Bimetallic Screw, Bimetallic Barrel

We are offering bimetallic screw, bimetallic barrel.
specification:
screw diameter: ø 15mm- ø 300mm
maximal length:8000mm
barrel inner diameter:15-300mm
maximal length:4000mm
different bimetallic alloys are available for different raw materials.
base materials：
(1)38crmoala(jis sacm645)
(2)42crmo(aisi 4140)
(3)4cr5mosi v1 (jis skd-61)
(4)9cr18mov
(5)hpt
bimetallic alloy materials：
(1)fe-based alloy
(2)ni-based alloy/deloro alloy
(3)co-based alloy
(4)nico-based alloy
(5)tungsten carbide/wolfram carbide
technics:
heat treatment
high-frequency quenching
nitriding treatment
hard-chrome electroplating
bimetallic alloy welding
bimetallic alloy centrifugal casting
technical parameter:
nitrided layer depth:0.5-0.8mm
nitrided hardness:900-1000hv
nitrided brittleness: less than grade 1
surface roughness: ra0.4
linearity of screw: 0.015mm
hard-chrome plating hardness after nitriding: ≥950hv
chrome-plating layer depth:0.025-0.085mm
bimetallic layer depth:3mm