UNS Number C70600

Cupro Nickel 90/10 is a 90% copper, 10% nickel alloy that also contains small but important additions of iron and manganese to enhance overall strength corrosion resistance. This, combined with high ductility and toughness, makes it a popular grade for marine, architectural and industrial applications.
90/10 alloy offers designers and specifiers excellent resistance to stress corrosion, erosion, and biofouling in seawater and brackish water, excellent fabrication and welding properties, a high resistance to hydrogen embrittlement and the retention of mechanical properties down to cryogenic temperatures.

Available Forms of Cupro Nickel 90/10 at Rooplaxmi Steels:

•           Bar
•           Sheet
•           Plate
•           Pipe & Tube (welded and seamless)
•           Wire

Characteristics of Cupro Nickel 90/10:

•           High ductility and toughness
•           Excellent resistance to erosion and corrosion in seawater
•           Inherent resistance to biofouling
•           Excellent fabrication and welding properties
•           Retention of mechanical properties down to cryogenic temperatures

 

Cupro Nickel 90/10 Chemical Composition, %:

Cu	Ni	Fe	Mn
Balance	10	1.5	0.7

 

Application of Cupro Nickel 90/10:

•           Hydraulic lines
•           Fish cages for aquaculture
•           Heat exchangers and condensers
•           Desalination units
•           Sea water pipework
•           Tubes for power plants and ships
•           Offshore fire water systems
•           Pumps, valves, sheathing and fittings for ship hulls

 

Machining and Fabrication with Cupro Nickel 90/10:

Cupro Nickel 90/30 is annealed at temperatures between 593 and 816°C (1100 and 1500°F). They have good cold working capacity. They also have good hot forming capacity. Cupro Nickel 90/10 alloys can be welded using gas shielded arc welding, spot welding, coated metal arc welding, butt welding, oxyacetylene welding, brazing, soldering and seam welding processes. Temperatures between 843 and 954°C (1550 and 1750°F) are suitable for the forging of 90/10 copper nickel alloys. The machinability rating is 20%.

Cupro Nickel 90/10 ASTM Specification:
Specification Minima

Pipe Smls	Pipe Welded	Sheet / Plate	Bar
B466	B467	B122	B151, B122

 

Welding Wire Designations:
AWS A5.14 – Cu-Ni 90:10

 

Mechanical Properties of Cupro Nickel 90/10:

Ultimate Tensile Strength	280 N/mm2
Yield	(0.2 % offset) 105 N/mm2
Elongation	27 %