Abstract: Effect of finishing temperature (750 ~900 °C ) and product size (Φ12 mm and Φ5. 5 mm) of rod on precipitation of carbide network in bearing steel GCrl5 has been studied. Results show that as railing ① 12 mm rod, with finishing temperature 800 °C , the rating of carbide network is minimum i. e. 1. 5, with decreasing finishing temperature to 750 °C , the rating of carbide network increases to 2. 0 ； as rolling Φ5. 5 mm rod, with finishing temperature 850 °C , the rating of carbide network in minimum i. e. 1. 5, with decreasing finishing temperature to 800°C the rating of carbide network increases again to 2. 5. For the light rod, the too low finishing temperature is not available to inhibit the precipitation of carbide network in steel. Therefore the optimum finishing temperature is related to specification of rolled products.

Key words: Steel GCrl5, Carbide Network, Finishing Temperature, Specification of Rolled Product

摘要： 研究了终轧温度(750～900℃)和成品规格(Φ12 mm和Φ5.5 mm)对GCr15轴承钢网状碳化物析出的影响。结果表明,当轧制规格为Φ12 mm、终轧温度为800℃时,碳化物网状级别最低,为1.5,终轧温度降至750℃时,碳化物网状级别增加至2.0;当轧制规格为Φ5.5 mm、终轧温度为850℃时,碳化物网状级别最低,为1.5,终轧温度在800℃时碳化物网状级别又升高至2.5。小规格轧材终轧温度过低,不利于网状碳化物析出的抑制,最佳终轧温度与轧制规格有关。

关键词: GCr15钢, 网状碳化物, 终轧温度, 轧制规格