ARK Stainless Inc. is a trusted manufacturer and supplier of high-quality Copper Nickel Buttweld Fittings, engineered for outstanding durability, excellent resistance to seawater corrosion, and superior mechanical performance in demanding marine and offshore environments. These fittings are particularly suitable for shipbuilding, desalination, and cooling systems due to their resilience against biofouling and stress corrosion cracking.
Manufactured using premium Copper Nickel alloys such as 70/30 (C71500) and 90/10 (C70600), our buttweld fittings are developed with precise dimensional accuracy and smooth surface finish. The fittings are available in a variety of types including Seamless, Welded, Fabricated, and ERW, and are produced in compliance with international standards such as ASTM B466 / ASME SB466 and dimensional norms like ASME B16.9, B16.28, and MSS-SP-43.
Copper Nickel Buttweld Fittings from ARK Stainless Inc. are well-suited for high-pressure and high-temperature applications. They offer a perfect balance of strength, thermal conductivity, and corrosion resistance—particularly in saltwater and other aggressive media. Every fitting undergoes stringent testing and inspection to ensure long service life and reliable performance in critical systems.
| Grade | Cu | Mn | Pb | Ni | Fe | Zn |
|---|---|---|---|---|---|---|
| Cu-Ni 70-30 | 65.0 min | 1 max | .05 max | 29-33 | 0.4-1.0 | 1 max |
| Cu-Ni 90-10 | 88.6 min | 1.0 max | .05 max | 9-11 max | 1.8 max | 1 max |
| Grade | Tensile Strength (Ultimate) | Tensile Strength (Yield) | Elongation at Break | Charpy Impact | Machinability (%) | Shear Modulus | Poisson's Ratio | Elastic Modulus |
|---|---|---|---|---|---|---|---|---|
| Cu-Ni 70/30 | 372–517 MPa / 54000–75000 psi | 88.0–483 MPa / 12800–70100 psi | 45.0% (in 381 mm) | 107 J / 78.9 ft-lb | 20% | 57.0 GPa / 8270 ksi | 0.34 | 150 GPa / 21800 ksi |
| Cu-Ni 90/10 | 303–414 MPa / 43900–60000 psi | 110–393 MPa / 16000–57000 psi | 42.0% (in 254 mm) | — | 20% | 52.0 GPa / 7540 ksi | 0.34 | 140 GPa / 20300 ksi |
Copper Nickel 70/30 Buttweld Fittings is suitable for the use in many of the industries and general works like offshore oil drilling companies, pharmaceutical industry, chemical equipment, Gas processing, Rail components, road appliances, water industries, mining industries, transport industries, and agricultural industry as well.
Copper Nickel 70/30 Buttweld Fittings are readily made with the heat treatment, fabricated, cold worked, and welding process. The addition of the iron and manganese in the fitting offers the extra maintenance strength and great strength to resist the entire general corrosions. These fittings are suitable for use in chemical and food processing. These fittings are manufactured with the high quality of the raw material for the better performance in the hostile and chemical environments without deformation to the fittings.
| STANDARD | UNS | WNR. |
|---|---|---|
| Copper Nickel 70/30 | C71500 | 2.0882 |
Copper Nickel 90/10 Buttweld Fittings is suitable for the sue in many of the general works and industries like paper industry, pulp industry, specialty chemical industry, food processing, pharmaceutical industry, heat exchangers, condensers, seawater equipment pharmaceutical equipment, offshore oil drilling companies, petrochemical industry, power generation industry, and chemical equipments.
Copper Nickel 90/10 Buttweld Fittings offers amazing qualities like corrosion resistance, ready welding, machinability, workability, durability, ductility, and resistance from the chloride environments. These fittings are reliably suitable fittings to be useful in corrosion environments. These fittings are made with the heat treatment and welding process for the great sustainability in the harsh environments without any deformation to the fittings. These fittings are often suitable for manufacturing the sheathing, valves, pumps, and shafts.
| STANDARD | UNS | WNR. |
|---|---|---|
| Copper Nickel 90/10 | C70600 | 2.0872 |
