{"id":15321,"date":"2021-11-29T12:27:31","date_gmt":"2021-11-29T12:27:31","guid":{"rendered":"https:\/\/www.kaysuns.com\/?p=15321"},"modified":"2025-08-29T07:58:39","modified_gmt":"2025-08-29T07:58:39","slug":"traitement-en-solution-des-raccords-de-tuyauterie-en-acier-inoxydable","status":"publish","type":"blog","link":"https:\/\/www.kaysuns.com\/fr\/blog\/traitement-en-solution-des-raccords-de-tuyauterie-en-acier-inoxydable\/","title":{"rendered":"Traitement en solution des raccords de tuyauterie en acier inoxydable"},"content":{"rendered":"
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Traitement en solution des raccords de tuyauterie en acier inoxydable<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Pourquoi les tuyaux et les raccords en acier inoxydable doivent-ils \u00eatre trait\u00e9s en solution ?<\/h2>

La raison en est qu'il peut contribuer \u00e0 restaurer la r\u00e9sistance \u00e0 la corrosion inh\u00e9rente \u00e0 l'acier inoxydable.<\/p>

En raison de la pr\u00e9cipitation des carbures et des d\u00e9fauts du r\u00e9seau caus\u00e9s par le traitement \u00e0 froid, la r\u00e9sistance \u00e0 la corrosion de l'acier inoxydable diminue. Cependant, apr\u00e8s un traitement de mise en solution, la r\u00e9sistance \u00e0 la corrosion de l'acier inoxydable diminue. raccords de tuyauterie en acier inoxydable<\/a> peut \u00eatre restaur\u00e9 au mieux.<\/p>

Pour tuyaux et raccords en acier inoxydable<\/a>les trois facteurs les plus importants sont la temp\u00e9rature, le temps de conservation et la vitesse de refroidissement. La temp\u00e9rature pour le traitement de la solution est d\u00e9termin\u00e9e par ses composants chimiques.<\/p>

En g\u00e9n\u00e9ral, plus il y a de composants et plus la teneur en alliage est \u00e9lev\u00e9e, plus la temp\u00e9rature de la solution doit \u00eatre augment\u00e9e en cons\u00e9quence, en particulier pour l'acier \u00e0 forte teneur en mangan\u00e8se., molybd\u00e8ne<\/a>, nickel et silicium. L'adoucissement<\/a> effet peut \u00eatre obtenu et compl\u00e8tement dissous apr\u00e8s l'augmentation de la temp\u00e9rature de la solution.<\/p>

Cependant, pour certains aciers stabilis\u00e9s tels que le 1Cr18Ni9Ti, ses carbures d'\u00e9l\u00e9ments stabilis\u00e9s seront enti\u00e8rement dissous dans l'aust\u00e9nite \u00e0 haute temp\u00e9rature de solution. Apr\u00e8s refroidissement, ils pr\u00e9cipiteront sous forme de Cr23C6 aux joints de grains, ce qui entra\u00eenera corrosion intergranulaire<\/a>. Afin d'emp\u00eacher la d\u00e9composition et la dissolution solide des carbures (TiC et Nbc) des \u00e9l\u00e9ments stabilis\u00e9s, il est recommand\u00e9 d'adopter une temp\u00e9rature de dissolution solide basse.<\/p>

L'acier inoxydable dont on parle habituellement d\u00e9signe les aciers qui r\u00e9sistent mal \u00e0 la rouille. En fait, certains aciers inoxydables sont \u00e0 la fois r\u00e9sistants \u00e0 la rouille et \u00e0 la corrosion. Et ce, gr\u00e2ce au film d'oxyde riche en chrome (film de passivation) pr\u00e9sent \u00e0 leur surface. Pour l'acier inoxydable, la r\u00e9sistance \u00e0 la rouille et la r\u00e9sistance \u00e0 la corrosion sont relatives.<\/p>

L'exp\u00e9rience a montr\u00e9 que la r\u00e9sistance \u00e0 la corrosion de l'acier inoxydable dans l'atmosph\u00e8re, l'eau et les milieux oxydants est li\u00e9e au chrome. Une teneur plus \u00e9lev\u00e9e en chrome apporte une meilleure r\u00e9sistance \u00e0 la corrosion. Lorsque la teneur en chrome atteint 100%, il devient non r\u00e9sistant \u00e0 la corrosion et r\u00e9sistant \u00e0 la corrosion.<\/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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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La temp\u00e9rature de chauffage, le temps de conservation et la vitesse de refroidissement sont les trois principaux param\u00e8tres qui doivent \u00eatre contr\u00f4l\u00e9s dans le recuit de mise en solution :<\/p>

