Post weld heat treatment for chemically stabilized...

C - Chemistry – Metallurgy – 21 – D

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C21D 1/30 (2006.01) C21D 9/50 (2006.01)

Patent

CA 2537506

Thermo-mechanicl properties of welds in stainless steel is substantially improved by the implementation of a post weld heat treatment that iliminates sigma phase in the heat treated zone and favors niobium carbonitride precipitate formation in a desirerable size range. In most cases, post weld heat treated material can be employed in pressurized devices at temperatures exceeding 550~C, which is curently regarded the upper safe temperature limit, and material according to the inventive subject matter was tested at temperature of up to 850~C without reheat cracking.

L'invention concerne des propriétés thermo-mécaniques pour des soudures en acier inoxydable, lesquelles sont sensiblement améliorées grâce à la mise en place d'un traitement thermique effectué après la soudure qui élimine la phase sigma dans la zone traitée thermiquement et favorise la formation d'un précipité de carbonitrure de niobium dans une gamme de tailles souhaitée. Dans la plupart des cas, le matériau traité thermiquement après la soudure peut être utilisé dans des dispositifs sous pression à des températures dépassant 550 ·C, ce qui est courant au regard de la limite de température de sécurité supérieure, et le matériau de l'invention a été testé à une température supérieure à 850 ·C sans craquage de rechauffe.

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