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Copper Alloy No. C86500

Manganese Bronze , High Strength Yellow Brass CDA 865

Chemical Composition % by weight

Element Nominal Minimum Maximum
Copper 58 55 60
Tin .7 .5 1
Lead - - .40
Zinc 39 36 42
Iron 1.2 .4 2
Nickel (incl Co) - - 1
Aluminum 1 .50 1.5
Manganese .8 .10 1.5

Applications

Brackets, gears, lever arms, machinery parts requiring strength and toughness, salt and fresh water propellers, valve stems.

Mechanical Properties

M07 - As Continuous Cast

Hardness* Brinell Hardness (3000 kg load) 130
Tensile Strength** KSI 70 min
Yield Strength ** KSI (0.5% Ext. under load) 25 min
Elongation** % in 2 inch 25 min

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

Physical Properties

Thermal Conductivity BTU/ (sq ft-ft-hr-F) 49.6
Specific Heat BTU/lb/F @ 68F .09
Thermal Expansion Per F from 68 F to 400 F .000011
Density lb/cu in @ 68 F .301
Electrical Conductivity % IACS @ 68 F 22
Modulus of Elasticity KSI 15,000

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) 26
Suitability for being joined by: Soldering/Fair
Brazing/Fair*
Oxyacetylene Welding/Poor
Gas Shielded Arc Welding/Poor
Coated Metal Arc Welding/Poor

*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.