Copper Alloy No. C84400

Leaded Semi-Red Brass , CDA 844

Chemical Composition % by weight

 

Element Nominal Minimum Maximum
Aluminum - - .005
Antimony - - .25
Copper 81 78 82
Iron - - .40
Lead 7 6 8
Nickel - - 1
Phosphorus - - .02
Silicon - - .005
Sulfur - - .08
Tin 3 2.3 3.5
Zinc 9 7 10

 

Applications

General hardware, ornamental castings, plumbing supplies and fixtures, low pressure valves and fittings.

Mechanical Properties

M07 - As Continuous Cast

Hardness* Brinell Hardness (500 kg load) 55
Tensile Strength** KSI 30 min
Yield Strength ** KSI (0.5% Ext. under load) 15 min
Elongation** % in 2 inch 16 min

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

Physical Properties

Thermal Conductivity BTU/ (sq ft-ft-hr-F) 41.9
Specific Heat BTU/lb/F @ 68F .09
Thermal Expansion Per F from 68 F to 500 F .000010
Density lb/cu in @ 68 F .314
Electrical Conductivity % IACS @ 68 F 16.4
Modulus of Elasticity KSI 13,000

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) 90
Suitability for being joined by: Soldering/Excellent
  Brazing/Good*
  Oxyacetylene Welding/Not Recommended
  Gas Shielded Arc Welding/Not Recommended
  Coated Metal Arc Welding/Fair

*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.