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Postalloy 2501: Conforms to AWS CoCr-C. A high hardness cobalt base alloy with outstanding resistance to abrasion, oxidation, erosion and corrosion. Deposits are harder than 2506 and 2512, and is especially recommended for metal-to-metal wear. Deposits are highly resistant to galling, retain their high hardness at red heat, and recover full hardness after exposure to temperatures as high as 1500°F(816°C) The higher hardness also means
a greater tendency to relief check upon cooling. Deposits are non-machinable. Uses include the overlay of extrusion screw conveyors, valve systems and bearings. |
Hardness ( 2 layers ) Bare Rods: 52 – 57 Rc Arc Welding: 48 – 56 Rc Bare Solid Rods-1/8, 5/32, 3/16 Flux-Coated Electrodes – 1/8, 5/32, 3/16 Metal-Cored, Gas-Shielded Wire - .045, 1/16 |
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Postalloy 2506: Conforms to AWS CoCr-A. Cobalt base alloy with excellent resistance to mechanical wear and corrosion over a wide temperature range. It retains an effective hardness even up to 1500°F(816°C). Offers outstanding self-mating, anti-galling properties and it is effective when abrasion is
accompanied by thermal shock or impact. Deposits are machinable. Crack-free deposits can be made with proper preheat, postheat and interpass temperature. Uses include overlays on valves, hot shear blades, punches, chain-saw bars. |
Hardness ( 2 layers ) Bare Rods: 39 - 45 Rc Arc Welding: 35 - 42 Rc Bare Solid Rods-.045, 1/16, 3/32, 1/8, 5/32, 3/16 Flux-Coated Electrodes – 1/8, 5/32, 3/16 Metal-Cored, Gas-Shielded Wire - .045, 1/16 |
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Postalloy 2512: Conforms to AWS CoCr-B. Slightly harder and more wear resistant than 2506-SPL, but its impact resistance is somewhat lower. Also tougher to machine. Weld deposits also have a greater tendency to relief check if welding procedures are not closely monitored. Uses include overlays on screw conveyors and augers in the rubber and plastic industry, gas and diesel engine components, extrusion screws and various valves. |
Hardness ( 2 layers ) Bare Rods: 45 - 50 Rc Arc Welding: 39 - 47 Rc Available Forms |
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Postalloy 2521: Cobalt base alloy offering good strength and toughness at elevated temperatures. It resists oxidizing and reducing atmospheres up to 2100°F(1149°C). Postalloy 2521 also provides excellent resistance to corrosive environments, and outstanding resistance to cavitation and thermal shock. Deposits have very little tendency to relief check and are fully machinable. Uses include overlays on hot extrusion and forging dies, trimmers, punches and hot shear blades, and components in molten zinc baths (galvanizing). |
Hardness ( 2 layers ) Bare Rods: as deposited 25 – 30 Rc work-hardens to 45 Rc Arc Welding: as deposited 25 – 30 Rc work-hardens to 45 Rc Available Forms Bare Solid Rods –1/8, 5/32, 3/16 |
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Postalloy 2540: High hardness cobalt overlay. Deposits offer an excellent combination of abrasion and corrosion resistance. Uses include the hardfacing of pump parts used in corrosive conditions. |
Hardness ( 2 layers ): 50 - 54 Rc Metal-Cored, Gas-Shielded Wire - 1/16 |