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Material: High quality 38CrMoAl(JIS SACM645)
Hardness after hardening and tempering: HB280-320
Nitrided Hardness:HV850-1000
Nitrided case depth:0.50-0.80mm
Nitrided brittleness:less than grade 2
Surface roughness:Ra 0.4
Screw straightness:0.015mm
Surface chromium-plating's hardness after nitriding:≥900HV
Chromium-plating depth:0.025~0.10mm
Alloy Hardness:HRC50-65
Alloy depth:0.8~2.0mm
conical twin screw and barrel
