刘立, 赵俊学, 崔雅茹, et al. Practice of Process for Bearing Steel GCr15 Produced by 100 t UHP EAF-LF(VD)-CC Flow Sheet at Nanjing Steel[J]. Special Steel, 2008, 29(6): 39-40.
刘立, 赵俊学, 崔雅茹, et al. Practice of Process for Bearing Steel GCr15 Produced by 100 t UHP EAF-LF(VD)-CC Flow Sheet at Nanjing Steel[J]. Special Steel, 2008, 29(6): 39-40.DOI:
Bearing steel GCr15 is produced by 100 t high impedance UHP EAF steelmaking - 100 t ladle furnace refining - 5 strand 150 mm×150 mm billet concasting - continuous rolling process at Nanjing lron and Steel Co Ltd. The statistic results of bearing steel CCr15 production data showed that with charging 55%~70% hot metal
controlling end point carbon 0.22%~0.24%
phosphorus 0.004%~0.006% and sulphur 0.040%~0.043% in liquid steel at EAF tapping
ladle refining by slag(%:53~58CaO
13~16SiO
2
15~20Al
2
O
3
3~5MgO)with basicity2.3~3.3 and whole period Ar stiring
67 Pa VD treating≥20 min
concasting with shiclding practice in whole period
the average oxygen con- tent in bearing steel CCr15 after VD treatment was 10×10