摘要
ML20MnTiB冷镦钢在镦制时发生螺帽开裂,本文采用金相、SEM对ML20MnTiB开裂的成因进行分析。结果表明,导致ML20MnTiB盘条镦制螺栓开裂的原因是盘条表面存在热加工缺陷所致。针对开裂原因提出改进措施,改进后工件的合格率达到≥99.3%,满足生产要求。
Cracks are occurred in hexagon socket head bolts of ML20MnTiB coldheading steel wire.The microstructure of ML20MnTiB was analyzed by metallographic microscope and electron microscope.The results show that the reason for the crack of ML20MnTiB cold heading steel is the defect of rod surface.According to the reason of cracking,the improvement measures were put forward,and the qualified rate of the improved workpiece reached more than 99.3%,the production requirements can be met.
作者
韩丽娟
尹衍成
魏鑫燕
HAN Lijuan;YIN Yancheng;WEI Xinyan(Testing Institute of Qingdao Special Steel Co.,Ltd.,Qingdao 266400,China)
出处
《山东冶金》
CAS
2021年第3期30-31,共2页
Shandong Metallurgy
