ER50-6焊丝盘条拉拔断裂原因分析与控制优化  

Cause analysis and optimization of drawing fracture for ER50-6 gas shielded wire rod

作　　者：秦哲 代春朵 荆涛 杜黎明 黄健 李江文 武甲文 田伟阳 QIN Zhe;DAI Chunduo;JING Tao;DU Liming;HUANG Jian;LI Jiangwen;WU Jiawen;TIAN Weiyang(State Key Laboratory of Metal Materials for Marine Equipment and Application,Anshan 114009,Liaoning,China;Ansteel Beijing Research Institute Co.,Ltd.,Beijing 102200,China;Benxi Beiying Iron and Steel Group Co.,Ltd.,Benxi 117017,Liaoning,China)

机构地区：[1]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114009 [2]鞍钢集团北京研究院有限公司,北京102200 [3]本溪北营钢铁(集团)股份有限公司,辽宁本溪117017

出　　处：《中国冶金》2025年第2期55-64,共10页China Metallurgy

基　　金：国家重点研发计划资助项目(2021YFB3702005)。

摘　　要：针对ER50-6气保焊丝盘条在拉拔过程中出现的断丝率过高问题,通过金相显微镜(OM)、扫描电镜(SEM)、CCT曲线热模拟测定等研究方法,分析了盘条微观组织、断口形貌及相转变规律。研究结果表明,盘条微观组织均匀性差,存在轻微混晶及少量贝氏体组织,致使焊丝拉拔过程中变形能力不协调,是拉拔断裂的主要原因。基于此,结合产线装备能力,对焊丝钢控轧控冷工艺进行优化,将精轧开轧温度由(880±20)℃提高至(920±20)℃,风冷辊道冷却速度不高于0.5℃/s。工艺优化后,轧材组织混晶问题得到了解决,同时避免了贝氏体组织的大量产生,拉拔断丝率由大于1.2次/t降低至小于0.6次/t,极大提升了产品市场竞争力。Aiming at the high breaking rate of ER50-6 gas shielded wire rod in the process of drawing.Optical microscopy(OM),scanning electron microscopy(SEM),and continuous cooling transformation(CCT)curve thermal simulation measurement were employed.The microstructure,fracture morphology and phase transformation behavior of ER50-6 steel were analyzed.The research findings indicate that the microstructure of the wire spool exhibits poor uniformity,with slight mixed crystals and a small amount of bainite microstructure.This lack of uniformity leads to inconsistent deformation ability during wire drawing,which is the primary cause of fracture during the drawing process.Based on this,the controlled rolling and cooling process was optimized,the finishing rolling temperature was increased from(880±20)℃to(920±20)℃.Meanwhile,the cooling rate in air cooled roller conveyor should be less than 0.5℃/s.After process optimization,the microstructure uniformity was improved,and the formation of mixed crystals and a large number of bainite were avoided.Consequently,the rate of broken wires during the drawing process decreased from more than 1.2 times per ton of steel to less than 0.6 times per ton of steel,enhancing the competitiveness of the product in the market.

关 键 词：ER50-6焊丝盘条 珠光体 CCT曲线 控轧控冷 拉拔断裂 

分 类 号：TG3[金属学及工艺—金属压力加工]