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/ºF @ 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.