Base Material : Screws & Barrel’s are made from nitroalloy steel
34CrAINi7, 38CrMoAIA , 41CrAIMo7 , Stainless Steel (304, 316 , 416 ,17-
4ph) , Tool Steel & CPM Tool Steel.
Hardening & Heat Treatment : Toughening , Tempering , Gas/Ion
Nitriding & Additional Bimetallic Coatings can be incorporated. We also
do special surface treatment like hard nickel plating, chrome plating &
PVD Coatings , HVOF Thermal Spray & PTA weld overlay , vaccum
through hardened screws.
Mixing Sections : the more common of which , include Maddock ( Spiral
or Straight ) , Hoechst, dulmage , pinned , pineapple or combinations of
these designs are available. Our Capacity ranges from 25mm up to
200mm depending on L/D ratio.
Technical Specification :
- Hardness After Hardening & Tempering : HB280-320.
- Nitrided Hardness : HV850-1000.
- Nitrided Case Depth : 0.45-0.7mm.
- 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 : HRC56-65 / Alloy Depth : 0.8 – 2.0mm.
| Heat Treatment |
Wear Resistance Bimetallic Screw |
Spin Cast Inlay layer Bimetallic Barrel |
| Gas/Plasma Nitrided |
PTA Boron (Full Length) Colomony 63 Ni/Cr 1.5mm layer. |
Boron Inlay layer 1.5 To 2mm. |
| PM Tool steel vaccum Hardened |
PTA Tungsten 20 To 50% ( Last zone/Entire) |
Tungsten (10-35%) Inlay layer 1.5 To 2mm |
| Hard Chrome Plating |
HVOF Thermal Spray Coating ( 88% Wc ) Flight od & core |
PM Tool Steel Vaccum hardened throughout hrdn. |
