倒角结构对连铸坯角部温度的影响及角横裂控制工业试验  

Effect of chamfer structure on temperature of slab corner and industrial test for controlling transverse corner crack

作　　者：刘启龙[1,2] 陶红标[1] 张慧[1] 刘国平[2] 刘学华[3] 臧红臣[2] LIU Qilong1,2, TAO Hongbiao1, ZHANG Hui1, LIU Guoping2, LIU Xuehua3, ZANG Hongchen2(1. National Engineering ＆ Research Center of Continuous Casting Technology, CISRI, Beijing 100081, China ;2. The Fourth Steel-Rolling Mill of Maanshan Iron and Steel Co., Ltd., Maanshan 243001, China ;3. Technology Center of Maanshan Iron and Steel Co., Ltd., Maanshan 243001, Chin)

机构地区：[1]钢铁研究总院连铸技术国家工程研究中心,北京100081 [2]马鞍山钢铁股份有限公司第四钢轧总厂,安徽马鞍山243001 [3]马鞍山钢铁股份有限公司技术中心,安徽马鞍山243001

出　　处：《炼钢》2018年第2期31-37,共7页Steelmaking

摘　　要：以控制铌、钛微合金化钢板坯角部横裂纹为目标,在马鞍山钢铁股份有限公司板坯连铸机上开发并应用倒角结晶器技术。建立三维稳态传热模型,采用数值模拟的方法研究了倒角结构对连铸坯角部温度的影响,通过工业试验对比分析了不同角部形状板坯角部横裂纹的控制效果。数值模拟结果表明:铸坯角部由直角变为钝角后,角部温度明显提高;距弯月面900mm处,角部温度由788℃提高到1 091℃以上,铸坯宽面角部的角度分别为120°,125°,127°时,其角部温度依次为1 091,1 128,1 110℃,相应地铸坯窄面角部的温度依次为1 254,1 240,1 209℃。工业试验结果表明:采用倒角结晶器和二冷弱冷工艺后,角部横裂纹得到了有效控制,铸坯宽面角部的角度为125°时,角部横裂纹发生比例最低,铸坯质量满足热送直轧要求。Aiming at controlling slab transverse corner crack of microalloyed steel containing niobium or titanium,the chamfered mould technology has been developed and applied on the Masteel slab continuous caster.The effect of chamfer structure on temperature of slab corner has been studied by establishing three dimensional steady heat transfer model and using the method of numerical simulation.The control effect for corner transverse cracks of slabs with different angle shape has been compared and analyzed through the industrial tests.The numerical simulation results showed that the corner temperature was obviously increased when the slab angle was changed from a right angle to an obtuse angle.The slab corner temperature will be increased from 788 ℃ to 1 091 ℃above at a place where the distance from meniscus was 900 mm.The slab width corner temperature was 1 091 ℃,1 128℃and 1 110℃ when the slab width angle was 120°,125°and 127°respectively.Accordingly,the temperature of the slab narrow face angle was 1 254 ℃,1 240 ℃ and 1 209 ℃respectively.Industrial test results showed that transverse corner cracks has been effectively controlled by using chamfered mould and soft secondary cooling process.The transverse corner crack ratio was the lowest when the angle of the slab width chamfer was 125°and the slab quality could meet the need of hot charging and direct rolling.

关 键 词：倒角结晶器 微合金化钢 角部横裂纹 角部温度 角部形状 

分 类 号：TF777.1[冶金工程—钢铁冶金]