我们的法兰叉头、焊接叉采用ZG35CrMo，为消除铸造应力、提高材料机械性能，我们对所有法兰叉头、焊接叉进行调质处理，硬度达到238-268之间。

　　ZG35CrMo is used for our flange forks and welding forks. In order to eliminate the casting stress and improve the mechanical properties of the materials, we have tempered all flange heads and welding forks with a hardness of 238-268.

　　调质可以提高材料的强度、塑性和韧性从而减少万向轴在使用中损坏的机率，延长万向轴使用寿命。

　　Quenching and tempering can improve the strength, ductility and toughness of the material, thereby reducing the chance of damage to the cardan shaft during use and extending the service life of the cardan shaft.