热处理工艺: 退火，去应力退火，球化退火
Heat Treatments: Annealing, Stress-Relief Annealing, Spheroidizing Annealing. 

特性:
调整硬度以便进行切削加工或冲压加工。
消除残余应力，以防变形，开裂。
细化晶粒，改善组织以提高力学性能。

Properties:
Adjust the hardness level for cutting or stamping process.
Remove residual stress to prevent the deformations and cracks. 
Refine the grains to improve the structures and increase the mechanical properties.