高Nb、Ti含量钢坯开裂原因分析及控制措施

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Analysis on Formation of Cracks in High Nb and Ti Content Billet and Control Measures

1. College of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;
2. Research & Development Center of WISCO, Wuhan 430080, Hubei, China;
3. No. 2 Steelmaking Plant of WISCO Co., Ltd., Wuhan 430083, Hubei, China;
4 No. 2 Hot Rolling Plant of WISCO Co., Ltd., Wuhan 430083, Hubei, China

摘要: 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。
- 高Nb、Ti钢 /
- 钢坯 /
- 开裂 /
- 热塑性
Abstract: The causes of cracks in high Nb and Ti content billet in the process of steel rolling was investigated by pickling,metallography detection and energy spectrum analysis.The results show that the direct reason for crack forming is the inner microcracks caused by large amount of carbonitride separated out in the process.It is proved in the thermoplasticity test that there is a brittleness temperature range at 660~910℃ for the steel.The cracks can be avoided through controlling chemical compositions,stabilizing the casting speed and liquid level in the mold,and reducing the cooling rate in the secondary cooling.
- steel with high Nb and Ti content /
- billet /
- crack /
- thermoplasticity