钒钛微合金化对建筑用钢成形性能的影响

Influence of vanadium titanium microalloying on formability for construction steel

在Q235建筑用钢中复合添加不同含量的合金元素钒和钛,并进行了准静态拉伸试验、杯突试验、扩孔试验以及显微组织分析。结果表明:复合添加适量的合金元素钒和钛,可以明显改善合金内部组织、提高合金拉伸性能、胀形成形性能和冲压成形性能。合金元素含量过低或过高,均不利于钢板试样获得理想的内部组织和成形性能。与不添加合金元素的Q235建筑用钢相比,当复合添加0.15%V和0.1%Ti时钢的抗拉强度增大了33 MPa、屈服强度增大了35 MPa、断后伸长率增大了2.3%、应变硬化指数增大了0.078、杯突值增大了2.2、扩孔率增大了26.1%。

The alloying elements of vanadium and titanium with different contents were added into construction steel Q235,and quasi-static tensile test,cupping test,hole reaming test and microstructure analysis were conducted.The results show that the microstructure,tensile property,bulging formability and stamping formability of the alloy are significantly improved by adding a proper amount of alloying elements of vanadium and titanium.However,too low or too high content of alloying elements is not conducive to obtaining ideal internal structure and formability of the steel plate samples.But,compared with the construction steel Q235 without adding alloying elements,when the steel is added with 0.15%V and 0.1%Ti,the tensile strength,yield strength,elongation after fracture,strain hardening index,cupping value and hole reaming rate of the steel are increased by 33 MPa,35 MPa,2.3%,0.078,2.2 and 26.1%,respectively.