Technical Parameter:
Diameter of screw: φ15-φ500
L/D ratio: 15-55
Maximal length:10000mm
Hardness after hardening and tempering: HB280-320
Nitriding hardness: 950-1100HV
Nitrided layer depth: 0.5-0.8mm
Nitrided brittleness: Less than grade 2
Surface roughness: Ra0.4
Linearity of screw: 0.015mm/m
Bimetallic layer depth: ≥3mm
Bimetallic hardness: HRC60-72
Hard-chrome plating hardness after nitriding: ≥950HV
Chrome-plating layer depth: 0.025~0.10mm
Product classification:
According to different ingredients and products the screw can be chosen: general type, pin type, barrier type, separation type, and gas-exhausting/vented type, etc.
Material:
High-quality alloy steel
38CrMoAlA (JIS SACM645)
42CrMo (AISI 4140)
Technologies:
Nitriding
Hard chrome plating
High-frequency quenching
Vacuum quenching
Alloy powder spray welding
