热轧工艺参数对GCr15轴承钢晶粒度的影响

为实现奥氏体再结晶控制轧制,根据石钢30 t转炉生产的GCr15轴承钢再结晶图,结合现场1 150～910℃14道次轧制Φ35 mm圆钢的工艺制度,通过Gleeble 1500热模拟试验机对GCr15连铸坯切取的试样进行1 150～910℃6道次的模拟试验。模拟试验结果表明,通过累计变形量82%,试样的再结晶率达91%,晶粒度为6级。若提高Φ530 mm轧机的实际轧制的压下量,使累计变形量由52%提高至60%,可使Φ35 mm GCr15轴承钢的晶粒进一步细化。

Influence of Hot Rolling Parameters on Grain Size of GCr15 Bearing Steel

In order to be carried out austenite recrystallization control rolling, based on recrystallization diagram of GCr15 bearing steel produced by a 30 t converter at Shijiazhuang Steel and combined actual technology of Φ35 mm round bar rolled by 14 pass at 1 150 ~ 910 ℃ at situ, the simulation test to samples cut from concasting billet of GCr15 bearing steel has been carried out by using Gleeble 1500 thermal simulation machine with 6 pass at 1 150 ~910 ℃. Simulation test results showed that with accumulated deformation 82% , the grain size rating of samples was 6 with recrystallization ratio 91%. As increasing the percent reduction of Φ530 mm rolling mill to increase the accumulated deformation from 52% to 60% , the grain of Φ35 mm GCr15 bearing steel shall fine further.