摘要:
介绍了某钢铁公司热连轧厂生产的HP295在用户加工使用过程中产生开裂的问题,针对这一问题,通过对力学性能和显微组织的分析,对化学成分及轧制工艺进行了优化,降低C、Mn及P含量,减少带钢的各向异性,同时采用终轧温度850~890℃,两段式冷却,卷取温度630~670℃,并根据季节变化适当微调的工艺,获得了较高比例的和细小均匀的铁素体以及弥散分布的珠光体组织,且屈强比也较低,使平均开裂率从约1%降低到0.3%。
Abstract:
Cracks have been found during deep processing of the HP295 supplied by a hot rolling plant of an iron ＆ steel company.In order to solve this problem,based on analysis of mechanical properties and microstructure of HP295,chemical compositions and rolling processes are optimized by lowering the content of C,Mn and P,reducing the anisotropy of the strip,and applying final rolling temperature of 850～890 ℃,two-stage cooling,coiling temperature of 630～670 ℃,which may be adjusted a little with seasons.Thus,higher proportion of finer and more uniform ferrite and more dispersive pearlite with lower yield ratio are obtained.As a result,the average cracking rate of HP295 is decreased from about 1% to 0.3%.
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