20MnSi热轧带肋钢筋冷弯断裂原因分析  

Fracture Analysis of Cold Bending 20MnSi Hot Rolling Ribbed Steel Bar

作　　者：张朝晖[1] 杨敏刚[1] 

机构地区：[1]f西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《热加工工艺》2013年第1期230-232,234,共4页Hot Working Technology

摘　　要：通过化学成分、金相观察、扫描电镜和EDS分析,对某钢公司生产的20MnSi热轧带肋钢筋出现的冷弯断裂现象进行了研究。结果表明:钢材中C、Si、Mn元素含量超标,存在非金属夹杂物、粒状贝氏体和魏氏组织是导致热轧带肋钢筋冷弯断裂的主要原因。结合生产工艺,论述了非金属夹杂物、化学成分、粒状贝氏体和魏氏组织对钢筋冷弯断裂的影响机理。By the observation and analysis of chemical composition, microstructure, SEM （scanning electron microscope） and EDS （energy dispersive X-ray spectrometry） , the cold bending fracture of 20MnSi hot rolling ribbed steel bar was researched. The results show that the key reason for cold bending fracture is due to C, Si, Mn elements of excessive levels of steel, existing non-metallic inclusions, granular bainite and Widmanstatten structure. Combining with production process,the influence mechanism of non-metallic inclusion, chemical composition, granular bainite and Widmanstatten structure on the cold bending fracture of steels was discussed.

关 键 词：热轧带肋钢筋 冷弯断裂 粒状贝氏体 魏氏组织 非金属夹杂物 

分 类 号：TG335.11[金属学及工艺—金属压力加工]