Analysis and Countermeasures on Influence Factors of Internal Quality of Hot Rolled GCr15 Bearing Steel Bar
SHI Qiuying
LU Dengyao
Abstract：The shrinking hole, carbide fluid precipitation and micro cavity defects in continuous casting bearing steel process mainly decided the continuous casting process, high temperature diffusion at heating and initial deformation quantity at rolling. Through controlling continuous casting superheat temperature within 20-30 ℃, using electromagnetic stirring and ensuring their end in the ideal position, keeping heating temperature in 1 180-1 220 ℃, controlling rolling rhythm in 1.0 piece/min for 150 × 150 mm continuous casting billet and rolling rhythm in 2.0 piece/min for 180×220 mm continuous casting billet, controlling compression ratio big than 12 and controlling rolling compression ratio in 5.0 above at 7 initial rolling passes, the shrinking hole, carbide fluid precipitation and micro cavity can be relieved or even eliminated.
Keywords：bearing steel GCr15shrinking holecarbide fluid precipitationmicro cavity
Publication Date：2014-07-02
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：4( 29-31,34 )