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
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.
Thermal Conductivity BTU/ (sq ft-ft-hr-F) 40.8 Specific Heat BTU/lb/ºF @ 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
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.