440MPa冷轧钢带的冲压开裂的原因分析  

Cause Analysis of Bending Cracking of 440 MPa Cold Rolled Steel Strip

作　　者：魏兵兵 孙乾 潘爱东 刘海波 李岩 WEI Bingbing;SUN Qian;PAN Aidong;LIU Haibo;LI Yan(Shandong Iron and Steel Co.,Ltd.,Jinan 271104,China)

机构地区：[1]山东钢铁股份有限公司,山东济南271104

出　　处：《山东冶金》2024年第5期11-12,15,共3页Shandong Metallurgy

摘　　要：针对440MPa冷轧钢带冲压开裂现象,采用光谱成分分析、金相显微镜微观组织观察、扫描电镜微观断口检验等分析手段对失效原因进行全面分析。结果表明,钢带成分、性能满足技术协议要求,钢带局部存在硫化物夹杂,在冲压过程中以夹杂为源头的应力集中,诱发了裂纹产生。通过向钢液中添加稀土元素、钙处理等方式,诱导夹杂物变性处理,或通过延长精炼搅拌时间,促进钢液中夹杂物上浮,可达到净化钢液、优化冲压性能的效果。In view of the stamping cracking phenomenon of 440 MPa cold rolled steel strip,the failure causes were comprehensively analyzed by means of spectral composition analysis,microstructure observation under metallographic microscope and microscopic fracture inspection under scanning electron microscope.The results show that the composition and properties of the steel strip meet the requirements of the technical agreement.There are sulfide inclusions in some parts of the steel strip.During the stamping process,the stress concentration of the inclusions as the source induces cracks.By adding rare earth elements and calcium treatment to the liquid steel,inducing the inclusion denaturing treatment,or extending the refining stirring time to promote the inclusion floating in the liquid steel,the effect of purifying the liquid steel and optimizing the stamping performance can be achieved.

关 键 词：440MPa 冷轧钢带 冲压 硫化物 夹杂物 

分 类 号：TG142.1[一般工业技术—材料科学与工程]