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Stainless steel for oil well, stainless steel pipe for oil well, and process for production of stainless steel for oil well
Stainless steel for oil well, stainless steel pipe for oil well, and process for production of stainless steel for oil well
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机译:油井用不锈钢,油井用不锈钢管以及油井用不锈钢的制造方法
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摘要
Disclosed is a stainless steel having the following chemical composition: C: 0.05% or less, Si: 0.5% or less, Mn: 0.01 to 0.5%, P: 0.04% or less, S: 0.01% or less, Cr: more than 16.0% and not more than 18.0%, Ni: more than 4.0% and not more than 5.6%, Mo: 1.6 to 4.0%, Cu: 1.5 to 3.0%, Al: 0.001 to 0.10%, and N: 0.050% or less, with the remainder being Fe and impurities, wherein the components meet the requirements represented by formulae (1) and (2). The structure of the stainless steel contains a martensite phase and 10 to 40% by volume of a ferrite phase, wherein the percentage of distribution of the ferrite phase is greater than 85%.Cr + Cu + Ni + Mo ≥ 25.5 (1)-8 ≤ 30(C+N) + 0.5Mn + Ni + Cu/2 + 8.2 - 1.1(Cr+Mo) ≤ -4 (2)
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