ASTM B151 CuNi 70/30 Uns C71500 Forged 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 have very good resistance to biofouling and marine corrosion, and possess good fabricability. Copper gains more strength and corrosion resistance when nickel is added to it.
UNS C71500 copper-nickel (cupronickel) alloy has medium high strength and good creep resistance at high temperatures. This alloy is expensive in comparison with copper-aluminum alloys and other alloys with similar mechanical properties.
The following datasheet will provide more details about the UNS C71500 cupronickel-copper nickel alloy.
Chemical Composition
The following table shows the chemical composition of UNS C71500 cupronickel alloy.
| Element | Content (%) |
| Copper, Cu | 70 |
| Nickel, Ni | 30 |
The physical properties of UNS C71500 cupronickel alloy are outlined in the following table.
| Properties | Metric | Imperial |
| Density | 8.94 g/cm3 | 0.323 lb/in3 |
| Melting point | 1171°C | 2140°F |
The mechanical properties of UNS C71500 cupronickel alloy are tabulated below.
| Properties | Metric | Imperial |
| Tensile strength | 372-517 MPa | 54000-75000 psi |
| Yield strength (depending on temper) | 88.0-483 MPa | 12800-70100 psi |
| Elongation at break (in 381 mm) | 45% | 45% |
| Elastic modulus | 117 GPa | 17000 ksi |
| Poisson's ratio | 0.34 | 0.34 |
| Machinability (UNS C36000 (free-cutting brass) = 100) | 20 | 20 |
| Shear modulus | 57.0 GPa | 8270 ksi |
The thermal properties of UNS C71500 cupronickel alloy are tabulated below.
| Properties | Metric | Imperial |
| Thermal expansion co-efficient (@20-300°C/68-572°F) | 16.2 µm/m°C | 9 µin/in°F |
| Thermal conductivity (@20°C/ 68°F ) | 29 W/mK | 201 BTU in/hr.ft².°F |
Equivalent materials to UNS C71500 cupronickel alloy are:
| ASME SB111 | ASTM B111 | ASTM B466 | MIL C-15726 |
| ASME SB171 | ASTM B122 | ASTM B543 | MIL T-15005 |
| ASME SB359 | ASTM B151 | ASTM B552 | MIL T-16420 |
| ASME SB395 | ASTM B171 | ASTM B608 | MIL T-22214 |
| ASME SB466 | ASTM B359 | ASTM F467 | SAE J461 |
| ASME SB467 | ASTM B395 | ASTM F468 | SAE J463 |
| ASME SB543 | ASTM B432 | DIN 2.0882 |
Fabrication and Heat Treatment
Machinability
The machinability rate of UNS C71500 cupronickel nickel alloy is 20.
Welding
Soldering, brazing, oxyacetylene welding, gas shielded arc welding, coated metal arc welding, spot welding, seam welding, and butt welding are considered as suitable welding processes for UNS C71500 alloy.
Hot Working
The hot working capacity of UNS C71500 copper nickel alloy is rated as good with the suitable hot working temperature being between 927 and 1038°C (1700 and 1900°F).
Cold Working
The cold working capacity of UNS C71500 is good.
Annealing
The annealing temperature of UNS C71500 copper nickel alloy is between 649 and 816°C (1200 and 1500°F).
Applications
The UNS C71500 cupronickel alloy is primarily used in seawater operations requiring forged and machined pump and valve components, hardware and fittings. This alloy can also be widely used in areas requiring high corrosion resistance, and where chloride stress-corrosion cracking precautions prevent usage of stainless steels.
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
