{"id":2079,"date":"2018-02-23T08:08:35","date_gmt":"2018-02-23T08:08:35","guid":{"rendered":"https:\/\/wldstainless.com\/?p=2079"},"modified":"2021-02-23T08:39:28","modified_gmt":"2021-02-23T08:39:28","slug":"304-stainless-steel-vs-321-stainless-steel","status":"publish","type":"post","link":"https:\/\/wldstainless.com\/fr\/304-stainless-steel-vs-321-stainless-steel\/","title":{"rendered":"Acier inoxydable 304 VS acier inoxydable 321"},"content":{"rendered":"<p>Les grades 304 et 321 appartiennent tous deux \u00e0 la s\u00e9rie d\u2019acier inoxydable Austenitic 300. Ils pr\u00e9sentent des caract\u00e9ristiques similaires en mati\u00e8re de r\u00e9sistance \u00e0 la corrosion, de r\u00e9sistance \u00e0 la rupture, de duret\u00e9 et de soudabilit\u00e9, mais le grade 321 est principalement utilis\u00e9 dans les conditions de r\u00e9sistance \u00e0 la chaleur de 500 \u00e0 600 \u00b0C. L\u2019acier inoxydable 321H est la version \u00e0 faible teneur en carbone de l\u2019acier 321, est l\u2019acier r\u00e9sistant \u00e0 la chaleur le plus utilis\u00e9, dont le contenu en carbone est l\u00e9g\u00e8rement sup\u00e9rieur \u00e0 celui des grades 321. <a href=\"https:\/\/wldstainless.com\/materials\/austenitic-stainless-steel\/304-304l-stainless-steel\/\">Acier 304<\/a> C\u2019est un mat\u00e9riau de remplacement de l\u2019acier inoxydable 321 lorsque l\u2019on recherche une r\u00e9sistance \u00e0 la corrosion intergranulaire plut\u00f4t que de la r\u00e9sistance \u00e0 haute temp\u00e9rature.<\/p>\n<p>D'une certaine mani\u00e8re, l'acier inoxydable de qualit\u00e9 321 est une nouvelle version bas\u00e9e sur <a href=\"https:\/\/wldstainless.com\/materials\/austenitic-stainless-steel\/304-304l-stainless-steel\/\">Grade 304<\/a> En ajoutant du Ti pour am\u00e9liorer la r\u00e9sistance \u00e0 la corrosion des zones de transition des grains et la r\u00e9sistance \u00e0 hautes temp\u00e9ratures. En tant qu\u2019\u00e9l\u00e9ment stabilisateur, le Ti contr\u00f4le la formation de carbure de chrome, ce qui rend le 321 tr\u00e8s r\u00e9sistant \u00e0 hautes temp\u00e9ratures, bien plus que le 304 et le 316L. Une teneur plus \u00e9lev\u00e9e en nickel conf\u00e8re au 321 une bonne r\u00e9sistance \u00e0 l\u2019abrasion \u00e0 diff\u00e9rentes concentrations et temp\u00e9ratures d\u2019acides organiques, notamment dans des milieux oxydants. <a href=\"https:\/\/wldstainless.com\/materials\/austenitic-stainless-steel\/321-321h-stainless-steel\/\">Acier inoxydable 321<\/a> Il pr\u00e9sente une meilleure propri\u00e9t\u00e9 de rupture \u00e0 la pression et une r\u00e9sistance \u00e0 la fatigue m\u00e9caniques compar\u00e9es \u00e0 l'acier inoxydable 304. Je vous montre exactement la diff\u00e9rence entre eux avec les deux tableaux ci-dessous.<\/p>\n<p>&nbsp;<\/p>\n<h3>Composition chimique des 304, 321 et 321H<\/h3>\n<table>\n<tbody>\n<tr>\n<td width=\"85\">Notes<\/td>\n<td width=\"85\">C<\/td>\n<td width=\"85\">Oui<\/td>\n<td width=\"85\">Mn<\/td>\n<td width=\"85\">Cr<\/td>\n<td width=\"85\">Ni<\/td>\n<td width=\"85\">S<\/td>\n<td width=\"85\">P<\/td>\n<td width=\"85\">N<\/td>\n<td width=\"85\">Ti<\/td>\n<\/tr>\n<tr>\n<td width=\"85\"><a href=\"https:\/\/wldstainless.com\/materials\/austenitic-stainless-steel\/304-304l-stainless-steel\/\">304<\/a><\/td>\n<td width=\"85\">0.08<\/td>\n<td width=\"85\">1.0<\/td>\n<td width=\"85\">2.0<\/td>\n<td width=\"85\">18.0\uff5e20.0<\/td>\n<td width=\"85\">8.0\uff5e10.5<\/td>\n<td width=\"85\">0.03<\/td>\n<td width=\"85\">0.045<\/td>\n<td width=\"85\">\/<\/td>\n<td width=\"85\">\/<\/td>\n<\/tr>\n<tr>\n<td width=\"85\">321<\/td>\n<td width=\"85\">0.08<\/td>\n<td width=\"85\">1.0<\/td>\n<td width=\"85\">2.0<\/td>\n<td width=\"85\">17.0-19.0<\/td>\n<td width=\"85\">9.0-12.0<\/td>\n<td width=\"85\">0.03<\/td>\n<td width=\"85\">0.045<\/td>\n<td width=\"85\">0.1<\/td>\n<td width=\"85\">5C-0,70<\/td>\n<\/tr>\n<tr>\n<td width=\"85\">321H<\/td>\n<td width=\"85\">0.04-0.1<\/td>\n<td width=\"85\">1.0<\/td>\n<td width=\"85\">2.0<\/td>\n<td