大规格轴承钢盘条控冷工艺对球化退火的影响  

Effect of Controlled Cooling Process on Spheroidizing Annealing of Large Size Bearing Steel Wire Rod

作　　者：张磊[1,2] 孙建林 王伟[2] 宋振平 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]邢台钢铁有限责任公司,河北邢台054027

出　　处：《热加工工艺》2017年第19期129-131,135,共4页Hot Working Technology

摘　　要：实验采用同一炉轴承钢钢坯和同样的加热、轧制及退火工艺,排除其余因素的影响,仅对吐丝温度、冷却方式和风机数量进行调整。结果表明:斯太尔摩冷却强度大于集卷冷却,但部分盘条出现脆断的现象,冷却速度需要根据冷却线情况及盘条组织进行调整;在较低的吐丝温度下,轴承钢形成了大量的颗粒状渗碳体,细密、破碎的碳化物在退火温度下未完全溶解,导致冷却过程中形核位置增加,有利于球化退火。Using the bearing steel billet fi＇om same furnace and the same heating, rolling and annealing process, eliminating the influence of other factors, the spinning temperature, cooling-down method and fan number were only adjusted in experiment. The results show that Stelmor cooling strength is greater than that of the coil cooling, but brittle fracture phenomenon appears in some rods. The cooling rate should be adjusted according to the cooling line and wire rod mierostructure. Under the low spinning temperature, a large number of granular cementites are formed in the bearing steel. The free, broken carbides are not completely dissolved at the annealing temperature, resulting in the increase of nucleation positions during the cooling process, which is beneficial for spheroidizing annealing.

关 键 词：控冷 球化退火 风冷线 

分 类 号：TG335.6[金属学及工艺—金属压力加工]