{"id":6095,"date":"2020-06-10T07:14:07","date_gmt":"2020-06-10T07:14:07","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=6095"},"modified":"2025-07-10T06:29:37","modified_gmt":"2025-07-10T06:29:37","slug":"pourquoi-certains-aciers-inoxydables-ont-ils-une-nuance-l-h","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/fr\/blog\/pourquoi-certains-aciers-inoxydables-ont-ils-une-nuance-l-h\/","title":{"rendered":"Que sont l'acier inoxydable H et L"},"content":{"rendered":"

Les nuances aust\u00e9nitiques sont les alliages couramment utilis\u00e9s dans les applications d'acier inoxydable. L'acier inoxydable aust\u00e9nitique n'est pas magn\u00e9tique. L'alliage aust\u00e9nitique le plus courant est l'acier fer-chrome-nickel, largement connu sous le nom de s\u00e9rie 300.<\/p>\n\n\n\n

En raison de la teneur \u00e9lev\u00e9e en chrome et en nickel, les tuyaux en acier inoxydable aust\u00e9nitique sont les plus r\u00e9sistants \u00e0 la corrosion du groupe des aciers inoxydables, offrant des propri\u00e9t\u00e9s m\u00e9caniques exceptionnellement bonnes. Ils ne peuvent pas \u00eatre durcis par traitement thermique, mais peuvent \u00eatre consid\u00e9rablement durcis par \u00e9crouissage.<\/p>\n\n\n\n

Grade droit<\/strong><\/p>\n\n\n\n

Les grades droits de tuyaux en acier inoxydable aust\u00e9nitique<\/a> contenir jusqu'\u00e0 0,08% de carbone. Il existe une id\u00e9e fausse selon laquelle l'acier de qualit\u00e9 pure contient au moins 0,035% de carbone, mais la sp\u00e9cification ne l'exige pas. Tant que le mat\u00e9riau r\u00e9pond aux exigences physiques de qualit\u00e9 pure, il n'y a pas d'exigence minimale en carbone.<\/p>\n\n\n\n

\"Grade \"L<\/strong><\/p>\n\n\n\n

Le grade \"L\" est utilis\u00e9 pour offrir une r\u00e9sistance suppl\u00e9mentaire \u00e0 la corrosion apr\u00e8s soudage. La lettre \"L\" apr\u00e8s le tuyau en acier inoxydable<\/a> indique un faible taux de carbone (par exemple 304L). Maintenez le carbone \u00e0 0,035% ou moins pour \u00e9viter la pr\u00e9cipitation du carbure. Le carbone dans l'acier pr\u00e9cipite lorsqu'il est chauff\u00e9 \u00e0 une temp\u00e9rature critique de 800\u00b0F \u00e0 1600\u00b0F, se combine avec le chrome et s'accumule sur les joints de grains. Cela enl\u00e8ve le chrome de la solution dans l'acier et favorise la corrosion pr\u00e8s des joints de grains. En contr\u00f4lant la quantit\u00e9 de carbone, ce ph\u00e9nom\u00e8ne est minimis\u00e9. Pour la soudabilit\u00e9, utilisez la qualit\u00e9 \"L\". Vous vous demandez peut-\u00eatre pourquoi tous les aciers inoxydables ne sont pas de qualit\u00e9 \"L\".<\/p>\n\n\n\n

Il y a deux raisons :<\/em><\/p>\n\n\n\n

Le grade \"L\" est plus cher ;
Le carbone a une r\u00e9sistance physique \u00e9lev\u00e9e \u00e0 haute temp\u00e9rature ;
Plus la teneur en carbone est \u00e9lev\u00e9e, plus la limite d'\u00e9lasticit\u00e9 est \u00e9lev\u00e9e.<\/strong><\/p>\n\n\n\n

\"tube<\/figure>\n\n\n\n

Les laminoirs ach\u00e8tent souvent des mati\u00e8res premi\u00e8res de qualit\u00e9 \"L\", mais sp\u00e9cifient les propri\u00e9t\u00e9s physiques des qualit\u00e9s droites afin de maintenir la r\u00e9sistance de ces derni\u00e8res. Le g\u00e2teau est \u00e9galement chauff\u00e9. Le mat\u00e9riau a ainsi obtenu la double certification 304\/304L ; 316\/316L et autres qualit\u00e9s \"H\".<\/p>\n\n\n\n

