Through utilizing controlled cooling technique on large section bearing steel bar after rolling ,an ideal initiation structure sorbide can be attained.

利用快速冷却技术，可以得到球化退火的理想预组织──索氏体。

What is obtained with the forging waste heat normalizing and controlled cooling technique is the coarse stable structure in a 20CrMnTi gear, but its cutability is good.

余热正火和常规的正火处理后，再经同样的工艺进行渗碳、淬火和回火处理，试验证明：其渗层和心部的组织、晶粒度及机械性能均相同。