... 3.high speed steel W6Mo5Cr4V2 4. quenching treatment screw element for co-rotating twin screw extruder machineMaterial: W6Mo5Cr4V2 high ... ,ect+Calcium carbonate,talcum power,titanic powder,ABS,PC,PS,ect+aluminum hydroxide,magnesium hydroxide,antimony oxide.PP,PA ... and other auxiliary agents:combustion-supporting machine pelletsPP,PE,PS ect +starch:de-composing machine pelletsPE+fog-preventing dipper ...