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发明公开
CN103469097A 高强度马氏体铁素体双相不锈钢耐腐蚀油套管及其制造方法 有权

高强度马氏体铁素体双相不锈钢耐腐蚀油套管及其制造方法
摘要：
高强度马氏体铁素体双相不锈钢耐腐蚀油套管及其制造方法，其成分重量百分比为：C：0.05～0.10%、Si：0.1～0.4%、Mn：0.20～1.0%、P：0.03%以下、S：0.01%以下、Cr：13.5～15.0%、Ni：0.5～1.5%、Mo：0.2～1.0%、Nb：0.005～0.02%、N：0.01～0.10%、O：0.004%以下，并且满足Cr+1.5Mo+2Ni+16N≥17和Ni+30(C+N)+8Nb≥3.5，其中Cr、Ni、Mo、Si、Nb、Mn、C、N为元素的重量百分数含量，其余为Fe和不可避免的杂质；具有耐腐蚀性能优良，屈服强度在110ksi以上。钢管通过实施淬火+回火处理，金相组织中以马氏体相为主体，含有铁素体相在2～10%。该钢管表现出优良的耐CO2腐蚀性能和低温冲击韧性。
摘要（英）：

The invention provides a high-strength martensite and ferrite two-phase stainless steel anti-corrosion oil casing pipe and a manufacturing method of the high-strength martensite ferrite two-phase stainless steel anti-corrosion oil casing pipe. The high-strength martensite ferrite two-phase stainless steel anti-corrosion oil casing pipe comprises, by weight, 0.05% to 0.10% of C, 0.1% to 0.4% of Si, 0.20% to 1.0 % of Mn, less than 0.03% of P, less than 0.01% of S, 13.5% to 15.0% of Cr, 0.5% to 1.5% of Ni, 0.2% to 1.0% of Mo, 0.005% to 0.02% of Nb, 0.01% to 0.10% of N and less than 0.004% of O, wherein the compositions satisfies the inequality that Cr+1.5Mo+2Ni+16N>=17 and the inequality that Ni+30(C+N)+8Nb>=3.5, Cr, Ni, Mo, Si, Nb, Mn, C and N stand for the weight relative content of the elements, and the rest of the oil casing pipe comprises Fe and inevitable impurities. The oil casing pipe has good corrosion resistance performance, and the yield strength is more than 110ksi. The oil casing pipe is quenched and tempered, a martensite phase is used as the main body of a metallographic structure, and the metallographic structure contains 2% to 10% of ferrite phases. The steel pipe has good carbon dioxide corrosion resistance performance and low temperature impact toughness.

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