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采用酸洗、金相检测、能谱分析等方法,对高Nb、Ti含量钢坯在轧钢过程中的开裂原因进行研究,结果表明:大量析出的碳氮化物引起的内部微裂纹是造成高Nb、Ti含量钢开裂的直接原因。高温热塑性试验证实,高Nb、Ti含量钢在660～910℃下存在脆性温度区间。通过成分控制、稳定拉速、降低二冷段冷却速率以及稳定结晶器液面,可基本消除高Nb、Ti含量钢轧钢开裂现象。
The reason of cracking of high Nb and Ti content billets during rolling process was studied by pickling, metallographic examination and energy spectrum analysis. The results show that the internal microcracks caused by the large amount of precipitated carbonitrides are the cause of high Nb, Ti content of the direct cause of cracking steel. High-temperature thermoplastic test confirmed that high Nb, Ti content of steel in the presence of brittle temperature range 660 ~ 910 ℃. Through component control, stable drawing speed, lower cooling rate in the second cooling section, and stabilizing the liquid level in the mold, cracking phenomenon of steel rolling with high Nb and Ti content can be basically eliminated.