... 68/143, 70/135,70/140, 75/150, 80/143, 80/156, 92/188, 95/191, 105/191, ... casting GHII3 nature hard after high temperatureMaterial of screw raw material The finished product processing requirements38CrMoAlA, ... type:Gradual type, mutant type, wave type, barrier type, double screen type, shunt type, separation type, exhaust type, pin type, mixed type, double- head type, three-head type, multi head type ...