400 mm特厚板坯尾坯浇铸工艺的研究
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摘要
板坯尾坯浇注为非稳态浇注过程,400 mm特厚板坯尾坯常伴随着表面横裂纹和中心缩孔质量缺陷。研究了不同的尾坯浇注拉速工艺和尾坯封顶工艺对特厚板坯尾坯质量的影响。结果表明:控制尾坯浇铸拉速v<0.5 m/min的时间t<5 min,使得矫直区尾坯表面温度在910℃以上,能够有效降低铸坯的表面横裂纹;尾坯采用无水封顶工艺,能够有效降低铸坯的中心缩孔。通过采取有效措施,特厚板坯尾坯废品量由改善前的月平均242 t降低到月平均30 t,降低了87.9%;尾坯中心缩孔长度由(3.0～3.5)m缩短到(1～2)m,效果明显。
Casting of tail slab is an unsteady casting process,the tail slab of 400 mm thick slab is often accompanied by quality defects such as surface transverse crack and central shrinkage cavity. This paper investigated the influence of cast speed and anhydrous capping process on quality of the tail slab. The results show that when the time of process with casting speed of tail slab v<0.5 m/min is less than 5 min,the surface temperature of slab in straightening zone reach above 910 ℃. This can effectively reduce the surface transverse crack of the tail slab. If the end of the cast uses anhydrous capping process,the central shrinkage cavity of the tail slab can be elimited effectively. By taking measures,the amount of waste of tail slab has decreased from 242 tons per month to 30 tons per month,which was reduced by 87.9%. The length of the central shrinkage cavity of the tail slab was significantly shortened from 3.0-3.5 m to 1-2 m.
Casting of tail slab is an unsteady casting process,the tail slab of 400 mm thick slab is often accompanied by quality defects such as surface transverse crack and central shrinkage cavity. This paper investigated the influence of cast speed and anhydrous capping process on quality of the tail slab. The results show that when the time of process with casting speed of tail slab v<0.5 m/min is less than 5 min,the surface temperature of slab in straightening zone reach above 910 ℃. This can effectively reduce the surface transverse crack of the tail slab. If the end of the cast uses anhydrous capping process,the central shrinkage cavity of the tail slab can be elimited effectively. By taking measures,the amount of waste of tail slab has decreased from 242 tons per month to 30 tons per month,which was reduced by 87.9%. The length of the central shrinkage cavity of the tail slab was significantly shortened from 3.0-3.5 m to 1-2 m.
引文
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[2]毛敬华,王水根,占贤辉.机型与防止特厚板坯表面裂纹的关系[J].钢铁技术,2014(1):19.
[3]蔡开科,党紫九.连铸钢高温力学性能专辑[J].北京科技大学学报,1993,15(2):3.
[4]赵新宇.特厚板坯头坯表面质量控制技术研究[N].世界金属导报,2016-09-13(B03).
[5]甄新刚,朱志远,杨建平,等.首秦公司特厚板坯表面横裂纹的形成机制[J].钢铁,2013,48(6):29.
[6]朱志远,甄新刚,蒋海涛,等.400 mm特厚板坯表面横裂纹控制技术[J].钢铁,2011,46(12):33.
[7]孟娜,朱立光,朱新华.连铸坯中心缩孔研究与控制[J].河北联合大学学报:自然科学版,2014,36(3):41.