钛对焊接用钢ER50-G盘条强度的影响

Influence of Titanium on Strength of Weldable Wire Rod ER50-G Steel

对首钢焊接用钢ER50-G盘条的化学成分、力学性能、微观组织及析出的含钛化合物进行检测和统计,分析钛作用于盘条微观组织、析出相等因素,及对盘条强度产生的影响。结果表明:钛加入ER50-G钢中后,形成大量含钛化合物并析出,细化了盘条的显微组织,同时产生显著的沉淀强化效果,综合作用下ER50-G盘条抗拉强度的增量最大超200 MPa;试验证明控制含钛化合物的析出行为,降低和稳定沉淀强化对盘条强度的贡献,有利于控制盘条强度及其均匀性,优化盘条拉拔性能。

The chemical compositions,mechanical properties,microstructure and precipitates of the weldable wire rod ER50-G produced by Shougang were detected and analyzed statistically in this study. The influence of titanium on the microstructure and precipitates of ER50-G and therefore the tensile strength wire were analyzed. The results showed that a large number of titanium-containing compounds formed and precipitated in ER50-G wire steel. These particles helped to refine the microstructure of ER50-G wire,and also brought significant precipitation strengthening contribution to ER50-G wire. The increment of tensile strength induced by titanium-containing precipitates could be more than 200 MPa. Well control the precipitation behavior,especially decreasing and stablising the precipitation strengthening effects,had been proved to be beneficial of improving the drawing performance of ER50-G wire.