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Copper Alloy No. C92500

Leaded Tin Bronze SAE 640 , CDA 925

ASTM B 505

Chemical Composition % by weight

Element Nominal Minimum Maximum
Aluminum - - .005
Antimony - - .25
Copper 87 85 88
Iron - - .30
Lead 1 1 1.5
Nickel 1 .8 1.5
Phosphorus - - .30
Silicon - - .005
Sulfur - - .05
Tin 11 10 12
Zinc - - .50

Applications

Gears, automotive synchronizer rings.

Mechanical Properties

M07 - As Continuous Cast

Hardness* Brinell Hardness (500 kg load) 80
Tensile Strength** KSI 38 min
Yield Strength ** KSI (0.5% Ext. under load) 24 min
Elongation** % in 2 inch 10 min

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

Physical Properties

Thermal Conductivity BTU/ (sq ft-ft-hr-F) N/A
Specific Heat BTU/lb/F @ 68F .09
Thermal Expansion Per F from 68 F to 350 F N/A
Density lb/cu in @ 68 F .317
Electrical Conductivity* (Annealed) % IACS @ 68 F 12
Modulus of Elasticity KSI 16,000

*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) 30
Suitability for being joined by: Soldering/Excellent
Brazing/Good*
Oxyacetylene Welding/Not Recommended
Gas Shielded Arc Welding/Not Recommended
Coated Metal Arc Welding/Not Recommended

*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.