ERNiCrMo-4 (AWS Class) is a high-performance, low-carbon, nickel-chromium-molybdenum welding filler metal (like Alloy C-276) known for exceptional corrosion resistance, especially to pitting, crevice corrosion, and stress corrosion cracking in aggressive chemical environments, used for welding similar nickel alloys, dissimilar metals (like stainless steels), and for cladding, in industries like chemical processing, oil & gas, and pollution control.
Key Characteristics & Composition
Base Alloy: Primarily Nickel (Ni), Chromium (Cr), and Molybdenum (Mo), with added Tungsten (W).
Corrosion Resistance: Excellent in highly corrosive media, including reducing and oxidizing conditions, due to its high Mo content.
Mechanical Properties: Offers good strength, ductility, and weldability, with high tensile strength in the base material.
Primary Applications
Chemical Processing: Welding pumps, valves, pipelines, and vessels in harsh chemical environments.
Oil & Gas: Offshore equipment and downhole components.
Pollution Control: Flue gas desulfurization (FGD) systems.
Pulp & Paper: Bleaching equipment.
Dissimilar Welding: Joining nickel alloys to stainless steels or other steels.
Surfacing/Cladding: Applying a corrosion-resistant layer to steel.
Welding Methods
Used as TIG (GTAW) wire, MIG (GMAW) wire, and sometimes SAW.
Typically uses Argon shielding gas and DC electrode negative (DCEN) current.
In essence, ERNiCrMo-4 provides robust, long-lasting welds in demanding industrial settings where standard steels or other alloys would quickly fail due to corrosion
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