35CrMoA圆钢热顶锻开裂原因分析  

Cause analysis on upset forging cracking of 35CrMoA round steel

作　　者：李丰德 LI Fengde(Fujian Sangang Group Co.,Ltd.,Sanming 365000,China)

机构地区：[1]福建三钢集团,福建三明365000

出　　处：《物理测试》2023年第3期28-32,共5页Physics Examination and Testing

摘　　要：针对某厂生产的35CrMoA圆钢热顶锻批量开裂情况,借助光学显微镜、扫描电镜和能谱仪等检测方法,对其开裂原因进行了分析。结果表明:热顶锻开裂原因是轧材中存在大颗粒氧化夹杂物,夹杂物来源主要为冶炼及连铸过程的卷渣。通过提高钢水洁净度、优化LF精炼工艺、提高保护渣黏度、优化结晶器流场等措施,有效降低35CrMoA圆钢中的卷渣,提高了该圆钢的热顶锻合格率。Aiming at the unqualified batch cracking of upset of 35CrMoA hot-rolled round steel produced by a factory,some detection methods including optical microscope,scanning electron microscope and energy disperse spectroscopy were employed to analyze the reasons for cracking.The results showed that the main reason for upset cracking was the existence of large inclusions in the base metal,which were mainly from the slag in smelting and continuous casting process.By improving the purity of steel,optimizing the LF refining process,increasing the viscosity of the mold slag,and optimizing the flow field in crystallizer,the inclusion content in 35CrMoA round steel could be effectively reduced.Consequently,the qualification rate of upset forging of the round steel was improved.

关 键 词：35CrMoA圆钢 热顶锻裂纹 夹杂物 工艺控制措施 

分 类 号：TG316[金属学及工艺—金属压力加工]