26.4mm厚规格X80HD2管线钢的开发

Development of 26.4 mm Thick Specification X80HD2 Pipeline Steel

以低C高Mn为基础,添加Nb、Cr、Ni、Ti、Cu等合金进行合金体系设计,采用洁净钢冶金技术,通过强化并结合两阶段轧制和ACC多路径层流冷却工艺来保证钢板的强度和高韧性,开发了大应变X80HD2管线钢。钢板具有铁素体＋贝氏体双相组织,横向屈服强度470-568 MP,抗拉强度660-760 MPa,屈强比0.65-0.79;纵向屈服强度455-540 MPa,抗拉强度660-727 MPa,屈强比0.64-0.77;Rt1.5/Rt0.5均〉1.13,Rt2.0/Rt1.0均〉1.06。各项强度指标满足标准要求,各项性能指标呈正态分布。结合新开发的制管工艺,使批量生产的X80HD2抗大变形焊管具有良好的强度、大的均匀伸长率和应力比等优点。

Based on low C and high manganese content, Nb, Cr, Cu, Ni, Ti and other Alloying elements were added for design the alloy system. Using clean steel metallurgy technology alloy system, strengthening and combining with the two stage rolling and ACC multi path laminar cooling process to ensure the strength and toughness, the X80HD2 steel plate with the large strain was developed. The transverse yield strength of the steel plate with ferrite ＋ bainite dual phase structure is 470-568 MPa, the transverse tensile strength is 660-760 MPa and the Rt0.5/Rm is 0.65-0.79. The longitudinal yield strength of the plate is 455-540 MPa, the longitudinal tensile strength is 660-727 MPa and the R,t0.5/Rm is 0.64-0.77, the Rt1.5/Rt0.5 is more than 1.13 and the Rt2.0/Rt1.0 is more than 1.06. All the intensity indexes meet the requirements of the Standard and the performance indexes show a normal distribution. Combing with the newly developed pipe manufacture process, the X80HD2 welding pipe with anti deformation property put into mass production have good strength and large uniform elongation and stress ratio.