width=\"85\">17.0-19.0<\/td>\n<td width=\"85\">9.0-12.0<\/td>\n<td width=\"85\">0.03<\/td>\n<td width=\"85\">0.045<\/td>\n<td width=\"85\">0.1<\/td>\n<td width=\"85\">0.16-0.7<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h3>Propri\u00e9t\u00e9s m\u00e9caniques des aciers 304 et 321<\/h3>\n<table>\n<tbody>\n<tr>\n<td width=\"170\">Notes<\/td>\n<td width=\"170\">R\u00e9sistance \u00e0 la traction, MPa<\/td>\n<td width=\"170\">R\u00e9sistance \u00e0 la traction, MPa<\/td>\n<td width=\"170\">Extension, %<\/td>\n<td width=\"170\">Duret\u00e9, HB<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">304<\/td>\n<td width=\"170\">\u2265520<\/td>\n<td width=\"170\">205-210<\/td>\n<td width=\"170\">\u226540\u226540<\/td>\n<td width=\"170\">HB187<\/td>\n<\/tr>\n<tr>\n<td width=\"170\">321<\/td>\n<td width=\"170\">\u2265520<\/td>\n<td width=\"170\">\u2265205<\/td>\n<td width=\"170\">&nbsp;<\/td>\n<td width=\"170\">HB187<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<p>Comme on peut le constater dans le tableau ci-dessus, l'acier inoxydable 321 contient du titane et davantage de nickel (Ni) que l'acier inoxydable 304, selon la norme ASTM A182. Le contenu de Ti ne doit pas \u00eatre inf\u00e9rieur \u00e0 5 fois la teneur en carbone (C), mais ne doit pas d\u00e9passer 0,7%. Le titane peut pr\u00e9venir la sensibilisation de l'acier inoxydable et am\u00e9liorer la dur\u00e9e de service \u00e0 haute temp\u00e9rature, c'est-\u00e0-dire : <a href=\"https:\/\/wldstainless.com\/materials\/austenitic-stainless-steel\/321-321h-stainless-steel\/\">grade 321<\/a> Il convient mieux \u00e0 la fabrication de r\u00e9cipients \u00e0 base acide r\u00e9sistants \u00e0 l\u2019usure, d\u2019\u00e9quipements r\u00e9sistants \u00e0 l\u2019usure et de tuyaux de transport ou d\u2019autres pi\u00e8ces que l\u2019acier inoxydable 304 dans un environnement \u00e0 haute temp\u00e9rature.<\/p>\n<p>Les aciers inoxydables 304 et 321 peuvent \u00eatre utilis\u00e9s dans les domaines de la chimie, du p\u00e9trole et du gaz, ainsi que dans l\u2019industrie automobile. L\u2019acier inoxydable 304 est un acier inoxydable polyvalent et poss\u00e8de les applications les plus \u00e9tendues dans la famille des aciers inoxydables, telles que les ustensiles de cuisine, les armoires, les chaudi\u00e8res, les pi\u00e8ces automobiles, les appareils m\u00e9dicaux, les mat\u00e9riaux de construction, les produits chimiques, l\u2019industrie alimentaire, l\u2019agriculture, le transport maritime, le transport de p\u00e9trole et ainsi de suite. L\u2019acier inoxydable 321 est utilis\u00e9 dans les domaines de la chimie, du charbon et du p\u00e9trole, o\u00f9 il est n\u00e9cessaire de r\u00e9sister \u00e0 la corrosion des limites des grains ainsi qu\u2019\u00e0 des propri\u00e9t\u00e9s \u00e0 haute temp\u00e9rature telles que les tubes d\u2019\u00e9chappement des moteurs, les tubes d\u2019\u00e9chappement des moteurs, les coffrets des chaudi\u00e8res, les \u00e9changeurs de chaleur, les composants des fours, les silencieux des moteurs diesel, les cuves de pression des fours, les r\u00e9servoirs de transport de produits chimiques, les joints d\u2019\u00e9tanch\u00e9it\u00e9, les tubes des fours, etc.<\/p>","protected":false},"excerpt":{"rendered":"<p>Both grade 304 and 321 belong to the Austenitic 300 series stainless steel. They are similar in corrosion resistance, strength, hardness and welding performance, but 321 is mostly used in the heat resistance condition of 500-600 \u2103. 321H stainless steel is the low-carbon version of 321, is the commonly used heat resistant steel, of which [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-2079","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"In a way, grade 321 stainless steel is a new version based on 304 by adding Ti to improve the corrosion resistance of grain boundary and high temperature strength.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"WLD 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