65Mn方坯典型质量缺陷控制工艺研究
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摘要
针对某钢厂200 mm×200 mm的65Mn铸坯存在脱方、角部凹陷和三角区裂纹等质量问题,通过分析缺陷是由结晶器及二次冷却不均造成的,提出扩大结晶器铜管R角、锥度及增加二冷水量工艺优化方案,扩大结晶器铜管R角及锥度改善结晶器冷却传热,增加二冷水量提高足辊水压,使得二冷段喷淋冷却效果更好,提高铸坯冷却均匀性,铸坯脱方、角部凹陷和三角区裂纹等缺陷明显改善,铸坯质量得到大幅提高。
There is off-square,angle concaves and corner cracks in 200 mm square billet of 65 Mn in a certain steel plant,which are caused by the uneven cooling of mold and secondary cooling zone by analyzing. The process optimization schemes of enlarging the R Angle and the taper and increasing the secondary cooling water flow have been carried out. The method of enlarging the R Angle and the taper of the mold improve the heat transfer of the mold cooling. The increase of the secondary cooling water and the water pressure of the foot roller improve the cooling effect of the secondary cooling section. The cooling uniformity of casting billet has been increased. The test shows the quality problems of off-square,angle concaves and corner cracks have been controlled effectively and the quality of casting billet has been greatly improved.
There is off-square,angle concaves and corner cracks in 200 mm square billet of 65 Mn in a certain steel plant,which are caused by the uneven cooling of mold and secondary cooling zone by analyzing. The process optimization schemes of enlarging the R Angle and the taper and increasing the secondary cooling water flow have been carried out. The method of enlarging the R Angle and the taper of the mold improve the heat transfer of the mold cooling. The increase of the secondary cooling water and the water pressure of the foot roller improve the cooling effect of the secondary cooling section. The cooling uniformity of casting billet has been increased. The test shows the quality problems of off-square,angle concaves and corner cracks have been controlled effectively and the quality of casting billet has been greatly improved.
引文
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[8]曹磊,王国连,史志强,等.Nb-V-Ti微合金低碳钢Q550D250 mm×1 820 mm连铸板坯角部横裂纹的控制工艺[J].特殊钢,2017,38(5):47.
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[2]佐祥均,袁钢锦,阎建武.连铸过程中方钢脱方的原因与预防措施的研究[J].连铸,2015,40(5):29.
[3]王晓静.安钢小方坯脱方成因分析与预防措施[J].连铸,2002(4):37.
[4]杨桂荣.高速方坯连铸脱方的成因与对策[J].炼钢,1998(6):35.
[5]朱苗勇.现代冶金学(钢铁冶金卷)[M].北京:冶金工业出版社,2010:344.
[6]王志道.低倍检验在连铸生产中的应用和图谱[M].北京:冶金工业出版社,2009:15.
[7]杜国利,覃胜苗,杨正府,等.铸坯角裂纹控制方法研究[J].柳钢科技,2017(1):9.
[8]曹磊,王国连,史志强,等.Nb-V-Ti微合金低碳钢Q550D250 mm×1 820 mm连铸板坯角部横裂纹的控制工艺[J].特殊钢,2017,38(5):47.
[9]毛斌斌,范敏杰,曹艳锋,等.连铸坯低倍组织缺陷形成原因与控制措施分析[J].江苏科技信息,2018(8):36.
[10]许庆太,杨撷光,吴春雷,等.连铸坯内部裂纹缺陷的检验和分析[J].连铸,2015,40(5):1.