MARTENSITIC STAINLESS STEEL

专利名称：MARTENSITIC STAINLESS STEEL

发明人：KONDO, Kunio, Sumitomo Metal Industries,

Ltd.,KUSHIDA, Takahiro, Sumitomo MetalIndustries, Ltd.,KOMIZO, Yuichi, SumitomoMetal Industries, Ltd.,IGARASHI, Masaaki,Sumitomo Metal Industries, Ltd.

申请号：EP02728217.7申请日：20020531公开号：EP1403391A1公开日：20040331

专利附图：

摘要：A martensitic stainless steel having a C content of 0.01 to 0.1 mass %, a Crcontent of 9 to 15 mass % and a N content of not more than 0.1 mass %, wherein thecontent of carbides inside old austenite grain boundaries in the steel is not more than 0.5volume %, or wherein the maximum length of the carbides in the steel is 10 to 200 nm inthe direction of the minor axis, or wherein the ratio ([Cr]/[Fe]) of the average Crconcentration [Cr] to the average Fe concentration [Fe] in carbides in the steel is notmore than 0.4, or wherein the content of M23C6 type carbides is not more than 1 volume%, the content of M3C type carbides is 0.01 to 1.5 volume % and the content of MN typeor M2N type nitrides is not more than 0.3 volume % is provided. This stainless steel has ahigh toughness in spite of both a relatively more C content and a high strength, therebyproviding a wide applicability to pipe material for oil wells containing carbon dioxide anda very small amount of hydrogen sulfide, in particular for oil wells having a much greaterdepth.

申请人：SUMITOMO METAL INDUSTRIES, LTD.

地址：5-33, Kitahama 4-chome, Chuo-ku Osaka-shi, Osaka 1-0041 JP

国籍：JP

代理机构：Cresswell, Thomas Anthony

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