Analysis of 60Si2Mn spring flat steel shear crumbling
60Si2Mn spring flat steel corner crumbled during shear process.Flat steel with corner crumble in A steel plant and flat steel without corner crumble in B steel plant were tested and analyzed.The results of chemical composition,decar-burization layer,microstructure,inclusion and macroscopic test of samples of A steel plant are better than that of B steel plant,There is little difference in mechanical properties,hardness of sample from steel plant A is higher than that from steel plant B.Fracture surface observed by SEM showed that there was no obvious cracking in sample of B steel plant,but there were tear marks at corner of the sample,and tendency of cracking appeared.Results show that shearing force of large size flat steel used by users has reached limit of cold shear machine,which leads to phenomenon of shear-breaking.It is suggested that cutting mode should be changed and sawed to ensure cutting quality.
万方数据
维普
