1. Material is 38CrMOALA, tempering hardness: 260-290HBS, Nitridation layer depth: 0.4-0.7,
Nitridation rigidity on surface: 940-1050HV,
Thickness: 2.6-3mm; Hardness: HRC62± 2, without crack and flaw; Make bottom part nitridation treatment;

2. 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

3. Material: Cr12molvl, the whole body quenching hardness: HRC60± 2, inner hole for fine grinding Ra value 0.4;

4. Diffluencece combing, backflow parts material: Imported SKD61 quenching hardness: Above HRC55 or double alloy structure;

5. Can proceed to plate hard chrome after nitriding screw surface; The thickness for chromeplate is 0.03-0.04mm;

6. 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;