Products Description
ERNiCrMo-3 is a nickel-based alloy welding wire conforming to the AWS A5.14 classification in the American Welding Society (AWS) standard, belonging to the nickel-chromium-molybdenum (Ni-Cr-Mo) alloy system. Its chemical composition is based on nickel (Ni), with added elements such as chromium (Cr), molybdenum (Mo), and niobium (Nb), exhibiting excellent corrosion resistance, high-temperature stability, and weldability. This welding wire is widely used in nuclear power, chemical, and marine engineering fields, and is particularly suitable for welding Hastelloy C-276 (UNS N10276) and similar corrosion-resistant alloys.
Core performance characteristics
Corrosion Resistance
ERNiCrMo-3 welding wire exhibits excellent performance in extremely corrosive environments:
Resistance to localized corrosion: High resistance to pitting corrosion, crevice corrosion, and stress corrosion cracking (SCC), attributed to the synergistic effect of molybdenum (18-20%) and chromium (14-17%).
Resistance to strong acid media: Excellent performance in non-oxidizing acids such as sulfuric acid, hydrochloric acid, and phosphoric acid, while also tolerating chloride-containing (Cl⁻) environments (such as seawater and salt spray).
Oxidation-reduction dual-phase corrosion resistance: Remains stable in both oxidizing media (such as nitric acid) and reducing media (such as environments containing hydrogen sulfide).
High Temperature Performance
High Temperature Strength: Maintains high tensile strength and creep resistance even above 600℃, suitable for high-temperature and high-pressure equipment.
Oxidation Resistance: Chromium forms a dense oxide film (Cr₂O₃) at high temperatures, effectively preventing further oxidation.
Welding Processability
All-position welding: Suitable for TIG (GTAW), MIG (GMAW), and PAW (Plasma Arc Welding), especially suitable for thin plates and small-diameter pipe welding.
Low hot cracking tendency: Microalloying with niobium (Nb) suppresses the formation of welding hot cracks.
Molten pool fluidity: Moderate fluidity of the deposited metal, resulting in aesthetically pleasing weld formation, minimal spatter, and easy fusion with the base metal.
Typical Application Areas
- Nuclear Power Equipment: Welding of the inner wall of nuclear reactor pressure vessels; welding of heat transfer tubes in steam generators.
- Chemical Equipment: Sulfuric acid/hydrochloric acid reactors, heat exchangers, and highly corrosive components of catalytic cracking units.
- Marine Engineering: Seawater desalination pipelines; chloride ion corrosion-resistant structures for deep-sea drilling platforms.
- Oil and Gas: Oil and gas well pipelines containing hydrogen sulfide (H₂S); liquefied natural gas storage tanks.
Precautions
* Welding of dissimilar steels: When welding with carbon steel or stainless steel, a transition layer must be designed to prevent carbon migration and the formation of brittle phases.
* Arc characteristics: Due to the high resistivity of nickel-based alloys, a constant voltage power supply and reduced wire feed speed are required during MIG welding.
* Inspection requirements: The weld must be inspected by penetrant testing (PT) or radiographic testing (RT) to ensure the absence of porosity and incomplete fusion defects.
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