通过中碳低合金的思路设计了Q125钢级SEW石油套管用钢,同时研究了调质热处理工艺对其组织和力学性能的影响.结果表明:采用880℃淬火+ 540℃回火调质处理后,SEW Q125石油套管具有更好的强韧性配合,屈服强度975 MPa,抗拉强度1030 MPa,伸长率23％,0℃母材纵向冲击功不低于150 J,母材横向冲击功不低于120 J,焊缝冲击功不低于100 J,抗外压挤毁值高于标准要求30％,沟槽腐蚀性能不敏感,具有良好综合力学性能和耐蚀性.据此提出的推荐热处理工艺制度,在工业试制中应用,各项性能指标均达到API 5CT的要求.
Effects of heat treatment process on microstructure and mechanical properties of the medium carbon microalloyed Q125 grade SEW oil casing steel were investigated.The yield strength of 975 MPa,tensile strength of 1030 MPa and elongation of 23％ can be obtained for the steel quenched at 880 ℃ and tempered at 540 ℃.The longitudinal impact energy and transverse impact energy of the casing steel at 0 ℃ are higher than 150 J and 120 J,respectively,and the impact value of the weld is higher than 100 J.The anti collapse value of the steel casing is higher than the standard value by 30％,and the steel is not sensitive to grooving corrosion.The performances of the Q125 grade casing steel heat-treated by the recommended process in this paper fuifill the requirements of API 5CT.
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