65Mn热轧带钢开裂缺陷分析及控制
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摘要
针对65Mn热轧带钢在生产过程中出现的开裂缺陷,从成分分析、检测、原理、试验几个完整的方面进行研究,主要包括化学成分检验、金相分析、开裂断口扫描、显微硬度检测及轧后冷却方式试验对比。结果表明,马氏体相变产生的内应力超过了带钢的抗拉强度是导致65Mn带钢表面开裂的主要原因。针对该问题,通过增加侧喷吹扫能力、提高层冷冷却均匀性、避免堆冷轧后冷却工艺等措施,避免了带钢发生局部过冷及马氏体相变,解决了65Mn热轧带钢的开裂缺陷,满足了下游用户的应用需求。
For the cracking defects of 65 Mn hot rolled strip in the production process,the researches were carried out from the aspects of composition analysis,detection,principle and experiment,mainly including chemical composition inspection,metallographic analysis,crack fracture scanning,micro-hardness test and experimental comparison of cooling methods after rolling.The results showed that cracking defects were caused by the internal stress produced by martensitic transformation,which exceeded the tensile strength of the steel strip.Aiming at this problem,through increasing the ability of side spraying,improving the cooling uniformity of the layer and avoiding stack cooling process,the local supercooling and martensitic transformation were avoided,the cracking defects of 65 Mn hot rolled strip were solved and make the quality of 65 Mn meet the application requirements of downstream users.
For the cracking defects of 65 Mn hot rolled strip in the production process,the researches were carried out from the aspects of composition analysis,detection,principle and experiment,mainly including chemical composition inspection,metallographic analysis,crack fracture scanning,micro-hardness test and experimental comparison of cooling methods after rolling.The results showed that cracking defects were caused by the internal stress produced by martensitic transformation,which exceeded the tensile strength of the steel strip.Aiming at this problem,through increasing the ability of side spraying,improving the cooling uniformity of the layer and avoiding stack cooling process,the local supercooling and martensitic transformation were avoided,the cracking defects of 65 Mn hot rolled strip were solved and make the quality of 65 Mn meet the application requirements of downstream users.
引文
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[2]孙继兵,李国彬,李桂云,等.65Mn钢圆锯片基体的热处理[J].金属热处理,1999,24(11):17.
[3]亓伟伟.生产工艺对65Mn冷轧宽钢带力学性能的影响[J].中国冶金,2015,25(5):23.
[4]晁月林,张玮,邓素怀,等.低温轧制提高65Mn盘条塑韧性能机理分析[J].钢铁,2017,52(6):83.
[5]杨晓江.唐钢薄板坯连铸高碳钢65Mn的质量控制[J].中国冶金,2016,26(12):36.
[6]王有铭,李曼云,韦光.钢材的控制轧制和控制冷却[M].北京:冶金工业出版社,2005.
[7]鲁宪红.65Mn窄带钢缺陷分析及控制[J].河北冶金,2013(7):36.
[8]王跃华,宋进英,魏英立,等.热轧窄带65Mn钢珠光体组织与性能的窄范围控制[J].钢铁钒钛,2017,38(2):150.
[9]顾立业,张秉青.65Mn钢板开裂原因分析[J].河北冶金,2013(9):8.
[10]蔡珍,韩斌,谭文,等.热轧工艺对高碳带钢的组织和力学性能的影响[J].塑性工程学报,2016(1):58.
[11]杜海军,赵德文,杜林秀,等.温度参数对铌微合金高强度结构钢组织性能的影响[J].钢铁研究学报,2010(6):35.
[12]李秀景,侯明山,张星,等.薄板坯连铸连轧生产65Mn钢常见缺陷浅析[J].冶金信息导刊,2016(3):31.
[13]李大航,沙庆云.卷取温度和卷取后冷速对Nb-V-Ti微合金钢组织的影响[J].上海金属,2014,36(6):20.