ERNiCr-4 Features and Applications

ERNiCr-4 is a high-performance nickel-chromium alloy welding wire designed for extreme high-temperature and corrosive environments, widely used in energy, chemical, and aerospace industries. Below are its core features and typical applications:

I. Key Characteristics of ERNiCr-4

1. Chemical Composition and Material Advantages

   • High Ni-Cr Content: Chromium (30%-40%), Nickel (60%-70%), supplemented with aluminum (Al), titanium (Ti), and other strengthening elements. Combines excellent high-temperature oxidation resistance, sulfur/vanadium corrosion resistance, and superior mechanical properties.
   • Process Adaptability: Compatible with TIG, MIG, and submerged arc welding (SAW). Exhibits low hot-cracking susceptibility and excellent post-weld ductility.

2. Extreme Environment Resistance

   • High-Temperature Performance: Stable operation up to 650°C (long-term) and short-term tolerance up to 900°C, ideal for hot shear blades, high-temperature valves, and similar components.
   • Corrosion Resistance: Exceptional resistance to sulfur-laden fuel ash, vanadium compounds, dilute sulfuric acid, hydrochloric acid, and other aggressive media.

3. Welding Process Control

   • Recommended parameters: Low heat input (small current, narrow weld passes) with high-purity argon shielding (10-15 L/min flow rate).
   • Pre-weld cleaning is critical to remove contaminants. Post-weld stress relief via peening or water quenching enhances joint integrity.

II. Typical Applications of ERNiCr-4

1. High-Temperature Equipment Fabrication and Repair

   • Energy Sector: Nuclear reactor internals, coal-fired power plant steam pipelines, gas turbine combustion chambers.
   • Petrochemical Industry: Pyrolysis furnace tubes, high-pressure valves, wear-resistant coatings for chemical fiber cutting blades.
   • Aerospace: Engine hot-section components, rocket fuel tank welding.

2. Dissimilar Material Welding

   • Enables robust joints between nickel-based alloys (e.g., INCONEL 690), stainless steel, and carbon steel, mitigating stress from thermal expansion mismatches.

3. Corrosion-Resistant Overlays

   • Deposited on carbon steel or stainless steel substrates to form high-temperature corrosion-resistant layers, significantly extending equipment service life.

III. Selection and Technical Support

• Material Selection: Optimize performance by pairing ERNiCr-4 with compatible fluxes (e.g., INCOFLUX series for submerged arc welding).

IV. Summary

ERNiCr-4 is a premier choice for high-temperature corrosion resistance and complex welding scenarios, leveraging its high Ni-Cr content and exceptional processability. By optimizing welding parameters and material pairings, its full potential in durability and performance can be unlocked.