+ + C864 Manganese Bronze
C864 Manganese Bronze

Copper Alloy No. C86400

Leaded Manganese Bronze , Leaded High Strength Yellow Brass

 UNS CDA 864

Chemical Composition % by weight

Element Nominal Minimum Maximum
Copper  59 56 62
Tin 1 .5 1.5
Lead 1 .5 1.5
Zinc 38 34 42
Iron 1.2 .40 2
Nickel (incl Co) - - 1
Aluminum 1 .5 1.5
Manganese .80 .10 1.5

Applications

Free machine components, lever arms, light duty  gears, marine fittings, valve stems.

Mechanical Properties

M02 - As Centrifugal Cast

Hardness* Brinell Hardness (3000 kg load) 105
Tensile Strength** KSI 60 min
Yield Strength ** KSI (0.5% Ext. under load) 20 min
Elongation** % in 2 inch 15 min

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

Physical Properties

Thermal Conductivity BTU/ (sq ft-ft-hr-F) 51
Specific Heat BTU/lb/ºF @ 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 19
Modulus of Elasticity KSI 14,000

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) 65
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.