35CrMoA钢力学性能不合格原因分析

Cause Analysis of Failure of Mechanical Properties of 35CrMoA Steel

35CrMoA钢由于主元素的成分设计不合理、连铸成分偏析,后序流程未彻底改善,导致部分产品调质后强度指标低于标准值(R_(p0.2)≥835 MPa,R_(m)≥980 MPa),其他塑性检验指标富余量也较低。通过调整成分,优化连铸工艺,提高加热炉均热温度和在炉时间,使合金钢35 CrMoA力学性能均达到了国标要求。

Due to the unreasonable composition design of the main elements, serious continuous segregation and the incompletely improvement after the order process, the strength index is resulted lower than the standard value （Rp0.2≥835 MPa, R≥980 MPa） and other plastic index surplus quantity is also less for some products of the 35CrMoA after quenching and tempering treatment. By adjusting the composition, optimizing the continuous casting process, improving the heating temperature and the reheating time in the fumace, the mechanical properties of the alloy steel 35CrMoA can meet the requirements of the national standard.