ERNiCu-7 Nickel-Copper Welding Wire – High-Strength Corrosion Resistance for Marine & Chemical Environments

Description

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.

Technical Specifications (Table)

Applications

1. Marine Engineering: Seawater piping, propeller shafts, and offshore platform components.

2. Chemical Processing: Reactors, heat exchangers, and valves handling sulfuric/phosphoric acids.

3. Oil & Gas: Subsea equipment, LNG storage tanks, and sour gas pipelines.

4. Power Generation: Feedwater heaters and condenser tubes in nuclear/thermal plants.

5. Desalination: Evaporator tubes and brine heaters in high-salinity environments.

Q&A

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.

Product Titles

1. ERNiCu-7 Ni-Cu Welding Wire – Marine-Grade Corrosion Resistance for Seawater Piping (119 chars)

2. High-Conductivity ERNiCu-7 Wire – Sulfuric Acid & Offshore Applications (114 chars)

3. 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.

Wuxi Nickel New Material Co., Ltd. is a high-tech enterprise integrating the production, manufacturing, and research & development of specialty alloy materials. Located in Wuxi, Jiangsu Province, the company specializes in precision alloys, titanium alloys, high-temperature alloys, corrosion-resistant alloys, heat-resistant steels, nickel-based welding wires, and other specialty materials, with an annual production capacity of 5,000 tonnes. Our product range includes plates, bars, wires, and strips, which are widely used in industrial electric furnaces, power‐station boilers, petrochemical plants, aerospace, marine engineering, machinery, and electronic instrumentation. These materials are characterized by high electrical resistance, high‐temperature strength, corrosion resistance, wear resistance, and fatigue resistance. We can manufacture in compliance with national, industry, and international standards, and are also able to tailor products to meet specific customer requirements.
The company is committed to improving and enhancing its production infrastructure all year round, with a full range of production and processing equipment including vacuum smelting, hot processing, cold processing, and heat treatment. It also has various physical and chemical analysis testing facilities such as spectrometers to ensure product quality. The company has a high-quality R&D, production, and management team that is fully capable of meeting the complex requirements of the current market for material diversification, refinement, and functionalization. Our company is particularly skilled in developing and producing "specialized materials" that are suitable for the market and specific customer needs, which will be one of our company's characteristics. The company adheres to the business philosophy of "guided by market demand, driven by technological progress, and committed to optimizing and innovating materials to create greater value for customers", serving society and the market.