C72900 Copper Nickel Tin

ASTM B249, ASTM B740, ASTM B929, AMS-4596B,UNS C72900

Oxyacetylene Welding

WINDO METAL maintains an extensive inventory of Materion spinodal alloy ToughMet 3 Copper Nickel Tin C729. Copper alloy 729 is an excellent alternative to nickel alloys, aluminum bronzes, and beryllium copper. C729 ToughMet alloys are anti-galling, free of lead and beryllium, and show excellent corrosion and stress corrosion cracking resistance in seawater applications. ToughMet (C72900) has exceptional high strength, excellent machinability, and is non-magnetic.

C72900 Nickel Bronze Sizing
Round Bar (3/8” dia to 9-1/4”)
Hollow Bar (Upon Request)
Sheet (Upon Request)

C72900 Toughmet Copper Nickel Tin Applications
Drilling and mining equipment
Aircraft bearings and bushings
Pump parts
Thrust washers

 C72900 Copper Nickel Tin

C72900 Copper Nickel Tin

WINDO METAL extends its services throughout many industries. We provide the raw copper alloy materials in various standard shapes as well as custom cut copper alloys.
Oil & Gas

Physical Properties
Melting Point – Liquidus°F 2039
Melting Point – Solidus°F 1742
Densitylb/cu in. at 68°F 0.323
Specific Gravity 8.94
Electrical Conductivity% IACS at 68°F 7.8(1)
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F 17
Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) 9.1
Specific Heat CapacityBtu/ lb /°F at 68°F 0.09
Modulus of Elasticity in Tensionksi 18500
Modulus of Rigidityksi 7500
(1) Aged condition

Fabrication Properties
Alloy Joining Technique Suitability Level
C10100 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 Excellent
Capacity for Being Hot Formed Excellent
Capacity for Being Cold Worked Excellent
Capacity for Being Hot Formed Good

Chemical Properties

Element Cu (1,2) Pb(3) Sn Zn Fe Ni(4) Mg Mn Nb
Min % 7.5 14.5
Max (%) Rem 0.02 8.5 0.50 0.50 15.5 0.15 0.30 0.10
(1) Cu + Sum of Named Elements 99.7% min. (2) Cu value includes Ag. (3) 0.005% Pb max. for hot rolling. (4) Ni value includes Co.

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