Les \"Grade \"H<\/strong> La teneur en carbone est d'au moins 0,04% et la teneur maximale en carbone est de 0,10%, ce qui est indiqu\u00e9 par la lettre \"H\" apr\u00e8s l'alliage. Les gens exigent principalement la qualit\u00e9 \"H\", parce que le mat\u00e9riau sera utilis\u00e9 \u00e0 des temp\u00e9ratures extr\u00eames, car la teneur en carbone plus \u00e9lev\u00e9e aide le mat\u00e9riau \u00e0 conserver sa r\u00e9sistance \u00e0 des temp\u00e9ratures extr\u00eames.<\/p>\n\n\n\n

Vous entendrez peut-\u00eatre le terme \"recuit de mise en solution\". Cela signifie que seuls les carbures qui ont pu pr\u00e9cipiter (ou se d\u00e9placer vers) le joint de grain sont redissous (dispers\u00e9s) dans la matrice m\u00e9tallique par le processus de recuit. Si le recuit apr\u00e8s soudage n'est pas possible, utilisez le grade \"L\", par exemple dans le domaine du soudage des tuyaux et des raccords.<\/p>\n\n\n\n\n
Type 304<\/strong><\/td>La plus courante des nuances aust\u00e9nitiques, contenant environ 18% de chrome et 8% de nickel. Il est utilis\u00e9 pour les \u00e9quipements de traitement chimique, pour les industries alimentaires, laiti\u00e8res et des boissons, pour les \u00e9changeurs de chaleur et pour les produits chimiques plus doux. <\/td><\/tr>
Type 316<\/strong><\/td>Contient 16% \u00e0 18% de chrome et 11% \u00e0 14% de nickel. Il contient \u00e9galement molybd\u00e8ne<\/a> ajout\u00e9 au nickel et au chrome du 304. Le molybd\u00e8ne est utilis\u00e9 pour contr\u00f4ler les attaques de type piq\u00fbres. Le type 316 est utilis\u00e9 dans le traitement chimique, l'industrie de la p\u00e2te \u00e0 papier et du papier, pour le traitement et la distribution des aliments et des boissons, ainsi que dans les domaines plus environnements corrosifs<\/a>. Le molybd\u00e8ne doit \u00eatre d'au moins 2%. <\/td><\/tr>
Type 317<\/strong><\/td>Contient un pourcentage plus \u00e9lev\u00e9 de molybd\u00e8ne que 316 pour les environnements hautement corrosifs. Il doit avoir un minimum de 3% \u00ab molybd\u00e8ne \u00bb. Il est souvent utilis\u00e9 dans les piles qui contiennent des \u00e9purateurs. <\/td><\/tr>
Taper 317L<\/u><\/strong><\/td>\n Limite la teneur maximale en carbone \u00e0 0,030% max. et silicium \u00e0 0,75% max. pour une r\u00e9sistance accrue \u00e0 la corrosion. <\/td><\/tr>
Type 317LM<\/strong><\/td>N\u00e9cessite une teneur en molybd\u00e8ne de 4.00% min. <\/td><\/tr>
Type 317LMN<\/strong><\/td>N\u00e9cessite une teneur en molybd\u00e8ne de 4.00% min. et azote de 0,15% min. <\/td><\/tr>
Taper 321<\/u>
Taper 347<\/u> <\/strong><\/td>		Ces types ont \u00e9t\u00e9 d\u00e9velopp\u00e9s pour une r\u00e9sistance \u00e0 la corrosion pour une exposition intermittente r\u00e9p\u00e9t\u00e9e \u00e0 une temp\u00e9rature sup\u00e9rieure \u00e0 800 degr\u00e9s F. Le type 321 est fabriqu\u00e9 par l'ajout de titane et le type 347 est fabriqu\u00e9 par l'ajout de tantale\/columbium. Ces nuances sont principalement utilis\u00e9es dans l'industrie a\u00e9ronautique. <\/td><\/tr><\/tbody><\/table>\nVous voudrez peut-\u00eatre aussi lire :\nLa signification des lettres apr\u00e8s les nuances d'acier inoxydable<\/a>","protected":false},"featured_media":6097,"template":"","categories":[186],"tags":[],"class_list":["post-6095","blog","type-blog","status-publish","has-post-thumbnail","hentry","category-stainless-steel-knowledge"],"yoast_head":"\nWhat Are H and L Stainless Steel - Duplex Pipe<\/title>\n<meta name=\"description\" content=\"The "L" grade is used to provide additional corrosion resistance after welding. 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