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发明公开
CN110462085A 马氏体不锈钢材 无效 - 撤回

马氏体不锈钢材
摘要：
本发明的马氏体不锈钢材具备如下的化学组成：以质量％计含有C：0.030％以下、Si：1.00％以下、Mn：1.00％以下、P：0.030％以下、S：0.005％以下、Al：0.0010～0.0100％、N：0.0500％以下、Ni：5.00～6.50％、Cr：10.00～13.40％、Cu：1.80～3.50％、Mo：1.00～4.00％、V：0.01～1.00％、Ti：0.050～0.300％、Co：0.300％以下，余量为Fe和杂质，满足式(1)和式(2)；所述马氏体不锈钢材具备724～860MPa的屈服强度、以及以体积率计具有80％以上的马氏体的组织。组织中的各金属间化合物和各Cr氧化物的大小为5.0μm2以下，并且，金属间化合物和Cr氧化物的总面积率为3.0％以下。11.5≤Cr+2Mo+2Cu-1.5Ni≤14.3 (1)，Ti/C≥7.5 (2)。
摘要（英）：

This martensitic stainless steel material has a chemical composition which contains, in mass%, 0.030% or less of C, 1.00% or less of Si, 1.00% or less of Mn, 0.030% or less of P, 0.005% or less of S,0.0010-0.0100% of Al, 0.0500% or less of N, 5.00-6.50% of Ni, 10.00-13.40% of Cr, 1.80-3.50% of Cu, 1.00-4.00% of Mo, 0.01-1.00% of V, 0.050-0.300% of Ti and 0.300% or less of Co, with the balance being made up of Fe and impurities, and which satisfies formula (1) and formula (2). In addition, this martensitic stainless steel material has a structure that contains 80% by volume or more of martensite, while having a yield strength of 724-860 MPa. The size of each inter-metallic compound and each Cr oxide in the structure is 5.0 [mu]m2 or less; and the total area ratio of the inter-metallic compounds and the Cr oxides is 3.0% or less. 11.5<=Cr+2Mo+2Cu-1.5Ni<=14.3 (1) Ti/C>=7.5 (2)

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