Stainless steel and stainless steel pipe having resistance...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/40 (2006.01) C22C 30/00 (2006.01) F16L 9/02 (2006.01)

Patent

CA 2474834

A stainless steel pipe includes a base metal containing 20 - 35 mass % of Cr, and a Cr-depleted zone is formed in the surface region of the pipe. The Cr concentration in the Cr-depleted zone is at least 10%, and the thickness of the Cr- depleted zone is at most 20 micrometers. A Cr-based oxide scale layer having a Cr content of at least 50% and a thickness of 0.1 - 15 micrometers may be provided on the outer side of the Cr-depleted zone. An Si-based oxide scale layer with an Si content of at least 50% may be provided between the Cr-based oxide scale layer and the Cr-depleted zone. The pipe is particularly suitable for use in petroleum refineries or petrochemical plants, such as for use as a pipe of a cracking furnace of an ethylene plant.

Un tuyau en acier inoxydable comprend un métal de base contenant de 20 à 35 % en poids de Cr, et une zone appauvrie en Cr est formée dans la région superficielle du tuyau. La concentration de Cr dans la zone appauvrie en Cr est au moins de 10 % et l'épaisseur de la zone appauvrie en Cr est au plus de 20 micromètres. Une couche d'oxyde à base de Cr ayant une teneur en Cr d'au moins 50 % et une épaisseur de 0,1 à 15 micromètres peut être présente sur la paroi extérieure de la zone appauvrie en Cr. Une couche d'oxyde à base de Si ayant une teneur en Si d'au moins 50 % peut être présente entre la couche d'oxyde à base de Cr et la zone appauvrie en Cr. Ce tuyau convient particulièrement aux raffineries de pétrole ou aux usines pétrochimiques, comme par exemple pour un four de craquage d'une usine à éthylène.

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