... 316L ss,1Cr18Ni9Ti, 420ss,1045,4140)Heat treatment is applied to prevent fatigue crack.Crank shaft (material used: 35CrMo, ... 4140,1045,QT800)Nitrogen hardening treatment is applied to attain strong strength, high hardness, durable and corrosion resistant ... -made product with special specification can be provided to the users. high pressure steam boiler feed water pump,high pressure boiler ...