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Copper Alloy No. C94700 HT

Heat Treated Nickel Tin Bronze CDA 947 , Nicomet« Bronze

Chemical Composition % by weight


Element Nominal Minimum Maximum
Aluminum - - .005
Antimony - - .15
Copper 88 85 90
Iron - - .25
Lead - - .01
Manganese - - .20
Nickel 5 4.5 6
Phosphorus - - .05
Silicon - - .005
Sulfur - - .05
Tin 5 4.5 6
Zinc 2 1 2.5



Valve stems and bodies, bearings, wear guides, shift forks, feeding mechanisms, circuit breaker parts, gears, piston cylinders, nozzles.


Mechanical Properties


M07/TF00 As Continuous Cast, Solution and Precipitation Heat Treated

Hardness* Brinell Hardness (3000 kg load) 180
Tensile Strength** KSI 75 min
Yield Strength ** KSI (0.5% Ext. under load) 50 min
Elongation** % in 2 inch 5 min

**Test values are nominal approximations and depend on specimen size and orientation.

Physical Properties

Thermal Conductivity BTU/ (sq ft-ft-hr-F) 31.2
Specific Heat BTU/lb/║F @ 68F .09
Thermal Expansion Per ░F from 68 F to 392 F .000011
Density lb/cu in @ 68 F .320
Electrical Conductivity* (Annealed) % IACS @ 68 F 15
Modulus of Elasticity KSI 15,000

*Volume basis

Fabrication Practices

Stress relieving temperature 500 F or 260 C
Time at temperature 1 hour per inch of section thickness
Responds to heat treatment Yes
Solution heat treating temperature 1425-1475 F or 775-800 C
Time at temperature 2 hours per inch of section thickness
Quenching medium Water
Precipitation hardening temperature 580-620 F or 305-325 C
Time at temperature 5 hours
Quenching medium Air
Machinability rating (Free Cutting Brass=100) 30
Suitability for being joined by: Soldering/Excellent
  Oxyacetylene Welding/Fair
  Carbon Arc Welding/Not Recommended
  Gas Shielded Arc Welding/Good
  Coated Metal Arc Welding/Good

*Since brazing is performed at temperatures within the hot-short range, strain must be avoided during the brazing and cooling of this alloy.

The values listed above represent reasonable approximations suitable for general engineering use. Due to commercial variations in composition and to manufacturing limitations, they should not be used for specification purposes. See applicable A.S.T.M. specification references.

© 1998 Conex Metals

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