标准件简介Cold forming 冷打Hot forging 红镦P C 8 = property class 8 机械性能8级原材料:Raw material球化退火:Annealing冷拔:Drawing冷镦:Forming机加工:Machining螺纹成型:Roll Threading热处理:heat-treatment表面处理:finish去氢:Lustrating hydrogen检验