Abstract: With decreasing rolling speed, increasing reduction in rough rolling passes especially in last passes, the quality of macrostructure of continuous rolling Φ30 ~45 mm round products of bearing steel GCr15 rolled from 150 mm x 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.

Key words: Bearing Steel GCr15, Continuous Rolling for Bar Products, Residual Shrinkage Hole, Reduction in Pass, Process Improvement

摘要： 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。

关键词: GCr15轴承钢, 棒材连轧, 缩孔残余, 道次压下量, 工艺改善