UNS C70600 - Copper Nickel Alloy

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
     Machinability
     Welding
     Hot Working
     Cold Working
     Annealing
Applications

Introduction

Copper-nickel alloys have excellent resistance to biofouling and marine corrosion, and possess good fabricability. Copper gains more strength and corrosion resistance when nickel is added to it.

UNS C70600 is one type of copper-nickel alloys, which has excellent corrosion resistance even in marine environments. This alloy possesses average high strength and good creep resistance at high temperatures, and costs more in comparison to copper-aluminum alloys and other alloys with similar mechanical properties.

The following datasheet will provide more details about UNS C70600 copper nickel alloy.

Chemical Composition

The following table shows the chemical composition of UNS C70600 copper nickel alloy.

Element Content (%)
Cu 88.7
Fe 13
Ni 10

Physical Properties

The physical properties of UNS C70600 copper nickel alloy are outlined in the following table.

Properties Metric Imperial
Density 8.94 g/cm3 0.323 lb/in³

Mechanical Properties

The mechanical properties of UNS C70600 copper nickel alloy are tabulated below.

Properties Metric Imperial
Tensile strength 303-414 MPa 43900-60000 psi
Yield strength (depending on temper) 110-393 MPa 16000-57000 psi
Elongation at break (in 254 mm) 42% 42%
Elastic modulus 117 GPa 17000 ksi
Poisson’s ratio 0.34 0.34
Machinability (UNS C36000 (free-cutting brass) = 100) 20 20
Shear modulus 52.0 GPa 7540 ksi

Thermal Properties

The thermal properties of UNS C70600 copper nickel alloy are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@20-300°C/68-572°F) 17.1 µm/m°C 9.50 µin/in°F
Thermal conductivity (@20°C/ 68°F ) 40 W/mK 278 BTU in/hr.ft².°F

Other Designations

Equivalent materials to UNS C70600 copper nickel alloy are:

ASME SB111 ASME SB171 ASME SB359 ASME SB395
ASME SB466 ASME SB467 ASME SB543 ASTM B111
ASTM B151 ASTM B122 ASTM B171 ASTM B359
ASTM B395 ASTM B432 ASTM B466 ASTM B469
ASTM B543 ASTM B608 DIN 2.0872 MIL C-15726
MIL T-15005 MIL T-16420 MIL T-22214 SAE J461
SAE J463

Fabrication and Heat Treatment

Machinability

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The machinability rate of UNS C70600 copper 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 for UNS C70600 alloy.

Hot Working

The hot working capacity of UNS C70600 copper nickel alloy is good with the recommended hot working temperature ranging between 760 and 816°C (1550 and 1750°F).

Cold Working

The cold working capacity of UNS C70600 is good.

Annealing

The annealing temperature of UNS C70600 copper nickel alloy is between 593 and 816°C (1100 and 1500°F).

Applications

UNS C70600 copper nickel alloy is primarily used for seawater service as forged and machined valve and pump components, fittings and hardware. This alloy is also used in applications requiring high corrosion resistance and where chloride stress-corrosion cracking precaution prevents usage of stainless steels.

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