45钢热轧盘条拉拔断裂原因分析与控制  

Cause analysis and control of fracture of 45 steel hot rolled wire rod during drawing

作　　者：孙增淼 张育明 邸永田 王刚 张旭 崔延文 SUN Zengmiao;ZHANG Yuming;DI Yongtian;WANG Gang;ZHANG Xu;CUI Yanwen(Hebei Xinggang Technology Co.,Ltd.,Xingtai 054799,China;Xingtai Iron and Steel Co.,Ltd.,Xingtai 054027,China;Hebei Wire Engineering Technology Innovation Center,Xingtai 054027,China)

机构地区：[1]河北邢钢科技有限公司,河北邢台054799 [2]邢台钢铁有限责任公司,河北邢台054027 [3]河北省线材工程技术创新中心,河北邢台054027

出　　处：《轧钢》2024年第6期131-135,共5页Steel Rolling

摘　　要：针对ϕ6.5 mm规格45钢热轧盘条拉拔断裂的问题,对45钢热轧盘条化学成分、显微组织及断口形貌进行了研究,分析了45钢盘条拉拔断裂的原因并提出了工艺改进措施。结果表明:45钢热轧盘条表面金相组织不均匀,存在混晶组织,组织中铁素体比例偏高是造成其拉拔断裂的主要原因。将45钢碳质量分数由0.43%~0.45%提高至0.46%~0.48%,进精轧温度由945℃降低至915℃,吐丝温度由940℃降低至890℃,风机数量由1^(#)~7^(#)开启调整为1^(#)~9^(#)开启,斯太尔摩风冷辊道起始段辊道速度由0.70 m/s提高至0.85 m/s(后续各辊道段速度依次递增),有效改善了45钢热轧盘条的金相组织,珠光体比例明显增加,提高了45钢热轧盘条的拉拔性能。The chemical composition,microstructure,and fracture morphology of 45 steel hot rolled wire rods were studied to resolve the problem of drawing fracture.The reasons of the drawing fracture of 45 steel were analyzed,and process improvement measures were proposed.The results indicate that the uneven microstructure and mixed crystals on the surface of 45 steel hot rolled wire rod,as well as the high proportion of ferrite in the microstructure,are the main reasons for the drawing fracture of 45 steel wire rod.The carbon mass fraction of 45 steel was increased from 0.43%-0.45%to 0.46%-0.48%,the finishing rolling temperature was reduced from 945℃to 915℃,the wire feeding temperature was reduced from 940℃to 890℃,the number of fans was adjusted from 1^(#)-7^(#)to 1^(#)-9^(#),and the starting roller speed of Stelmor air-cooled roller was increased from 0.70 m/s to 0.85 m/s(the speed of each subsequent roller section increased sequentially),effectively improving the microstructure of 45 steel hot rolled wire rod,significantly increasing the proportion of pearlite,and improving the drawing performance of 45 steel hot rolled wire rod.

关 键 词：45钢 热轧盘条 拉拔断裂 混晶 工艺优化 

分 类 号：TG3[金属学及工艺—金属压力加工]