CSP生产X60管线钢的化学成分和轧制工艺对混晶的影响

Effect of Chemical Composition and Rolling Process on Mixed Grain of CSP Produced X60 Pipeline Steel

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5.6～8.0 μm.

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 produection） rolling. The mixed grain structure was eliminated and the grain sizes in steel were 5.6 ～ 8.0 μm by no V added, modified 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.