C71500 Copper Nickel "70/30" (CDA 715)
ASTM B151, ASTM B466, ASTM B111, ASTM B171, ASME SB466, ASME SB111, ASME SB151, ASME SB171, DIN 2.0872, BS 2871 CN102, EN CW352H, MIL-C-1726F, MIL-C-24679, MIL-T-16420K
Cu-Ni 70/30 has a Poisson’s Ratio of 0.325. The most popular specifications of 70/30 are the C71500 and CN107 designations. 70/30 Copper nickel is used in salt water piping and pipe fittings, refrigerator and condenser components, weld wire and boiler parts, salt water flanges, heat exchanger and cooling plants, welding backing rings, etc. Copper nickel 70/30 price can be easily determined by going online and searching for the same. Copper nickel has a Tensile Strength of 359 MPa (52000 psi). The Shear Modulus of Copper nickel is 57.2 GPa (8300 ksi). CuNi is the Molecular Formula of Copper nickel. Copper Nickel 70/30 can be readily welded, fabricated and cold worked, without the use of any special materials.
Copper nickel 70 30 thermal conductivity is 29 W/(m·K). The Elongation at Break of Copper nickel (rolled-H04 for flat products/hard drawn-H80 for tubing), is 11.00% and its Elongation at Break (annealed), is 40%. The Density of 70/30 Copper nickel is 0.323 lb/in³ (8.94 g/cm3). Cupro Nickel 70/30 contains 70% copper and 30% nickel. It also has a small amount of manganese and iron in it, making it more resistant to erosion and corrosion. The resistance of 70/30 CuNi has been found to be much better in polluted seawater and in high-velocity waters (up to 4.5m/s). Related Specifications of 70/30 are C71500, DEF STAN 02-879 Annex B, BS2874, CuNi30Mn1Fe, CN107, NES780, DGS320, C71520, EN 12164, CW354H, ASTM B151, DEF STAN 02-780 and 2.0882.
Applications of 70/30
Offshore & marine | Salt water flanges, salt water piping and pipe fittings, valve bodies, sea water intakes, pipe fittings, water boxes, propeller sleeves, pump bodies and parts
Chemical processing | Heat exchanger and cooling plant, evaporator tubes, distiller tubes, refrigerator and condenser components
Other | Welding backing rings, flexible metal hose, weld wire and boiler parts
Key Features of 70/30
- Excellent corrosion and pitting resistance in marine environments
- Good strength and toughness
- Resistance to biofouling
- Readily weldable and fabricated
Copper Nickel 70/30 properties
Copper Nickel 70/30 Chemical Composition
| Element | ||||||
|---|---|---|---|---|---|---|
| Cu(1,2) | Pb | Zn | Fe | Ni(3) | Mn | |
| (1) Cu + Sum of Named Elements 99.5% min.(2) Cu value includes Ag.(3) Ni value includes Co. | ||||||
| Min (%) | 0.40 | 29.0 | ||||
| Max (%) | Rem | 0.05 | 1.0 | 1.0 | 33.0 | 1.0 |
Copper Nickel 70/30 Mechanical Properties*
| Form | Temper | Temper Code | Tensile Strength (ksi) | YS-0.5% Ext (ksi) | Elongation (%) | Rockwell B scale | Rockwell F scale | Section Size (in) | Cold Work (%) |
|---|---|---|---|---|---|---|---|---|---|
| Flat Products | As Hot Rolled | M20 | 55 Typ | 20 Typ | 45 Typ | 35 Typ | 1 | ||
| Rod | 1/2 Hard | H02 | 75 Typ | 70 Typ | 15 Typ | 80 Typ | 1 | 20 | |
| Tube | Nominal Grain Size 0.025 mm | OS025 | 60 Typ | 25 Typ | 45 Typ | 45 Typ | 80 Typ | ||
| Nominal Grain Size 0.035 mm | OS035 | 54 Typ | 45 Typ | 36 Typ | 77 Typ | ||||
