{"id":6214,"date":"2020-07-08T08:14:33","date_gmt":"2020-07-08T08:14:33","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=6214"},"modified":"2025-07-01T06:30:47","modified_gmt":"2025-07-01T06:30:47","slug":"le-role-du-chrome-dans-lacier-inoxydable","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/fr\/blog\/le-role-du-chrome-dans-lacier-inoxydable\/","title":{"rendered":"Le r\u00f4le du chrome dans l'acier inoxydable"},"content":{"rendered":"

Le chrome est l'\u00e9l\u00e9ment d'alliage le plus important dans l'acier inoxydable aust\u00e9nitique. <\/h2>\n\n\n\n

Quel est le r\u00f4le du Chrome dans l'acier inoxydable ? La r\u00e9sistance \u00e0 la corrosion de l'acier inoxydable aust\u00e9nitique est principalement due au fait que le chrome dans l'acier inoxydable favorise la passivation de l'acier et maintient l'acier dans un \u00e9tat stable et passif sous l'action du mat\u00e9riau de rencontre.<\/p>\n\n\n\n

L'effet du chrome dans la structure en acier inoxydable<\/strong><\/h3>\n\n\n\n

Dans l'acier inoxydable aust\u00e9nitique, le chrome est un \u00e9l\u00e9ment qui forme et stabilise fortement la ferrite, r\u00e9tr\u00e9cissant la zone d'aust\u00e9nite, \u00e0 mesure que la teneur de l'acier augmente, la ferrite (\u03b4) peut appara\u00eetre dans l'acier inoxydable aust\u00e9nitique Organisation, la recherche montre que dans le chrome-nickel acier inoxydable aust\u00e9nitique, lorsque la teneur en carbone est de 0,1% et la teneur en chrome est de 18%, afin d'obtenir une structure aust\u00e9nite unique stable, la teneur minimale en nickel est requise, environ 8%. \u00c0 cet \u00e9gard, l'acier inoxydable aust\u00e9nitique au chrome-nickel 18Cr-8Ni couramment utilis\u00e9 est le plus appropri\u00e9 pour la teneur en chrome-nickel.<\/p>\n\n\n

\n
\"tubes<\/a><\/figure>\n<\/div>\n\n\n

Dans les aciers inoxydables aust\u00e9nitiques, avec l'augmentation de la teneur en chrome, la tendance \u00e0 la formation de certaines phases interm\u00e9talliques (comme la phase \u03b4) augmente.<\/p>\n\n\n\n

Lorsque l'acier contient molybd\u00e8ne<\/a>Comme indiqu\u00e9 pr\u00e9c\u00e9demment, la pr\u00e9cipitation de la phase \u03c3, x non seulement r\u00e9duit consid\u00e9rablement la plasticit\u00e9 et la t\u00e9nacit\u00e9 de l'acier, mais r\u00e9duit \u00e9galement la r\u00e9sistance \u00e0 la corrosion de l'acier dans certaines conditions.<\/p>\n\n\n\n

L'augmentation de la teneur en chrome dans l'acier inoxydable aust\u00e9nitique peut faire baisser la temp\u00e9rature de la martensite \u00e0 l'hydrocarbure (Ms ), am\u00e9liorant ainsi la stabilit\u00e9 de la matrice aust\u00e9nitique. Par cons\u00e9quent, l'acier inoxydable aust\u00e9nitique \u00e0 haute teneur en chrome (par exemple, plus de 20%) est difficile \u00e0 obtenir une structure martensitique m\u00eame apr\u00e8s un \u00e9crouissage \u00e0 froid et un traitement \u00e0 basse temp\u00e9rature.<\/p>\n\n\n\n

Le chrome est un \u00e9l\u00e9ment de formation de carbure solide, et il ne fait pas exception \u00e0 l'acier inoxydable aust\u00e9nitique.<\/p>\n\n\n\n

