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Copper Alloy No. C91700

Nickel Gear Bronze

Chemical Composition % by weight

Element Nominal Minimum Maximum
Aluminum - - .005
Antimony - - .20
Copper 86.5 84 87
Iron - - .15
Lead - - .25
Nickel 1.5 1.2 2
Phosphorus - - .30
Silicon - - .005
Sulfur - - .05
Tin 12 11.3 12.5
Zinc - - .25

Applications

Gears

Mechanical Properties

M02 - As Centrifugal Cast

Hardness* Brinell Hardness (500 kg load) 106
Tensile Strength** KSI 60
Yield Strength ** KSI (0.5% Ext. under load) 32
Elongation** % in 2 inch 16

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

Physical Properties

Thermal Conductivity BTU/ (sq ft-ft-hr-F) 40.8
Specific Heat BTU/lb/F @ 68F .09
Thermal Expansion Per F from 68 F to 392 F .0000100
Density lb/cu in @ 68 F .316
Electrical Conductivity % IACS @ 68 F 10
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 No
Machinability rating (Free Cutting Brass=100) 20
Suitability for being joined by: Soldering/Excellent
Brazing/Good*
Oxyacetylene Welding/Fair
Gas Shielded Arc Welding/Fair
Coated Metal Arc Welding/Fair

*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.