ERNiCrFe-7（A）：nuclear power plant welding material
ERNiCrFe-7 welding wire is a widely used nickel-chromium-iron alloy welding wire, particularly suitable for use in harsh operating conditions such as high temperatures and corrosion. It is often used for welding critical structures such as the main equipment in the nuclear island of nuclear power plants.ERNiCrFe-7—First understand the basic version of ERNiCrFe-7(A)
ERNiCrFe-7（A）Core information:
❶ Chemical Composition: It is nickel (Ni)-based, contains chromium (Cr) for corrosion resistance, and niobium (Nb) for crack resistance. Specifically, the nickel content is at least 59%, the chromium content is between 14.0% and 17.0%, and the iron content is between 6.0% and 10.0%. It also contains elements such as niobium, aluminum, and titanium.
❷ Key Features:
⑴ Excellent high-temperature and corrosion resistance: Resists high-temperature oxidation (up to approximately 1100°C), high-temperature aqueous corrosion, and stress corrosion cracking.
⑵ Excellent weldability: Niobium significantly reduces weld hot crack susceptibility, resulting in a wide welding process window.
⑶ Broad material compatibility: Suitable for welding similar nickel-based alloys, as well as nickel-based alloys with dissimilar metals such as stainless steel and carbon steel.
❸ Typical applications: Nuclear power equipment (such as steam generators and reactor pressure vessels), petrochemicals (such as high-temperature cracking furnace tubes), energy and power, and heat treatment industries.
ERNiCrFe-7（A）：Welding and Purchasing Recommendations
❶ Key Welding Techniques
⑴ Pre-weld Cleaning: Thoroughly remove oil, moisture, and oxides from the base material and welding wire surfaces.
⑵ Shielding Gas: Pure argon (Ar) or an argon-helium mixture is recommended.
⑶ Interpass Temperature: It is recommended to keep the temperature below 150°C to avoid overheating of the weld.
⑷ Heat Input Control: Optimize heat input and narrow weld bead techniques.
❷Purchasing Considerations
⑴ Verify Standards and Certifications: When purchasing, confirm that the product complies with standards such as AWS A5.14 and request a Certificate of Authenticity (CoA) from the supplier. Pay special attention to the content of key elements such as chromium (Cr) and niobium (Nb), as well as the control of impurities such as sulfur (S) and phosphorus (P).
⑵ Investigate Supplier Qualifications: For critical sectors such as nuclear power, it is recommended to prioritize suppliers with proven nuclear industry application records and relevant certifications.
⑶ Pay attention to welding wire quality control: Check that the wire surface is smooth and clean, and that the packaging is moisture-proof (e.g., vacuum-sealed).
💎 Advanced Note: ERNiCrFe-7A Nuclear-Grade Welding Wire
ERNiCrFe-7A Core Data ：https://www.akweld.com/wp-content/uploads/2025/08/ERNiCrFe-7A.pdf
You may also encounter ERNiCrFe-7A in your search. This is a nuclear-grade, improved version of ERNiCrFe-7. It has undergone more rigorous performance verification, meets the technical requirements of the main equipment in the nuclear island of third-generation nuclear power plants, and boasts a high level of technical maturity. Research has shown that the mechanical properties and intergranular corrosion resistance of the deposited metal of our company’s ERNiCrFe-7A welding wire are comparable to similar products from abroad. Therefore, ERNiCrFe-7A should be selected in situations with more stringent requirements such as nuclear-grade applications.