ERCoCr-A Flux-Cored Wire (Cobalt Alloy 6 Gas-Shielded / Open-Arc Hardfacing Wire)

1. Description & Applications

ERCoCr-A Flux-Cored Wire is a tubular composite hardfacing wire that deposits a cobalt-base alloy equivalent to Stellite 6 (CoCr-A). It combines the legendary wear, corrosion, and high-temperature resistance of cobalt alloys with the high deposition efficiency and productivity of flux-cored welding wire. The weld deposit provides outstanding resistance to metal-to-metal wear, high-temperature oxidation, severe thermal shock, and cavitation erosion up to 800°C (1472°F).

Key Applications:

• High-pressure and high-temperature valve seats, gates, and plugs

• Continuous casting rolls, hot shearing blades, and piercing plugs

• Steam turbine valves and chemical processing components

• Industrial mixing screws, pump shafts, and agricultural wear parts

Classification: AWS A5.21 ECoCr-A equivalent (Tubular Flux-Cored Hardfacing Wire)

Product Type: Cobalt-Based Hardfacing Wire for FCAW / GMAW

2. Nominal Chemical Composition of Weld Deposit (wt%)

3. Mechanical & Deposit Properties (As-Welded)

• Hardness (As-Welded): 38 – 44 HRC (typical for multi-layer deposits)

• High-Temperature Hardness: Retains excellent hardness and structural integrity up to 650°C (1200°F)

• Deposit Microstructure: Austenitic solid-solution matrix reinforced with primary chromium and tungsten carbides

• Machinability: Machinable with carbide tooling; precision finishing is best accomplished by grinding

4. Recommended Welding Parameters (FCAW-G / Gas-Shielded)

• Shielding Gas: 80% Argon + 20% $\text{CO}_2$ (or 100% Argon depending on application), Flow rate: 15–25 L/min

• Current Type: DCEP (Direct Current Electrode Positive)