SPHC热轧板卷力学性能优化研究

Study on Optimization of Mechanical Properties of SPHC Hot Rolled Coil

为了解决SPHC热轧板卷屈服强度偏高的问题,从化学成分、工艺、组织和性能角度对屈服强度偏高的SPHC板卷进行了系统分析,结果表明,钢中C含量、残余(微)合金元素总量、轧制和冷却工艺是影响SPHC钢屈服强度的主要因素。经过对化学成分和工艺优化后,屈服强度≥270 MPa的SPHC板卷比例由33.3%降至10.0%,屈服强度<250 MPa的比例由16.7%提高至38.0%。解决了SPHC热轧板卷屈服强度偏高的问题。

In order to solve the problem that the yield strength of the SPHC hot rolled coil was high, the SPHC coil was analyzed systemically over its chemical compositions, processing line, microstructure and mechanical properties. The analytical results showed that the carbon content in steel, the total amount of residual （micro-alloying） alloying elements, the rolling process and cooling process were the main factors for influencing the yield strength of the SPHC steel. After optimizing the chemical compositions and processes, the proportion of the SPHC coils whose yield strengths were more than or equal to 270 MPa was reduced from 33.3% to 10% while those coils whose yield strengths were less than 250 MPa increased from 16.7% to 38.0% and therefore the problem that the yield strength of the SPHC hot rolled coil was solved.