L'effet du chrome sur les performances<\/strong><\/h3>\n\n\n\n

Vient g\u00e9n\u00e9ralement, tant que l'aust\u00e9nitique tuyau en acier inoxydable<\/a> maintient une structure d'aust\u00e9nite compl\u00e8te sans formation de ferrite delta, etc., am\u00e9liore seulement la teneur en chrome n'aura pas d'effet significatif sur les propri\u00e9t\u00e9s m\u00e9caniques, et le chrome affectera l'aust\u00e9nite.<\/p>\n\n\n\n

L'effet le plus important des performances de l'acier inoxydable est la r\u00e9sistance \u00e0 la corrosion, principalement comme suit\u00a0: <\/strong><\/p>\n\n\n\n

le chrome am\u00e9liore les performances de l'acier en mati\u00e8re de r\u00e9sistance \u00e0 l'oxydation et aux chlorures acides ; sous l'action combin\u00e9e du nickel, du molybd\u00e8ne et du cuivre, le chrome am\u00e9liore la r\u00e9sistance de l'acier \u00e0 certains milieux r\u00e9ducteurs, \u00e0 l'acide organique, \u00e0 l'ur\u00e9e et aux milieux alcalins ; le chrome am\u00e9liore \u00e9galement la r\u00e9sistance de l'acier \u00e0 la corrosion localis\u00e9e, telle que corrosion intergranulaire<\/a>La corrosion par piq\u00fbres, la corrosion par crevasses et la r\u00e9sistance \u00e0 la contrainte dans certaines conditions.<\/p>\n\n\n\n

Il a le plus grand impact sur la sensibilit\u00e9 de l'acier inoxydable aust\u00e9nitique intergranulaire, le facteur est la teneur en carbone de l'acier et d'autres \u00e9l\u00e9ments.<\/p>\n\n\n\n

Le r\u00f4le du chrome dans la r\u00e9sistance \u00e0 la corrosion de l'acier inoxydable avec les conditions du milieu exp\u00e9rimental et l'environnement d'utilisation r\u00e9el.<\/strong><\/p>\n\n\n\n

Dans la solution bouillante de MgCl2, le r\u00f4le du chrome est g\u00e9n\u00e9ralement nocif, mais dans les milieux aqueux contenant du Cl- et de l'oxyg\u00e8ne, dans des conditions de corrosion \u00e0 haute temp\u00e9rature et haute pression et sous contrainte avec corrosion par piq\u00fbres comme origine, l'augmentation de la teneur en chrome dans l'acier est b\u00e9n\u00e9fique pour la r\u00e9sistance \u00e0 la corrosion sous contrainte. Le chrome peut \u00e9galement emp\u00eacher l'acier inoxydable aust\u00e9nitique et les alliages susceptibles d'appara\u00eetre entre les grains en raison de l'augmentation de la teneur en nickel. La tendance \u00e0 la corrosion sous contrainte de type, l'effet du chrome sur la corrosion sous contrainte de causticit\u00e9 ouverte (Nq0H) est \u00e9galement b\u00e9n\u00e9fique.<\/p>\n\n\n\n

En plus d'avoir une influence importante sur la r\u00e9sistance \u00e0 la corrosion de l'acier inoxydable aust\u00e9nitique \u00e0 nombre n\u00e9gatif, le chrome peut \u00e9galement am\u00e9liorer consid\u00e9rablement la r\u00e9sistance \u00e0 l'oxydation, la r\u00e9sistance \u00e0 la sulfuration et la r\u00e9sistance \u00e0 la corrosion par les sels de fusion de ces aciers.<\/p>","protected":false},"featured_media":5709,"template":"","categories":[186],"tags":[],"class_list":["post-6214","blog","type-blog","status-publish","has-post-thumbnail","hentry","category-stainless-steel-knowledge"],"yoast_head":"\nThe Role Of Chromium In Stainless Steel - Stainless Steel Pipe Fittings<\/title>\n<meta name=\"description\" content=\"The corrosion resistance of austenitic stainless steel is mainly due to the role of chromium in stainless steel promotes the passivation...\" \/>\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\/fr\/blog\/le-role-du-chrome-dans-lacier-inoxydable\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Role Of Chromium In Stainless Steel - 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