改善GCr15轴承钢小型棒材低倍质量的连轧工艺实践

Practice of Continuous Rolling Process to Improve Macrostructure of Small Size Bar Products of Bearing Steel GCr15

通过降低轧制速度,增加粗轧道次压下量特别是后几道次的压下量,使GCr15轴承钢150 mm×150mm铸坯连轧成Φ30～45 mm材的低倍质量明显提高,缩孔出现率由改善轧制工艺前的26%～46%降至0,超声波探伤合格率100%,一般疏松级别0～1,中心疏松级别1～1.5。

With decreasing rolling speed, increasing reduction in rough rolling passes especially in last passes, the quality of macrostructure of continuous roiling Ф30 -45 mm round products of bearing steel GCr15 roiled from 150 mm × 150 mm casting billet increases obviously i.e. occurred ratio of residual shrinkage hole decreases to 0 from 26% - 46% before improvement of rolling process, qualified ratio of ultrasonic detection is 100% , rating of general porosity is 0 - 1 and rating of center porosity is 1 - 1.5.