针对南钢部分合金结构钢棒材存在的硬度偏硬、影响锯切的问题，详细分析了硬度超标的影响因素，利用Gleeble热模拟试验研究了终轧温度对成品硬度的影响，采用合理调整钢材化学成分及电磁搅拌参数，控制自由氮含量，降低终轧温度，提高入坑温度等措施，将合金结构钢硬度降低到HB240以下，降低了碳成分偏析，碳质量分数极差由0.08%降低到0.04%，从而较大程度上改善了南钢合金结构钢切割加工性能。
Since constructional alloy steel bar of Nanjing Steel Group is difficult to be cut for downstream customers, various factors for inducing high hardness are analyzed. Gleeble experiment is conducted to study the effect of finish rolling temperature on the hardness of rolled bar. The hardness was reduced successfully below HB240 and segregation extent was also decreased by adjusting the chemical composition and electromagnetism agitation parameter. By controlling the free nitrogen content, the finish rolling temperature was reduced and the temperature of entering the burial pit was increased. The cutting performance was greatly improved and the extreme difference of carbon content was decreased from 0.08% to 0.04%.
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