塑料模具钢SM50钢板表面裂纹成因及控制措施

详细信息    查看全文 | 推荐本文 |

英文篇名：Cause and control measures of plate surface cracks for plastic mould steel SM50 作者：张锦兴 ; 孔明姣 ; 任树洋 ; 马建锋 ; 吴建国 英文作者：ZHANG Jin-xing;KONG Ming-jiao;REN Shu-yang;MA Jian-feng;WU Jian-guo;Tangshan Medium and Thick Plate Co.,Ltd.; 关键词：模具钢 ; 表面裂纹 ; 热装裂纹 ; 铸坯缓冷 ; 控制措施 英文关键词：mould steel;;surface crack;;thermal charging crack;;slab slowly cooling down;;control measures 中文刊名：ZGYE 英文刊名：China Metallurgy 机构：唐山中厚板材有限公司; 出版日期：2019-04-15 出版单位：中国冶金 年：2019 期：v.29 语种：中文; 页：ZGYE201904013 页数：5 CN：04 ISSN：11-3729/TF 分类号：73-77

摘要

针对唐山中厚板材有限公司塑料模具钢SM50钢板表面裂纹缺陷,采用生产工艺情况调查、能谱分析和金相分析相结合的方法,对裂纹产生的原因进行了深入分析。结果表明,SM50钢板表面裂纹缺陷并非铸坯原生裂纹导致,而是由于连铸坯在处于两相区时热装,铸坯晶粒度极不均匀导致的热装裂纹。通过改进现有工艺,提出了对铸坯进行下线缓冷、温装入炉的改进措施。新工艺实施后,SM50钢热装裂纹缺陷比例由原来的4.24%下降到0.30%以下,钢板表面裂纹率大幅降低。
        Aiming at the crack defect on the plate surface of plastic mold steel SM50 in Tangshan steel,the causes of crack were analyzed in depth by means of production process investigation,energy spectrum analysis and metallographic analysis.The result showed that the surface crack defect of SM50 steel plate was not caused by the original cracks of the casting slab,but the hot-packed crack caused by the extremely uneven grain size of the cast slab due to the hot-filling of the continuous casting billet in the two-phase region.Through improving the existing production process,the improvement measures of slow cooling and warm loading of casting billet into the furnace were proposed.After the new process was implemented,the proportion of cracks in the hot-packed crack of SM50 steel decreased from 4.24%to less than 0.30%,and the surface crack rate of steel plate decreased significantly.

引文

[1]陈再枝,马党参.我国模具钢的发展战略分析[J].钢铁,2006,41(4):5.
    [2]崔崑.国内外模具用钢发展概况[J].金属热处理,2007(1):1.
    [3]王琳,秋立鹏,汝亚彬,等.塑料模具钢大型预硬化模块的研究[J].中国冶金,2011,21(12):24.
    [4]吴晓春,张铮.中低碳微合金塑料模具钢研究现状与进展[J].模具工业,2013,39(6):1.
    [5]郭永民,李龙.中厚板表面爪型裂纹成因分析[J].天津冶金,2013(增刊1):47.
    [6]刘志明,张炯明,罗衍昭.热装热轧微合金钢板表面裂纹分析[J].钢铁,2012,47(2):67.
    [7]罗衍昭,张炯明,肖超,等.热装微合金化中厚板表面裂纹的研究现状[J].炼钢,2011,27(4):74.
    [8]赵乾,朱伏先,崔凤平,等.中厚板表面裂纹缺陷分析及控制[J].轧钢,2006(2):42.
    [9]郭辉,马静超.中厚板表面片状开裂原因分析及控制[J].中国冶金,2017,27(9):54.
    [10]王国连,曹磊.宽厚板连铸坯中间裂纹成因分析及控制[J].中国冶金,2017,27(10):54.
    [11]王高田.中厚钢板表面裂纹产生原因分析[J].轧钢,2006(3):58.