C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/18 (2006.01) C21D 6/00 (2006.01) C21D 8/10 (2006.01)
Patent
CA 2262288
The martensitic stainless steel product comprises a base steel and a dual oxide scale layer on a surface of the steel, wherein the dual scale layer includes an inner scale layer containing FeCr2O4 and Fe3O4 as main components and an outer scale layer containing Fe3O4 as a main component and having an outermost Fe2O3 layer; or includes an inner scale layer containing FeCr2O4 and FeO as main components and an outer scale layer containing FeO and Fe3O4 as main components and having an outermost Fe2O3 layer. If the product is a steel pipe, it exhibits excellent corrosion resistance when used for an oil country tubular goods or line pipe.
Amaya Hisashi
Anraku Toshiro
Hidaka Yasuyoshi
Gowling Lafleur Henderson Llp
Sumitomo Metal Industries Ltd.
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