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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生产工艺
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摘要
The chemical composition of a stainless steel in accordance with the present invention consists of C: not more than 0.05%, Si: not more than 0.5%, Mn: 0.01 to 0.5%, P: not more than 0.04%, S: not more than 0.01%, 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: not more than 0.050%, the balance being Fe and impurities, and satisfies Formulas (1) and (2). Also, the micro-structure thereof contains a martensitic phase and a ferritic phase having a volume ratio of 10 to 40%, and the ferritic phase distribution ratio is higher than 85%. Cr + Cu + Ni + Mo ‰¥ 25.5 - 8 ‰¤ 30 �¢ C + N + 0.5 �¢ Mn + Ni + Cu / 2 + 8.2 - 1.1 �¢ Cr + Mo ‰¤ - 4
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机译：根据本发明的不锈钢的化学组成由C：不大于0.05％，Si：不大于0.5％，Mn：0.01至0.5％，P：不大于0.04％，S：不大于0.01％以下，Cr：16.0以上且18.0％以下，Ni：4.0以上且5.6％以下，Mo：1.6〜4.0％，Cu：1.5〜3.0％，Al：0.001〜0.10％， N：0.050％以下，其余为Fe和杂质，满足式（1）和（2）。另外，其微观结构包含体积比为10％至40％的马氏体相和铁素体相，并且铁素体相的分配率高于85％。 Cr + Cu + Ni + Mo≥25.5-8‰¤30¢C + N + 0.5¢Mn + Ni + Cu / 2 + 8.2-1.1¢Cr + Mo‰-4
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