Abstract: There were obvious mixed grain structure in X60 pipeline steel(0.04～0.06C,1.24～1.30Mn,0.04~0.05Nb,0.006～0.008Ti,0.015～0.030V)produced by 6 pass CSP(compact strip production)rolling. The mixed grain structure was climinated and the grain sizes in steel were 5.6~8.0 pm by no V added,modifed the composition-0.06~0.08C,1.24～1.30Mn,0.02～0.04Nb,0.007～0.010Ti,and the reduction ratio at first and second pass increased respectively to ≥42% and ≥40% from normal ≥39% and ≥36% to provide temperature and energy conditions for austenite complete recrystallization.

Key words: CSP Process, Mixed Grain Structure, V, Reduction Ratio

摘要： 包钢X60管线钢(%:0.04~0.06C,1.24~1.30Mn,0.04~0.05Nb,0.006~0.008Ti,0.015~0.030V)经6道次CSP(紧凑式带材生产技术)轧制后存在严重的混晶。通过不加V,成分改为(%):0.06~0.08C,1.24~1.30Mn,0.02~0.04Nb,0.007~0.010Ti,并第1、2道的压下量分别由≥39%和≥36%提高到≥42%和≥40%,为奥氏体再结晶的充分进行提供了温度和能量条件,消除混晶组织,钢的晶粒尺寸为5.6~8.0μm

关键词: CSP工艺, 混晶组织, V, 压下量