70钢扁钢丝冷轧开裂原因分析  

Analysis of cold rolling cracking of 70 steel flat wire

作　　者：姜婷[1] 汪开忠[1] 于同仁[2] 张晓瑞[1] 余良其 Jiang Ting;Wang Kaizhong;Yu Tongren;Zhang Xiaorui;Yu Liangqi(Maanshan Iron&Steel Company Ltd.,Maanshan 243000,China)

机构地区：[1]马鞍山钢铁股份有限公司技术中心,安徽马鞍山243000 [2]马鞍山钢铁股份有限公司,安徽马鞍山243000

出　　处：《金属制品》2021年第3期47-49,共3页Metal Products

摘　　要：对70钢热轧盘条生产扁钢丝时在冷轧过程中出现的开裂问题进行分析。通过对断口进行扫描电镜分析、金相组织观察,确认原因为前一道次的等温球化退火工艺控制不当,导致组织过热,出现脆相的棱角形渗碳体和粗片状珠光体,而后在冷轧时沿碳化物晶界开裂。调整球化退火工艺后解决了冷轧开裂问题。To analyze cracking problem of flat wire produced by 70 steel hot rolled wire rod during cold rolling.By means of SEM analysis and microstructure observation of fracture surface,the reason is improper control of isothermal spheroidizing annealing process in previous pass,which leads to overheating of microstructure and formation of brittle phase angular cementite and coarse pearlite,and then cracks along carbide grain boundary during cold rolling.After adjusting spheroidizing annealing process,the cold rolling cracking problem was solved.

关 键 词：70钢 扁钢丝 冷轧 开裂 球化退火 

分 类 号：TG162.8[金属学及工艺—热处理]