Effect of tempering temperature on microstructure and properties of an oil casing steel used for deep wells
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借助光学显微镜(OM)、扫描电镜(SEM)、拉伸试验机等设备研究了 920℃淬火后回火温度对某深井石油套管钢微观组织和力学性能的影响.结果表明,试验钢在500～600℃回火得到回火索氏体,具有较高的强塑性与韧性,强塑积的波动范围为20.5～22.1 GPa·％,冲击吸收能量波动范围为94.6～100.3 J;当回火温度为550℃时,深井油套管试验钢具有最佳的综合力学性能,此时抗拉强度为978 MPa,屈服强度为935 MPa,强塑积为22.1 GPa·％,冲击吸收能量为100.3 J.
Effect of tempering temperature on the microstructure and mechanical properties of a deep well oil casing steel quenched at 920℃was studied by means of optical microscope(OM),scanning electron microscope(SEM)and tensile testing machine.The results show that the experimental steel obtains tempered martensite structure after tempered at 500-600 ℃,which has high product of strength and elongation and high toughness,where the product of strength and elongation is ranged from 20.5 to 22.1 GPa·％,and the impact absorbed energy is ranged from 94.6 to 100.3 J.When the tempering temperature is 550℃,the deep well oil casing experimental steel has the best comprehensive mechanical properties,with tensile strength of 978 MPa,yield strength of 935 MPa,and product of strength and elongation of 22.1 GPa·％,impact absorbed energy is 100.3 J.
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