终轧温度和冷却工艺对Φ36mm GCr15轴承钢网状碳化物的影响
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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661~707℃时,网状碳化物为1.5~2.5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。
The effect of end-rolling at 905~930℃,air cooling,end-rolling at 905~930℃,cooling to 675~707℃ by crossing water,and end-rolling at 845~870℃,cooling to 661~698℃ by crossing water on carbide network inΦ36 mm hot-rolled bar of bearing steel GCr15 has been tested and studied.Results show that the rating of carbide network in bearing steel GCr15 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.
The effect of end-rolling at 905~930℃,air cooling,end-rolling at 905~930℃,cooling to 675~707℃ by crossing water,and end-rolling at 845~870℃,cooling to 661~698℃ by crossing water on carbide network inΦ36 mm hot-rolled bar of bearing steel GCr15 has been tested and studied.Results show that the rating of carbide network in bearing steel GCr15 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.
引文
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[4]戴起勋.金属材料学[M].北京:化学工业出版社,2005:75.
[5]王东兴,肖攸毅.连轧GCr15轴承钢的控轧控冷工艺[J].特殊钢,2004,25(3):48-49.