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发明公开
CN101629476A 耐-40～-80℃低温的高强高韧性石油套管 有权 转让

耐-40～-80℃低温的高强高韧性石油套管
摘要：
本发明提供一种耐-40～-80℃低温的高强高韧性石油套管，其中：该套管组成以质量％计，含有C：0.16％～0.35％、Si：0.10％～0.50％、Mn：0.15％～1.45％、P：0.001％～0.010％、S：0.0001％～0.003％、Ni：0.15％～1.45％、Cr：0.25％～1.50％、Mo：0.15％～1.25％、V：0.01％～0.20％、Nb：0.01％～0.08％。本发明的效果是该套管在合金元素设计上采用较低的C元素保证冲击韧性，添加适量的Cr、Mo、Mn、Ni等合金元素来提高材质的强度，同时辅助V、Nb、Ti等微合金化元素细化晶粒，改善钢管的强韧性匹配。使该套管在具有较高的屈服强度的同时，还具有较低的韧脆转变温度和优良的低温冲击韧性。
摘要（英）：

The invention provides a high strength and high toughness petroleum casing pipe capable of bearing low temperature within -40 to -80, wherein the casing pipe comprises the following elements by weight percent: 0.16%-0.35% of C, 0.10-0.50% of Si, 0.15%-1.45% of Mn, 0.001%-0.010% of P, 0.0001%-0.003% of S, 0.15%-1.45% of Ni, 0.25%-1.50% of Cr, 0.15%-1.25% of Mo, 0.01%-0.20% of V and 0.01%-0.08% of Nb. The effect of the invention is that low concentration of carbon element is adopted in the alloy element design of the casing pipe so as to ensure the impact toughness, proper amount of alloy elements such as Cr, Mo, Mn and Ni are added to increase the strength of the material and microalloyed elements such as V, Nb, Ti and the like are added as auxiliary elements so as to refine the particle size and improve the strength-toughness matching of steel pipes. The casing pipe has not only higher yield strength, but also lower ductile-brittle transition temperature and good low-temperature impact toughness.

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