20MnSi螺纹钢表面开裂原因分析  

Analysis on Causes of Surface Cracking of 20MnSi Steel Reinforced Bar

作　　者：李雪峰[1,2] 袁晓冬 张先锋 夏申琳 LI Xuefeng;YUAN Xiaodong;ZHANG Xianfeng;XIA Shenlin(Luoyang Ship Material Research Institute,Luoyang 471023,Henan China;Henan Key Laboratory of Technology and Application of Structural Materials for Ships and Marine Equipments,Luoyang 471023,Henan China)

机构地区：[1]洛阳船舶材料研究所,河南洛阳471023 [2]河南省船舶及海工装备结构材料技术与应用重点实验室,河南洛阳471023

出　　处：《热处理》2020年第3期52-55,共4页Heat Treatment

摘　　要：20MnSi钢制直径12 mm的螺纹钢表面出现大量裂纹。对开裂的螺纹钢进行金相检验、化学成分分析和能谱分析,以揭示其开裂的原因。结果表明:螺纹钢的化学成分和显微组织均符合要求,但表面裂纹中有密集的夹渣,是没有清除干净残留在坯料中的保护渣。螺纹钢开裂是夹渣在轧制过程中暴露到表面所致。A large number of cracks appeared at surface of 12-mm-diam reinforced bar made from 20 MnSi steel.The cracked reinforced bar was subjected to metallographic test,chemical composition analysis and EDS analysis to discover the reason why the reinforced bar cracked.The results showed,chemical composition and microstructure all conformed with the requirements,however,dense slag inclusion which was a protecting slag not being thoroughly removed thus remaining in the billet were found to appear in the crack.The reinforced bar cracking stemmed from exposure of the slag inclusion to its surface during rolling.

关 键 词：螺纹钢 裂纹 非金属夹杂物 夹渣 

分 类 号：TG115[金属学及工艺—物理冶金]