金相组织和夹杂物对40Cr边部裂纹形成的影响  

Effect of microstructure and inclusions on the formation of edge crack in 40Cr

作　　者：赵烁[1,2] 马良[1,2] 闫涛[1,2] 马光民 

机构地区：[1]河北工程大学冶金工程系,河北邯郸056038 [2]河北省紧固件产业技术研究院,河北邯郸056000 [3]河北永洋特钢集团有限公司,河北邯郸056000

出　　处：《连铸》2017年第2期43-47,共5页Continuous Casting

基　　金：河北省钢铁联合基金项目(E2016402096;E2016402111);河北省紧固件产业技术研究院项目;河北工程大学青年学术骨干基金项目

摘　　要：针对永洋特钢集团公司40Cr轧材边部裂纹的成因和影响因素进行系统调查研究,通过一系列取样、检验和分析发现,某纵裂纹内含有与钢渣反应产物、结晶器保护渣类似的残存物,结合160 mm×225 mm铸坯热轧工艺过程,最终得出该钢种产生裂纹的主要原因是由于脆性夹杂物较多、铸坯表面粘渣或有细小裂纹,以及加热过程脱碳严重、轧制变形制度不合理。Formation mechanism and influence factors of edge cracks in 40Cr rolled products were investigated system- atically in Yongyang Special Steel Group Co., Ltd. By sampling, examining and analyzing of 40Cr steels, the results show that the inclusions in the longitudinal cracks have the same elements as the steel-slag products and mould flux. Combining with the hot rolling process of 160 mm × 225 mm billet, it can be concluded that the edge surface cracking in 40Cr steel are mainly caused by the more brittle inclusions in steel, viscous slag and fine cracks on billet surface, seri- ous decarburization in the heating process and improper rolling deformation system.

关 键 词：40Cr 边部裂纹 夹杂物 金相组织 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG335[金属学及工艺—金属材料]