Cupro Nickel 70/30 is a copper nickel alloy noted for its excellent resistance to corrosion, erosion and pitting combined with a good strength, workability and weldability. It has enjoyed a long and successful history in the marine sector that has since extended to industries including offshore oil and gas, power generation, desalination and cooling plants
Available Forms of Cupro Nickel 70/30 at Rooplaxmi Steels:
• Bar
• Sheet
• Plate
• Pipe & Tube (welded and seamless)
• Wire
Characteristics of Cupro Nickel 70/30:
• Excellent corrosion and pitting resistance in marine environments
• Good strength and toughness
• Resistance to biofouling
• Readily weldable and fabricated
Cupro Nickel 70/30 Chemical Composition, %:
Cu |
Ni |
Mn |
Balance |
30 |
1 |
Application of Cupro Nickel 70/30:
• Desalination units
• Hydraulic lines
• Fish cages for aquaculture
• Heat exchangers and condensers
• Sea water pipework
• Offshore fire water systems
• Tubes for power plants and ships
• Pumps, valves, sheathing and fittings for ship hulls
Machining and Fabrication with Cupro Nickel 70/30:
Cupro Nickel 70/30 is annealed at temperatures between 649 and 816°C (1200 and 1500°F). They have good cold working capacity. They are hot formed in an excellent manner. Cupro nickel 70/30 alloys can be welded using gas shielded arc welding, spot welding, coated metal arc welding, butt welding, seam welding, brazing, soldering and oxyacetylene welding processes. Temperatures between 927 and 1038°C (1700 and 1900°F) are suitable for forging of 70/30 copper nickel alloys. The machinability rating is 20%.
Cupro Nickel 70/30 ASTM Specification:
Pipe Smls |
Pipe |
Tube Smls |
Tube |
Sheet / Plate |
Bar |
B466 |
B608 |
B466 |
B543 |
B122 |
B122 |
Welding Wire Designations:
AWS A5.14 – Cu-Ni 70:30
Mechanical Properties of Cupro Nickel 70/30:
Specification Minima
Tensile Strength |
350 N/mm2 |
Yield |
(0.2 % offset) 125 N/mm2 |
Elongation |
35 % |