82B盘条控冷工艺优化研究  

Optimization of Control Cooling Process of 82B Steel Wire

作　　者：赵紫锋 宋介中 Zhao Zifeng;Song Jiezhong(Baise University,Baise Guangxi 533000;Shanxi Zhongyang Iron and Steel Co.,Ltd.,Zhongyang Shanxi 033400)

机构地区：[1]百色学院,广西百色533000 [2]山西中阳钢铁有限责任公司,山西中阳033400

出　　处：《山西冶金》2020年第4期33-36,共4页Shanxi Metallurgy

摘　　要：通过热膨胀试验测定了82B试验钢的临界转变温度并绘制静态CCT曲线;研究了冷却制度对82B盘条金相组织的影响。结果表明:冷却相变时大的过冷度,可以减小片层间距,提高索氏体化率,得到强度和伸长率更好的盘条。因此须增加相变前的冷速(不低于8℃/s),控制相变过程中温度的稳定(560~640℃),控制相变后冷速不进入马氏体转变区间。经过工艺调整,盘条的索氏体化率从88%提高到90%以上,珠光体片间距控制在150 nm以下。Through the thermal expansion test, the critical transition temperature of the 82 B test steel was measured and a static CCT curve was drawn. The effect of the cooling system on the sorbitization rate and the pearlite lamellar spacing was analyzed. The results show that a large degree of supercooling during the cooling phase transition can reduce the interlamellar spacing, increase the soxitization rate, and obtain wire rods with better strength and elongation. Therefore, it is necessary to increase the cooling rate before the phase change(not less than 8 ℃/s),control the temperature stability during the phase change(560~640 ℃) and the cooling rate not to enter the martensite transformation interval after the phase change. After the process adjustment, the sootization rate of the wire rod is increased from 88% to more than 90%, and the pearlite plate spacing is controlled below 150 nm.

关 键 词：82B盘条 连续冷却 索氏体化率 珠光体片层间距 

分 类 号：TG335.16[金属学及工艺—金属压力加工]