ASTM B151 CuNi 90/10 Uns C70600 C7060X Forged Flange

Copper-nickel alloys have excellent resistance to seawater corrosion, anti bio-fouling properties and ability to withstand corrosion and erosion attack. Hence copper-nickel alloys are widely used for marine offshore applications.
Typical applications include:

• Fire protection systems
• Deluge systems
• Sanitary plumbing services
• Process cooling lines
• Seawater piping
• Splash zone sheathing

• 90-10 Alloy (UNS C70600) containing 10% nickel also called Alloy 706
• 70-30 Alloy (UNS C71000) containing 30% nickel also called Alloy 710

Introduction
Copper nickel alloys are alloys that have moderate strength and thermal stability in high temperature levels. The high oxidation resistance of these alloys is visible in moist air and steam. Copper nickel alloys have 2 to 30% nickel, high oxidation resistance and stress corrosion cracking resistance.
Copper nickel alloys have good fabricability and high inherent resistance to biofouling. The addition of manganese, niobium, iron and or chromium in these alloys improves their corrosion resistance and strength.
Nickel is soluble in copper and this renders the copper nickel alloys as single phase alpha structures. The cast structures have alpha dendrites that contain huge quantities of nickel. The dendrite structure is broken by mechanical treatments. However, the alloying elements do not become homogenized even by repeated thermal and mechanical treatments.
Copper nickel alloys are of two types that include 90/10 and 70/30. The 90/10 alloys are widely used as they are inexpensive. The 90/10 copper nickel alloys have great resistance to sea water corrosion due to the presence of significant amounts of manganese and iron.
Copper nickel alloys are used in the following applications:

• 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

Fabrication and Heat Treatment
Annealing
UNS C70600 copper nickel alloys are annealed at temperatures between 593 and 816°C (1100 and 1500°F)
Cold Working
UNS C70600 copper nickel alloys have good cold working capacity.
Hot Working
Copper nickel 90/10 alloys have good hot forming capacity.
Welding
Copper 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.
Forging
Temperatures between 843 and 954°C (1550 and 1750°F) are suitable for the forging of 90/10 copper nickel alloys.
Machinability
The machinability rating of copper nickel 90/10 alloys is 20%.
Applications
UNS C70600 copper nickel alloys are used in areas where stainless steel cannot be used due to chloride stress-corrosion cracking and in other parts requiring high levels of corrosion resistance. These alloys are also used as machined and forged valve and pump parts that are utilized for seawater services.

DN15-DN600
Maximum weight 500KGS
5,000tons production annual year

ANSI B16.5,ANSI B16.47 Series A&B,ANSI B16.48,ANSI B16.36
BS4504,BS3293
DIN86037,DIN 86033,DIN2633,DIN2632,DIN 86036
EN1092-1
GOST
EEMUA145