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Copper Alloy No. C86300

High Tensile Manganese Bronze , SAE 430B , CDA 863

Chemical Composition % by weight

Element Nominal Minimum Maximum
Aluminum 6 5 7.5
Copper 63 60 66
Iron 3 2 4
Lead - - .20
Manganese 3 2.5 5
Nickel - - 1
Tin - - .20
Zinc 25 22 28

Applications

Extra heavy duty high strength alloy for large valve stems, gears, cams, slow speed heavy load bearings, screw down nuts, hydraulic cylinder parts

Mechanical Properties

M07 - As Continuous Cast

Hardness* Brinell Hardness (3000 kg load) 225
Tensile Strength** KSI 110 min
Yield Strength ** KSI (0.5% Ext. under load) 62 min
Elongation** % in 2 inch 14

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

Physical Properties

Thermal Conductivity BTU/ (sq ft-ft-hr-F) 20.5
Specific Heat BTU/lb/F @ 68F .09
Thermal Expansion Per F from 68 F to 500 F .000012
Density lb/cu in @ 68 F .283
Electrical Conductivity* (Annealed) % IACS @ 68 F 8
Modulus of Elasticity KSI 14,200

*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/Poor
Brazing/Poor
Oxyacetylene Welding/Poor
Gas Shielded Arc Welding/Poor
Coated Metal Arc Welding/Good

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.