| * Measured at room temperature, 68°F (20°C). | |||||||||
Cupro Nickel 70/30 Physical Properties
| Melting Point - Liquidus°F | 2260 |
|---|---|
| Melting Point - Solidus°F | 2140 |
| Densitylb/cu in. at 68°F | 0.323 |
| Specific Gravity | 8.94 |
| Electrical Conductivity% IACS at 68°F | 4.6 |
| Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F | 17 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 9 |
| Specific Heat CapacityBtu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tensionksi | 22000 |
| Modulus of Rigidityksi | 8300 |
CUNI 70/30 Fabrication Properties
| Technique | Suitability |
|---|---|
| Soldering | Excellent |
| Brazing | Excellent |
| Oxyacetylene Welding | Good |
| Gas Shielded Arc Welding | Excellent |
| Coated Metal Arc Welding | Excellent |
| Spot Weld | Excellent |
| Seam Weld | Excellent |
| Butt Weld | Excellent |
| Capacity for Being Cold Worked | Good |
| Capacity for Being Hot Formed | Good |
| Machinability Rating | 20 |
Common Fabrication Processes of Cu-Ni 70/30
- Forming and Bending
- Welding
Copper Nickel 70/30 Thermal Properties
| Treatment | Minimum* | Maximum* | |||
|---|---|---|---|---|---|
| * Temperature is measured in Fahrenheit. | |||||
| Annealing | 1200 | 1500 | |||
| Hot Treatment | 1700 | 1900 | |||
Cupro Nickel 70/30 Applicable Specifications
| Form | Specific Sub-Form | Application | System | Standard |
|---|---|---|---|---|
| Bar | ASTM | B122/B122M | ||
| ASTM | B151/B151M | |||
| MILITARY | MIL-C-15726 | |||
| SAE | J461 | |||
| SAE | J463 | |||
| Bolts | ASTM | F468 | ||
| Condenser & Heat Exchanger Tube with Integral Fins | Welded | ASTM | B956/B956M | |
| Electrode | Welding | AWS | A5.6 | |
| Welding | MILITARY | MIL-E-22200/4 | ||
| Forgings | ||||
| Nuts | ASTM | F467 | ||
| Pipe | Seamless | ASME | SB466 | |
| Seamless | ASTM | B466/B466M | ||
| Welded | ASTM | B467 | ||
| Plate | Condenser Tube | ASME | SB171 | |
| ASTM | B122/B122M | |||
| Condenser Tube | ASTM | B171/B171M | ||
| Clad | ASTM | B432 | ||
| MILITARY | MIL-C-15726 | |||
| Condenser Tube | SAE | J461 | ||
| SAE | J461 | |||
| SAE | J463 | |||
| Condenser Tube | SAE | J463 | ||
| Rod | ASTM | B151/B151M | ||
| MILITARY | MIL-C-15726 | |||
| Screws | ASTM | F468 | ||
| Sheet | ASTM | B122/B122M | ||
| MILITARY | MIL-C-15726 | |||
| SAE | J461 | |||
| SAE | J463 | |||
| Strip | ASTM | B122/B122M | ||
| MILITARY | MIL-C-15726 | |||
| SAE | J461 | |||
| SAE | J463 | |||
| Studs | ASTM | F468 | ||
| Tube | Welded | |||
| Condenser Tube | ASME | SB111 | ||
| Finned | ASME | SB359 | ||
| U-Bend | ASME | SB395 | ||
| Seamless | ASME | SB466 | ||
| Welded | ASME | SB543 | ||
| Condenser Tube | ASTM | B111/B111M | ||
| Finned | ASTM | B359/B359M | ||
| U-Bend | ASTM | B395/B395M | ||
| Seamless | ASTM | B466/B466M | ||
| Welded | ASTM | B543/B543M | ||
| Condenser Tube | ASTM | B552 | ||
| Condenser Tube | MILITARY | MIL-T-15005 | ||
| Seamless | MILITARY | MIL-T-16420 | ||
| Finned | MILITARY | MIL-T-22214 | ||
| Condenser Tube | SAE | J461 | ||
| Condenser Tube | SAE | J463 | ||
| Wire | MILITARY | MIL-C-15726 |
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