李颇, 范宇静, 张程, et al. Effect of Fluctuation of Casting Rate on Internal Quality of 250mm x 280mm Bloom of Bearing Steel GCr15[J]. Special Steel, 2017, 38(5): 22-26.
李颇, 范宇静, 张程, et al. Effect of Fluctuation of Casting Rate on Internal Quality of 250mm x 280mm Bloom of Bearing Steel GCr15[J]. Special Steel, 2017, 38(5): 22-26.DOI:
The production process of tested bearing steel GCrl5 is 100t BOF- LF-RH-250mm x280mm bloom casting-φ70mm bar rolling. The effect of bloom casting rate 0.52〜0.58 m/min of bearing steel GCrl5 with casting parameters of mold cooling water rate 2530 L/min
liquid superheating extent 33~37℃
secondary cooling water ratio 0.12 L/kg
M-EMS 530 A/2.5 Hz and F-EMS 400 A/3.0 Hz on bearing steel carbon segregation
shell thickness and end solidification position
and banded structure of Φ70 mm rolled bar has been studied by using the analysis and test methods including bloom cross section carbon segregation examination
nail shot test and optical microscope test Results show that with increasing casting rate the macro carbon segregation of bloom first decreases then increases
the end solidification position moves forward and the length of liquid core becomes longer
to control casting rate 0.55 m/min is available to decrease the bloom macro carbon segregation and the rating of banded structure of rolled products after spheroidizing annealing.