采用富氮钒微合金化生产大规格HRB500钢筋  

Production of large size HRB500 rebars by using nitrogen-rich and vanadium microalloyed process

作　　者：陈伟[1,2] 赵宇[2] 张卫强[2] 庾郁梅[2] 李金柱[2] 施哲[1] 

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)昆明钢铁股份公司技术中心,云南昆明650302

出　　处：《钢铁研究》2011年第1期23-27,45,共6页Research on Iron and Steel

基　　金：云南省科技计划项目(2009BA008)

摘　　要：采用扫描电镜、透射电镜、金相显微镜、闪光焊接及力学性能测试,对国内某厂采用富氮钒微合金化生产的Φ40 mm HRB500抗震钢筋微合金析出强化效果、力学性能、金相显微组织、夹杂物、焊接及时效性进行了试验研究。结果表明：采用增氮降钒工艺增加了细小弥散的钒析出相数量,析出相尺寸为10~30 nm,其中V（CN）析出物占总w（V）的79.35%,析出强化效果显著;钢中夹杂物尺寸小且数量少,A、B、D类夹杂小于1.0级,C类夹杂小于1.5级,有利于控制钢中微裂纹的萌生与扩展,改善钢筋塑韧性;钢筋强屈比（Rm实/ReL实）不小于1.27,均匀伸长率（Agt）不小于12%,抗震性能好;自然时效1个月后强度变化平缓,具有低应变时效性;焊接试样断口远离焊接接头、焊接性能良好;生产成本和钒氮微合金化工艺相比吨钢降低20元。The precipitation strengthening effect of microalloying,mechanical properties,microstructure,inclusions,welding performance and aging properties for HRB500 （Φ40 mm） seismic rebars produced by nitrogen-rich and V microalloyed process were researched by using scanning electron microcopy,transmission electron microscopy,metallographic microscopy,flash-butt welding and mechanical property testing.The results showed that the amount of dispersed vanadium precipitates was increased by using the process of increasing nitrogen and decreasing vanadium process,precipitate size of 10 ~ 30 nm,V（C,N） precipitation amount accounted for 79.35 % of the total amount of vanadium in steel,precipitation strengthening was remarkable;the size and number of inclusions in steel were small by using slag washing and casting with shielding practice in whole period,A,B,D type inclusions less than 1.0,C type inclusions less than 1.5.It is helpful to control micro-crack initiation and propagation and improve plasticity and toughness of rebars.Rm/ReL ratio was greater than 1.27,uniform elongation（Agt） was greater than 12 %,good effects on seismic performance were obtained.No obvious change of strength was found after a month of natural aging with low strain aging.Fracture of welded sample was away from welded joints with good performance.Compared with VN microalloyed process,the cost of rebars is reduced by 20 RMB per ton.

关 键 词：富氮钒微合金化 HRB500抗震钢筋 V(CN) 夹杂物 

分 类 号：TF762.3[冶金工程—钢铁冶金]