钒氮微合金化控冷工艺开发HRB500E抗震钢筋  

Development of HRB500E seismic grade rebars by using VN microalloyed and controlled cooling process

作　　者：陈伟[1,2] 施哲[1] 赵宇[2] 

机构地区：[1]昆明理工大学冶金与能源工程学院,云南昆明650093 [2]武钢集团昆明钢铁股份有限公司技术中心,云南昆明650302

出　　处：《重庆大学学报（自然科学版）》2011年第11期56-64,共9页Journal of Chongqing University

基　　金：云南省科技计划资助项目(2009BA008)

摘　　要：为降低HRB500E抗震钢筋生产成本,更好地促进其生产及推广应用,国内某钢厂采用钒氮微合金化控冷工艺试制HRB500E抗震钢筋。采用金相显微镜、扫描电镜、透射电镜、X射线衍射仪、闪光焊接、材料试验机及力学性能测试,对该工艺析出强化和晶粒细化强化机理及效果,控冷终止温度和钢筋力学性能匹配关系,钢筋金相组织、焊接、时效及高应变低周疲劳性能进行了研究分析。结果表明:钢中加入适量钒氮合金,V(CN)析出量占总钒量的66.67%,微合金析出强化效果明显;控冷后终止温度控制在680～710℃,钢筋强度具有25MPa以上富余量,强屈比(Rm实/ReL实)>1.26,均匀伸长率(Agt)≥11.5%,细晶强化和抗震性能较好;钢筋具有低应变时效性、良好的焊接及高应变低周疲劳性能;生产成本与钒氮微合金化热轧工艺相比降低82元/t,经济效益显著。In order to reduce the production cost of HRB500E seismic grade rebars,promote its production and application,HRB500E seismic grade rebars are developed by using VN microalloyed and controlled cooling process in domestic steel plant.The mechanism and effect of precipitation strengthening and fine-grain strengthening,the relationship between termination temperature after controlled cooling and mechanical properties of rebars,microstructure,welding and aging properties,high-strain and low-cycle fatigue properties for rebars are researched by using metallographic microscopy,scaning electron microcopy,transmission electron microscopy,X-ray diffraction apparatus,flash-butt welding,materials testing machine and mechanical properties testing.The results show that V（C,N） precipitation amount accounts for 66.67% of the total amount of vanadium by adding VN alloy in liquid steel,effect of microalloy precipitation strengthening is remarkable;when termination temperature after controlled cooling is controlled at 680~710 ℃,the amount of strength surplus for rebars is more than 25 MPa,Rm/ReL ratio is greater than 1.26,uniform elongation（Agt） is more than or equal to 11.5%,good effect of fine grain strengthening and seismic performance are obtained;rebars have some good features such as low strain aging,good welding performance,high-strain and low-cycle fatigue properties;compared with VN microalloyed and hot-rolled process,the production cost is reduced by RMB 82 Yuan/t,and economic benefit is obvious.

关 键 词：钒氮微合金化 控冷 HRR500E V(CN) 控冷终止温度 

分 类 号：TG306[金属学及工艺—金属压力加工]