... , 2205,1Cr18Ni9Ti, 420ss,4140,1045, Nickel-phosphorus alloy galvanized carbon steel layer)Heat treatment is applied to prevent fatigue crack.Crank shaft ... , Colmonoy coated,Tungsten carbide coated wear resistant and anti-corrosive layer).Packing seal: Aramid fiber ,Kevlar or carbon constructional fiber are ...