卷取温度对150 ksi超高强度焊管卷板组织和性能的影响

Effect of Coiling Temperature on Microstructure and Properties of Plate Bending of 150 ksi Ultra-high Strength Welded Pipe

为满足深井和超深井油气开发对高强度焊管的需求,采用低碳微合金化成分设计+TMCP工艺,开发了150 ksi钢级焊管专用钢,并研究了卷取温度对卷板组织和性能的影响。结果显示:随着卷取温度升高,卷板马氏体含量呈现下降趋势,材料的强度下降,塑性和韧性随之上升;在卷取温度为550℃条件下,卷板的屈服强度为740 MPa,抗拉强度为1103 MPa,延伸率为17%,达到设计要求,具有良好的强塑性。用其制造Φ50.8 mm×4.0 mm的焊管,管材屈服强度为1078 MPa,抗拉强度为1141 MPa,延伸率为21%,均达到了150 ksi钢级焊管的设计要求。

In order to meet the demand of high strength welded pipe in deep and ultra-deep wells,150 ksi steel is developed by using low carbon microalloying composition design+TMCP process,and the influence of coiling temperature on the microstructure and properties of the plate bending is studied.The results show that with the increase of coiling temperature,the content of martensite in steel decreases,the strength of the material decreases,and the plasticity and toughness increase.Under the coiling temperature of 550℃,the yield strength of the platebending is 740 MPa,the tensile strength is 1103 MPa,and the elongation is 17%,which meets the design requirements and has good strong plasticity.TheΦ50.8 mm×4.0 mm welded pipemade of the plate bending has a yield strength of 1078 MPa,a tensile strength of 1141 MPa and a elongation of 21%,all of which meet the design requirements of 150 ksi steel grade welded pipe.