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:U71 Mn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;U71 Mn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 steel-making plant of WISCO. Besides, it was tested and modified by pin-shooting 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.
出处
《铸造技术》
CAS
北大核心
2010年第1期24-27,共4页
Foundry Technology
基金
教育部博士点基金(20050488001)
湖北省教育厅科研基金资助项目(2004Z001)
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
Pin-shooting technique
