冷轧优碳钢重卷断带分析与改善措施  

Analysis and improvement measures of rewinding broken tape of cold rolled carbon steel

作　　者：孙乾 杨建东 刘珊珊 亓伟伟 李承 潘爱东 SUN Qian;ANG Jiandong;LIU Shanshan;QI Weiwei;LI Cheng;PFAN Aidong(Laiwu Branch,Shandong Iron and Steel Co.,Ltd.,Ji'nan 271104,China;Marketing Headquarters,Shandong Iron and Steel Co.,Ltd.,Ji'nan 271104,China)

机构地区：[1]山东钢铁股份有限公司莱芜分公司,山东济南271104 [2]山东钢铁股份有限公司营销总公司,山东济南271104

出　　处：《物理测试》2024年第3期38-43,共6页Physics Examination and Testing

摘　　要：针对某锯片企业生产过程中,冷轧基料用65Mn热轧钢带纵剪后重卷过程中出现的脆性断裂问题,通过成分分析、金相观察、布氏硬度检测等手段对其失效原因综合分析。结果表明,脆断钢带的化学成分、拉伸性能满足标准要求,布氏硬度244~271HBW,局部波动大,组织以珠光体为主,晶粒度6.5~7级,存在网状或半网状铁素体包裹珠光体现象,导致晶界能降低,是造成脆性断裂的主要原因。通过热轧卷充分缓冷或退火,可显著改善脆断现象;后续钢带冷轧前先进行预退火,减小钢带变形抗力,轧制力稳定在10~14 MN,可显著提高冷轧效率及性能稳定性。In view of the brittle fracture problem of 65Mn hot rolled steel strip for cold rolling base material in the process of sliting and rewinding during the production of a saw blade enterprise,the failure reasons were comprehensively analyzed by means of composition analysis,metallographic observation and Brinell hardness test.The results showed that the chemical composition and tensile properties of the brittle fracture steel strip could meet the standard requirements.The Brinell hardness was 244-271HBW with large local fluctuations.The structure was mainly in pearlite with grain size of grade 6.5-7.There was a network or semi network ferrite wrapped pearlite phenomenon,leading to the decrease of grain boundary energy,which was the main cause of brittle fracture.By fully slow cooling or annealing hot rolled coils,the phenomenon of brittle fracture could be significantly improved.Pre-annealing was performed before cold rolling of subsequent steel strips to reduce deformation resistance.The rolling force was stabilized at 10-14 MN,which could significantly improve the cold rolling efficiency and performance stability.

关 键 词：65Mn 冷轧 脆性断裂 缓冷 珠光体 退火 

分 类 号：TG335.12[金属学及工艺—金属压力加工] TG115