Screw elements of twin screw extruder
1. Material is 3Cr2W8V, H13(injection chamber), the whole body quenching hardness: HRC60± 2, nitridation hardness: 1050HV, inner hold for fine grinding Ra value 0.4
2. Material: Cr12molvl, the whole body quenching hardness: HRC60± 2, inner hole for fine grinding Ra value 0.4;
3. Diffluencece combing, backflow parts material: Imported SKD61 quenching hardness: Above HRC55 or double alloy structure;
4. Can proceed to plate hard chrome after nitriding screw surface; The thickness for chromeplate is 0.03-0.04mm;
5. The passagewaypart for all kinds of mould, the thickness for plating hard chrome is 0.05-0.08, Polishing fine-coarse degree reach Ra value 0.4-0.2;
We also have another material for optional. That is W6Mo5Cr4V2. More high hardness. HRC61.
Material |
38CrMoAiA |
tempering hardness: |
260-290HBS |
Metallurgical structure: |
More than 95% sorbite |
crystal particle degree |
6-8 grade |
Nitridation layer depth |
0.4-0.7 |
Nitridation rigidity on surface: |
940-1050HV |
brittleness |
less than 2 grade |
thickness: |
2.6-3mm |