Description
Specifications and technical indicators:：
Screw processing diameter range：Ø20mm-Ø300mm
Length/diameter ratio：L/D=15～55
Quenching and tempering hardness：HB240°～280°
Nitriding hardness：HV850°～1000°
Nitriding depth：0.45～0.7mm
Nitriding brittleness：≤ Grade 2
Surface roughness：Ra0.4
Screw straightness：0.015mm
Hard chrome plating after nitriding：HV≥900HV
Chrome plating thickness：0.05～0.10mm
Alloy depth：0.8～2.0mm
Double alloy hardness：HRC56°～65°（alloyed nickel-based alloy）
Material：
High quality alloy steel
① 38CrMoALA(JIS SACM645)
③ SKD61
Heat treatment：
Nitriding treatment
Electroplated hard chrome layer
Spray corrosion-resistant, wear-resistant bimetallic layer
Vacuum quenching
Application：
Extruder, injection molding machine
