... ,pipes,electrical -crusts or humpers etc.Characteristics: 1. Both the screw and cylinder adopt 38CRMOAL alloy steel, processed by nitrogen , the ... , all kinds of plastics can be applicable .1. Both the screw and cylinder adopt 38CRMOAL alloy steel, processed by nitrogen , the ... use and able to bear corrosion .Technical parameters:TypeDiameter of screw(mm)L/D ration of screwProductivity(kg)Main power(kw ...