https:\/\/res.cloudinary.com\/dsaxk0cy1\/images\/v1\/image-27_741573d54a\/image-27_741573d54a.png?_i=AA\";s:83:\"https:\\\/\\\/res.cloudinary.com\\\/dsaxk0cy1\\\/images\\\/v1\\\/6-M-1\\\/6-M-1.png?_i=AA\";s:68:\"https:\/\/res.cloudinary.com\/dsaxk0cy1\/images\/v1\/6-M-1\/6-M-1.png?_i=AA\";s:82:\"https:\\\/\\\/res.cloudinary.com\\\/dsaxk0cy1\\\/images\\\/v1\\\/BOT1\\\/BOT1.png?_i=AA\";s:66:\"https:\/\/res.cloudinary.com\/dsaxk0cy1\/images\/v1\/BOT1\/BOT1.png?_i=AA\";s:82:\"https:\\\/\\\/res.cloudinary.com\\\/dsaxk0cy1\\\/images\\\/v1\\\/site-icon\\\/site-icon.png?_i=AA&\";s:77:\"https:\/\/res.cloudinary.com\/dsaxk0cy1\/images\/v1\/site-icon\/site-icon.png?_i=AA&\";s:81:\"https:\\\/\\\/res.cloudinary.com\\\/dsaxk0cy1\\\/images\\\/v1\\\/image-15_739886124c\\\/image-15_739886124c.png?_i=AA&\";s:97:\"https:\/\/res.cloudinary.com\/dsaxk0cy1\/images\/v1\/image-15_739886124c\/image-15_739886124c.png?_i=AA&\";s:81:\"https:\\\/\\\/res.cloudinary.com\\\/dsaxk0cy1\\\/images\\\/v1\\\/image-16_739997bb24\\\/image-16_739997bb24.png?_i=AA&\";s:97:\"https:\/\/res.cloudinary.com\/dsaxk0cy1\/images\/v1\/image-16_739997bb24\/image-16_739997bb24.png?_i=AA&\";s:81:\"https:\\\/\\\/res.cloudinary.com\\\/dsaxk0cy1\\\/images\\\/v1\\\/image-27_741573d54a\\\/image-27_741573d54a.png?_i=AA&\";s:97:\"https:\/\/res.cloudinary.com\/dsaxk0cy1\/images\/v1\/image-27_741573d54a\/image-27_741573d54a.png?_i=AA&\";s:81:\"https:\\\/\\\/res.cloudinary.com\\\/dsaxk0cy1\\\/images\\\/v1\\\/site-icon\\\/site-icon.png?_i=AA\";s:76:\"https:\/\/res.cloudinary.com\/dsaxk0cy1\/images\/v1\/site-icon\/site-icon.png?_i=AA\";s:80:\"https:\/\/res.cloudinary.com\/dsaxk0cy1\/images\/v1\/site-icon\/site-icon.png?_i=AA\";s:76:\"https:\/\/res.cloudinary.com\/dsaxk0cy1\/images\/v1\/site-icon\/site-icon.png?_i=AA\";s:80:\"https:\\\/\\\/res.cloudinary.com\\\/dsaxk0cy1\\\/images\\\/v1\\\/image-15_739886124c\\\/image-15_739886124c.png?_i=AA\";s:96:\"https:\/\/res.cloudinary.com\/dsaxk0cy1\/images\/v1\/image-15_739886124c\/image-1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