Copper Nickel Flange, Tube Sheet, Brass Blind Flange C70600, C7060X, C71500, Cu90ni10 and Bfe30-1-1, CuNi90/10 CuNi70/30, Flange
TianYuan(HK) International Limited
Shanghai, China
Last Login Date:
Jun 18, 2025
Main Products:
Forged Flange, ASME B16.5 B16.47A/B En1092-1 GOST DIN Flange, Carbon Steel Flange, Stainless Steel Flange, Copper Nickel Flange, ASTM A182 F304/L F316/L Flange, ASTM A105 A350lf2 A694 F65 F70 Flange, Welding Neck Flange, Blind Slip on Threaded Socket Weld Lap Joint
Product Description
Company Info
Basic Info.
Product Description
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
The corrosion resistance of CuNi alloys is due to the presence of protective surface film of copper nickel oxide which is firmly bonded to the metal and which is almost insoluble in water. This oxide film protects the piping from further attack. The protective oxide film takes about three months to stabilize. Hence it is recommended not to expose newly fabricated copper-nickel piping to aggressive environments. The corrosion rate in static seawater is approximately 0.1 mm/year. Once the protective film is formed the rate of corrosion is reduced to 0.01 mm/year. The corrosion rate dramatically increases in presence of sour environment such as H2S due to breaking of protective oxide film by sulphide ions.
In systems which are in continuous service, too high fluid velocities can break the protective film due to erosion. The copper oxide film can get destroyed by erosion at fluid velocities of about 3.5 m/s. To limit the erosional velocities, copper-nickel piping systems could have larger diameters than equivalent steel piping systems.
Commonly used copper-nickel alloys
The following two alloys of copper-nickel are most commonly used in the industry.
- 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
Chemical Composition
The chemical composition of UNS C70600 copper nickel alloys is outlined in the following table.
| Element | Content (%) |
| Cu | 88.7 |
| Fe | 1.3 |
| Ni | 10.0 |
The following table shows the physical properties of UNS C70600 copper nickel alloys.
| Properties | Metric | Imperial |
| Density | 8.94 g/cm3 | 0.323 lb/in3 |
The mechanical properties of UNS C70600 copper nickel alloys are displayed in the following table.
| Properties | Metric | Imperial |
| Tensile strength, ultimate | 303-414 MPa | 43900-60000 psi |
| Tensile strength, yield (depending on temper) | 110-393 MPa | 16000-57000 psi |
| Elongation at break (in 254 mm) | 42.00% | 42.00% |
| Machinability (UNS C36000 (free-cutting brass) = 100%) | 20% | 20% |
| Shear modulus | 52.0 GPa | 7540 ksi |
| Poisson's ratio | 0.34 | 0.34 |
| Elastic modulus | 140 GPa | 20300 ksi |
Equivalent materials to UNS C70600 copper nickel alloys are:
| ASME SB111 | ASTM B111 | ASTM B466 | ASME SB171 |
| ASME SB359 | ASTM B122 | ASTM B469 | MIL T-22214 |
| ASME SB395 | ASTM B151 | ASTM B543 | SAE J461 |
| ASME SB466 | ASTM B171 | ASTM B608 | SAE J463 |
| ASME SB467 | ASTM B359 | DIN 2.0872 | MIL T-16420 |
| ASME SB543 | ASTM B395 | MIL C-15726 | MIL T-15005 |
| ASTM B432 |
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
EN10204-3.2 byTUV,BV,Lloyds,GL,DNV,SGS,ABS,RINA,Moody or other third parties
