The effect of end-rolling at 905 ~ 930 °C

air cooling

end-rolling at 905 ~ 930 ℃，cooling to 675 ~ 707 ℃ by crossing water

and end-rolling at 845 ~ 870 ℃

cooling to 661 ~698 °C by crossing water on carbide network in Φ36 mm hot-rolled bar of bearing steel GCr15 has been tested and studied. Results show that the rating of carbide network in bearing steel GCrl5 bar air-cooling after rolling is 3

higher than requirement

the rating of carbide network in bar cooling to 661 ~707 ℃ by crossing water after rolling is 1. 5 ~ 2. 5 to meet the requirement for bearing steel GCr15 for cold working service ( rating of carbide network 2. 5) ； and the carbide network in hot-rolled products of bearing steel GCr15 may be obviously improved by finishing rolling at lower temperature and decreasing end rolling temperature.