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发明公开
CN103194693A 一种高强度高韧性石油套管及其制造方法 有权 转让

一种高强度高韧性石油套管及其制造方法
摘要：
本发明公开了一种高强度高韧性石油套管及其制造方法，其采用"高频焊接(HFW）+焊缝在线热处理+热张力减径+全管体热处理"工艺技术制造Q125钢级石油套管，化学成分的重量百分配比为:C:0.18～0.30;ShO.10～0.35;Mn:l.00～1.30;P:≤0.018;S:≤0.008;Cr:O.20～1.2O;Mo:0.20～0.55;NhO.10～0.65;B:O.0010～0.0015;Nb+V+Ti≤O.08，余量为Fe和不可避免的杂质。采用该制造方法生产的Q125石油套管屈服强度≥865MPa，抗拉强度≥94OMPa，延伸率≥23.2%，0°C时全尺寸横向冲击功≥1O5J，纵向冲击功≥1lOJ，该工艺制造的Q125钢级石油套管综合性能优异，具有很好的高强韧性和高强塑性。
摘要（英）：

The invention discloses a high-strength and high-toughness oil casing and a manufacturing method thereof. A 'HFW(High Frequency Welding)+welding line on-line thermal treatment+hot tension reducing+whole casing thermal treatment' technology is used for manufacturing a Q125 steel grade oil casing, and the weight percentage of chemical components are as follows: C: 0.18-0.30; Sh: 0.10-0.35; Mn: 1.00-1.30; P: not more than 0.018; S: not more than 0.008; Cr: 0.20-1.20; Mo: 0.20-0.55; Nh: 0.10-0.56; B: 0.0010-0.0015; Nb+V+Ti: not more than 0.08; and the balance of Fe and unavoidable impurities. For the Q125 oil casing produced by the manufacturing method, the yield strength is not less than 865MPa, the tensile strength is not less than 940MPa, the specific elongation is not less than 23.2%, at 0 DEG C, the full-scale transverse impact energy is not less than 105J and the longitudinal impact energy is not less than 110J. The Q125 steel grade oil casing produced by the technology is excellent in comprehensive performance, and has excellent high toughness and high plasticity.

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