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重轨钢大方坯连铸凝固规律的研究
Continuous Casting Solidification Rules of Heavy rail Steel Bloom
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- DOI:
- 作者:
- 成日金1，倪红卫1，张华1，易卫东2，叶途明2，李熠1
- 作者单位:
- 1.武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室，湖北 武汉 430081；2.武汉钢铁（集团）公司第一炼钢厂，湖北 武汉 430083
- 关键词:
- 重轨钢；大方坯；凝固终点；数值模拟；射钉法
Heavy rail steel; Bloom; Final stage of solidification; Numerical simulation; Pinshooting technique
- 摘要:
- 根据武钢第一炼钢厂重轨钢实际生产条件，建立大方坯凝固传热数学模型，并采用射钉法验证及修正。结果表明：U71Mn重轨钢凝固终点在距结晶器液面16.96~21.68 m处；拉速增大0.1 m/min，铸坯表面温度及空冷区中心温度明显增大，铸坯凝固终点后移2.4~3.6 m；二冷强度由弱冷降为超弱冷，铸坯表面温度升高，铸坯中心温度变化不大，凝固终点前移1.12~2.23 m；U71Mn重轨钢浇铸宜采用超弱冷模式，使凝固终点更加靠后，有利于使用轻压下工艺，提高铸坯的内部质量。
A solidification heat transfer mathematical model of heavy rail steel bloom was established based on practical production conditions bloom continuous caster in No.1 steelmaking plant of WISCO. Besides, it was tested and modified by pinshooting technique. The results show that the final stage of solidification of U71Mn heavy rail steel is far 16.96～21.68 m from mold liquid level. With increasing 0.1 m/min casting speed, surface temperature and centre temperature of bloom increase obviously, and the final stage of solidification shifts 4.72 m backward. After adjusting the intensity of secondary cooling weakly, surface temperature of bloom increases clearly, but centre temperature of casting blank has no change obviously, and the final stage of solidification shifts 1.12～2.23 m forward. So, weak intensity of secondary cooling is more suitable for U71Mn heavy rail steel.