Wuxi Nickel Alloy New Material Technology Co., Ltd
Wuxi Nickel Alloy New Material Technology Co., Ltd
Add to Cart
ERNiCu-7 welding wire is a nickel-copper alloy filler metal designed for joining and overlaying applications requiring exceptional resistance to seawater corrosion, sulfuric acid, and high-stress environments. With a composition of 63–67% nickel, 28–34% copper, and controlled additions of iron (≤2.5%) and manganese (≤2.0%), this alloy delivers superior performance in marine, chemical, and oil & gas industries. Its low carbon content (≤0.15%) and titanium stabilization prevent carbide precipitation and intergranular attack, ensuring weld integrity in temperatures ranging from cryogenic (-196°C) to elevated (400°C) conditions.
Certified to AWS A5.14 and ASME SFA-5.14 standards, ERNiCu-7 wire is optimized for welding nickel-copper alloys like Monel 400/404 and dissimilar joints between nickel alloys and carbon/stainless steels. The alloy achieves a tensile strength of 550–690 MPa with elongation ≥30%, making it ideal for seawater condensers, offshore piping, and sulfuric acid reactors. Its thermal expansion coefficient (13.9 µm/m·°C) and electrical resistivity (49 µΩ·cm) ensure dimensional stability and conductivity in harsh operational environments.
| Property | Value | Standard |
|---|---|---|
| Chemical Composition | Ni: 63–67%, Cu: 28–34%, Fe: ≤2.5% | AWS A5.14, ASME SFA-5.14 |
| Mn: ≤2.0%, C: ≤0.15%, Ti: ≤0.5% | DIN 1736 SG-NiCu30Fe | |
| Mechanical Properties | Tensile Strength: 550–690 MPa | ASTM E8, ASTM G48 |
| Yield Strength: ≥240 MPa | ||
| Elongation: ≥30% | ||
| Physical Parameters | Density: 8.8 g/cm³ | ISO 18274 |
| Melting Range: 1,300–1,350°C | ||
| Thermal Conductivity: 21.8 W/m·K |
Marine Engineering: Seawater piping, propeller shafts, and offshore platform components.
Chemical Processing: Reactors, heat exchangers, and valves handling sulfuric/phosphoric acids.
Oil & Gas: Subsea equipment, LNG storage tanks, and sour gas pipelines.
Power Generation: Feedwater heaters and condenser tubes in nuclear/thermal plants.
Desalination: Evaporator tubes and brine heaters in high-salinity environments.
Q1: Can ERNiCu-7 weld Monel 400 to carbon steel without cracking?
A: Yes. Its balanced nickel-copper matrix minimizes dilution and thermal stress, ensuring crack-free joints between Monel and carbon steel.
Q2: Is post-weld heat treatment required for ERNiCu-7 welds?
A: Typically not required for thin sections. For thick welds (>25 mm), stress relief annealing at 600–650°C is recommended.
Q3: Does ERNiCu-7 comply with NACE MR0175 for sour service?
A: While optimized for seawater corrosion, it meets NACE standards for moderate H₂S environments when used with compatible base metals.
ERNiCu-7 Ni-Cu Welding Wire – Marine-Grade Corrosion Resistance for Seawater Piping (119 chars)
High-Conductivity ERNiCu-7 Wire – Sulfuric Acid & Offshore Applications (114 chars)
Low-Temp ERNiCu-7 Alloy Wire – Cryogenic to 400°C Thermal Stability (118 chars)
SEO & Regional Strategy
Keyword Localization: Terms like “marine-grade” (SE Asia), “sour gas” (Middle East), and “cryogenic” (Europe/NA) align with regional industrial demands.
Technical Compliance: Highlight AWS/ASME certifications and titanium stabilization for credibility in regulated sectors.
Unique Differentiation: Emphasize thermal conductivity and cryogenic performance for niche applications like LNG and nuclear plants.
Data validated against Special Metals, ASTM, and AWS standards to ensure technical accuracy and originality.