Screw and barrel wear is a serious matter for maintenance and engineering departments in plastics processing industries. At GEM Technic, we offer full-service wear solutions to barrels, or cylinders, screws and other plasticizing components in plastics industry, injection molding, blow molding and extrusion. 

Wear resistant screw hardfacing materials
wear-resistant Stellite cobalt-based hardfacing alloy:
Stellite cobalt-based alloys consist of complex carbides in an alloy matrix. They are resistant to wear, galling and corrosion and retain these properties at high temperatures. Their exceptional wear resistance is due mainly to the unique inherent characteristics of the hard carbide phase dispersed in a CoCr alloy matrix. 
Stellite 6 cobalt-based hardfacing alloy
Hardness: 40-45 HRC
Stellite 12 cobalt-based hardfacing alloy
Hardness: 46-51 HRC

wear-resistant Colmonoy nickel-based hardfacing alloy:
Colmonoy 56 nickel-based hard facing alloy with chromium
Hardness: 53-58 HRC
Specifically designed for protecting and restoring plastics extrusion and injection screws using plasma transferred arc (PTA) application. High levels of chromium and carbon produce large populations of chromium carbides for superior abrasion and corrosion resistance. The optimized PTA formulation also has reduced boron and increased silicon for better weldability and puddle control.
Colmonoy 57 nickel-based hard facing alloy with chromium and tungsten
Hardness: 52-57 HRC
Specifically formulated for overlaying the flights of new and rebuilt extrusion or injection molding screws, food processing industry feed screws.
Colmonoy 83 nickel-based hard facing alloy with tungsten carbide
Hardness: 45-55 HRC
A tough nickel-chromium-tungsten-boron matrix alloy containing chromium carbides with the addition of extremely hard tungsten-carbide particles for excellent abrasive wear protection. Excellent edge retention. Specifically for plasma transferred arc (PTA) application.
Colmonoy 88 nickel-based hard facing alloy with chromium and tungsten
Hardness: 59-64 HRC
Unique alloy containing chromium and tungsten borides and carbides for maximum abrasion and corrosion resistance for high-temperature, highly abrasive applications.

GEM Technic bore-lining alloys for spun cast high performance bimetallic barrels or bimetallic cylinders
G106 Fe-Ni-boron base alloy: iron-boron alloys or fe-base alloys with rich nickel and boron
with high abrasive wear resistance and thermal or heat stability
for general purpose applications utilizing unfilled or lightly mineral filled plastics up to 30% glass fiber
G106 performs well in medium abrasive and corrosive process environments.
Close to or equivalent to iron boron genera purpose: Bernex A110, Reiloy R121, Wexco 666™, Xaloy X-102

G116 heavy duty nickel-chromium Fe-boron base alloy: iron-boron alloys with increased amount of chromium and nickel for corrosion resistance
to achieve improved resistance to corrosive and abrasive wear
for processing plastics containing up to 40% glass fiber
Close to or equivalent to: Bernex AC333, Reiloy R131, Wexco 686XL, Xaloy X-220

G286 nickel-boron base alloy : nickel base alloy with high chromium and boron content
nickel-boron base alloy delivers excellent abrasion resistance, very high hardness and a very low friction coefficient that helps prevent screw and check ring galling.

G336: nickel-cobalt base alloy: highly corrosion resistant Ni-Co matrix alloy with thermally stable tungsten carbides
outstanding resistance to both abrasive and corrosive wear
Ideal for processing polyvinyl chloride resins, and other resins containing corrosive flame retardants, volatile additives, etc.
Close to or equivalent to: Bernex C242, Reiloy R215, Wexco 555, Xaloy X-306

G556 tungsten carbide alloy: nickel matrix alloys with uniformly dispersed thermally stable micro tungsten carbide particles at a high percentage level
maximum resistance to extreme abrasive and corrosive wear
widely used in highly corrosive environments, such as acidic salts, materials with flame retardants, blowing agents, highly corrosive resins containing halogens and fluoropolymers (FEP, PFA and PVDF, etc.)
Close to or equivalent to: Bernex ACW800, Reiloy R216, Wexco 777-Durocast, Durocast Premium, Xaloy X-800

wear resistant base materials for screws and barrels:
Nitriding Steel and Alloy Steel
Mat.No. 1.8509  DIN 41CrAlNi7   GB 38CrMoAlA  JIS SCM645  Nitralloy 135M
Mat.No. 1.7225  DIN 42CrMo4    GB 42CrMo    JIS SCM440   AISI 4140
Mat.No. 1.8550  DIN 34CrAlNi7   Böhler V820
Mat.No. 1.8519  DIN 31CrMoV9
Tool Steel:
Mat.No. 1.2344  DIN X40CrMoV5-1   JIS SKD61  AISI H13  Böhler W302 ISOBLOC
Mat.No. 1.2379  DIN X155CrVMo121    JIS SKD11   AISI D2  Böhler K110
Powder metallurgy-HIP methods (hot isostatic pressing)
CMP 9V, CMP 10V, Böhler M390, Vanadis 8, Vanadis 10, Vanadis 23
Stainless Steel:
Mat.No. 1.4301  DIN X5CrNi18-10  Stainless Steel 304
Mat.No. 1.4401  DIN X5CrNiMo17-12-2  Stainless Steel 316
17-4PH
Nickel Alloys: 
Hastelloy C-276
Inconel 625
Inconel 718
Heat treatments:
Gas Nitriding   Plasma Nitriding(Ion Nitriding)   Through-Hardening
Coatings:
Hard Chrome Plating
PVD Coatings:
Chromium Nitride (CrN) PVD Coating
Titanium Nitride (TiN) PVD Coating
Titanium Aluminum Nitride (TiAlN) PVD Coating
Flight OD Carbide Encapsulation
Tungsten Carbide Full Encapsulation

Keywords: Mantenimiento de la unidad de plastificación de extrusoras e inyectoras, camisas y tornillos bimetálicos, 
cilindro bimetallico e vite in satellite