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发明公开
CN104379774A 油井管用高强度不锈钢无缝管及其制造方法 有权

油井管用高强度不锈钢无缝管及其制造方法
摘要：
本发明提供壁厚大于25.4mm的厚壁且为110ksi(758MPa)以上、vE-10为40J以上、在高温腐蚀环境下的耐腐蚀性优良的油井管用不锈钢无缝钢管。对钢原材进行加热，实施热轧而制成无缝钢管，所述钢原材具有如下组成：以质量％计，含有C：0.005～0.06％、Si：0.05～0.5％、Mn：0.2～1.8％、Cr：15.5～18.0％、Ni：1.5～5.0％、V：0.02～0.2％、Al：0.002～0.05％、N：0.01～0.15％、O：0.006％以下，并且以满足Cr+0.65Ni+0.60Mo+0.30W+0.55Cu-20C≥19.5、Cr+Mo+0.50W+0.30Si-43.5C-0.4Mn-Ni-0.3Cu-9N≥11.5的方式含有选自Mo：1.0～3.5％、W：3.0％以下、Cu：3.5％以下中的1种以上。此时，热轧为在1100～900℃温度范围内的总轧制率为30％以上的热轧。在热轧结束后，以空冷以上的冷却速度进行冷却，进一步实施淬火回火处理。
摘要（英）：

Provided is a high-strength stainless steel seamless pipe for use as oil well piping that has a wall thickness surpassing 25.4 mm, that is rated at 110 ksi (758 MPa) or higher, that exhibits a vE-10 of 40J or higher, and that exhibits excellent corrosion resistance in a high-temperature corrosive environment. The steel seamless pipe is obtained by heating and hot rolling a steel material of which the composition includes, in terms of mass%, 0.005-0.06% of C, 0.05-0.5% of Si, 0.2-1.8% of Mn, 15.5-18.0% of Cr, 1.5-5.0% of Ni, 0.02-0.2% of V, 0.002-0.05% of Al, 0.01-0.15% of N, and 0.006% or less of O, and additionally includes 1.0-3.5% of Mo and/or 3.0% or less of W and/or 3.5% or less of Cu so as to satisfy Cr+0.65Ni+0.60Mo+0.30W+0.55Cu-20C>=19.5 and Cr+Mo+0.50W+0.30Si-43.5C- 0.4Mn-Ni-0.3Cu-9N>=11.5. On this occasion, hot rolling is carried out so as to achieve a total rolling reduction rate of 30% or more in the temperature range of 1100-900 DEG C. After completion of hot rolling, cooling is carried out at a cooling rate faster than that of air cooling, and a hardening-tempering treatment is performed.

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