N80级非调质油井管用钢36-40Mn2V连轧和定径工艺 对组织和性能的影响

通过Gleeble-1500热模拟机,模拟340机组36Mn2V和40Mn2V钢950～1 100℃,变形量0.5～0 8.变形速度1.0 s^-1,水冷和3℃/s冷却的连轧工艺与800～950℃,变形量0.10～0.30,变形速度0.5 s^-1,空冷的定径工艺对组织和硬度的影响。结果表明,36Mn2V和40Mn2V钢连轧变形温度和变形量分别大于1 050℃和0.5时可发生完全动态再结晶,细化晶粒和提高产品综合性能;36Mn2V钢管定径变形量0.3时,40Mn2V钢定径变形量为0.2时,应控制定径温度大于835℃,才能满足力学性能要求。

Effect of Multi-Stand Pipe Mill Rolling and Sizing Process on Structure and Property of N80 Non-Quenching and Tempering Steel 36-40Mn2V for Oil Well Pipe

The effect of 340 multi-stand pipe mill（MPM） continuous rolling process(at 950～1100℃with strain 0.5～0.8,strain rate 1.0 s^-1,water or 3℃/s cooling) and sizing process(at 800～950℃,with strain 0.1～0.3, strain rate 0.5 s^-1,air cooling) on structure and hardness oi steel 36Mn2V and 40Mn2V has been simulated by using Gleeble-1500 thermal simulation machine.Results show that with MPM deformation temperature being higher than 1 050℃at strain 0.5,the complete dynamic recrystallization of steel 36Mn2V and 40Mn2V occurs,the grains are fine and the comprehensive properties are improved;As sizing strain of steel 36Mn2V is 0.3 and sizing strain of steel 40Mn2V is 0.2,as the sizing temperature is controlled higher than 835℃,the mechanical properties can meet requirement of standard.