En principe, la temp\u00e9rature de chauffage peut \u00eatre d\u00e9termin\u00e9e en fonction du diagramme de phase correspondant. Et la temp\u00e9rature limite sup\u00e9rieure est g\u00e9n\u00e9ralement proche de la temp\u00e9rature de la ligne solide ou de la temp\u00e9rature eutectique. Sous une temp\u00e9rature aussi \u00e9lev\u00e9e, l'alliage aura une solubilit\u00e9 solide maximale et une vitesse de diffusion rapide. Cependant, la temp\u00e9rature ne doit pas \u00eatre trop \u00e9lev\u00e9e, sinon elle conduira \u00e0 la fusion de la phase eutectique \u00e0 bas point de fusion et de la phase de joint de grain, ce qui est connu comme le ph\u00e9nom\u00e8ne de surchauffe, entra\u00eenant des fissures de trempe et une r\u00e9duction de la t\u00e9nacit\u00e9.<\/p>

La temp\u00e9rature minimale de chauffage doit \u00eatre sup\u00e9rieure \u00e0 la courbe de solution (ligne AB sur la figure), sinon les performances de l'acier ne seront pas conformes aux exigences apr\u00e8s vieillissement. La plage des temp\u00e9ratures de chauffage admissibles peut varier consid\u00e9rablement d'un alliage \u00e0 l'autre. La plage de temp\u00e9rature de chauffage de certains alliages de cuivre et aciers alli\u00e9s est large, tandis que la plage de temp\u00e9rature de trempe de la plupart des alliages d'aluminium est tr\u00e8s \u00e9troite, certains n'autorisant m\u00eame que des diff\u00e9rences de 5 degr\u00e9s Celsius.<\/p>

Le but de la pr\u00e9servation de la temp\u00e9rature est de transformer suffisamment la structure de l'alliage \u00e0 l'\u00e9tat requis pour la trempe. Et le temps de pr\u00e9servation d\u00e9pend principalement de la composition de l'alliage, du pr\u00e9traitement du mat\u00e9riau, de la structure d'origine, de la temp\u00e9rature de chauffage et ainsi de suite, ainsi que de la quantit\u00e9 de four, de l'\u00e9paisseur de la pi\u00e8ce, de la m\u00e9thode de chauffage et d'autres facteurs. Si la structure d'origine est fine, la temp\u00e9rature de chauffage est \u00e9lev\u00e9e, la quantit\u00e9 de chargement est faible ou la section de la pi\u00e8ce est petite, le temps de conservation sera court.<\/p>

Pour le recuit de mise en solution, il adopte g\u00e9n\u00e9ralement un refroidissement rapide. Son objectif est d'emp\u00eacher la pr\u00e9cipitation de la seconde phase pendant le processus de refroidissement et d'assurer la sursaturation maximale des atomes de solut\u00e9 et des lacunes, afin d'obtenir la plus haute r\u00e9sistance et la meilleure r\u00e9sistance \u00e0 la corrosion apr\u00e8s le vieillissement. Et l'eau est largement utilis\u00e9e comme un moyen de trempe efficace. La plupart des produits en alliage \u00e0 base d'aluminium, de magn\u00e9sium, de cuivre, de nickel et de fer peuvent atteindre une vitesse de refroidissement rapide.<\/p>

Cependant, la trempe dans l'eau peut facilement provoquer de grandes contraintes r\u00e9siduelles et des d\u00e9formations. Pour rem\u00e9dier \u00e0 ce probl\u00e8me, la temp\u00e9rature de l'eau peut \u00eatre augment\u00e9e de mani\u00e8re appropri\u00e9e, ou les produits de trempe peuvent \u00eatre tremp\u00e9s dans l'huile, l'air et certains milieux organiques sp\u00e9ciaux. Certaines m\u00e9thodes de trempe sp\u00e9ciales peuvent \u00eatre adopt\u00e9es, telles que la trempe isotherme et la trempe fractionn\u00e9e.<\/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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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