The Effect of Microstructure of Hot Rolled Alloy Steel Wire Rods on Cold Heading Annealing Process
Cold heading carbon steels for 8.8 grade fasteners are mostly produced by pouring reel or spooler plant. Currently, with improvement of cold heading equipment, the 10.9 grade fasteners produced by cold heading have replaced most of hot forged fasteners gradually. As well known, wire rod coil has been used to produce alloy steels.The properties and microstructures of medium carbon alloy steels, such as B7, ML40Cr and SCM435, produced by wire rod coils under hot rolled condition and after spheroidization, have been investigated. In this paper, the effect of microstructure of hot rolled steel wire rods on cold heading annealing process was studied. The results show that the hardness of wire rod coil products is generally lower than that of bar products by 5 ～ 10 HRB and the ferrite fraction in wire rod coil products is higher. After spheroidization treatment, the hardness value and spheroidization grade of wire rod coil products are relatively low. alloy steels of wire rod coils can be directly drawn slightly and the annealing time can be reduced at the same time. This practice is much helpful for energy conservation.
wire rod coil alloy steel cold heading annealing
DENG Suhuai WANG Liping LI Sujia XIAO Shuyong
ShouGang Research Institute of Technology, China; Shougang High Speed Wire Mill, China
国际会议
The 6th International Conference on High Strength Low Alloy Steels(第六届高强度低合金钢国际会议HSLA Steels2011)
北京
英文
559-563
2011-05-31（万方平台首次上网日期，不代表论文的发表时间）