Abstract: 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.

摘要： 试验研究了终轧905~930℃,空冷,终轧905~930℃,穿水返红至675~707℃,终轧845~870℃,穿水返红至661~698℃对Φ36 mm GCr15轴承钢棒材网状碳化物的影响。结果表明,轧后空冷的GCr15轴承钢棒材的网状碳化物级别较高为3级;轧后棒材经穿水后返红温度为661707℃时,网状碳化物为1.52.5级,能满足冷加工用途GCr15轴承钢的要求（网状碳化物≤2.5级）;低温精轧和降低终轧温度能明显改善GCr15轴承钢热轧材的网状碳化物。