+ + C92300 Leaded Tin Bronze
C92300 Leaded Tin Bronze

Copper Alloy No. C92300

Leaded Tin Bronze , CDA 923 Leaded G Bronze , 87-8-1-4

ASTM B 505 , ASTM B 271

Chemical Composition % by weight

Element Nominal Minimum Maximum
Aluminum - - .005
Antimony - - .25
Copper 87 85 89
Iron - - .25
Lead .65 .3 1
Nickel - - 1
Phosphorus - - .05
Silicon - - .005
Sulfur - - .05
Tin 8 7.5 9
Zinc 4 2.5 5

Applications

Valves, pipe fittings and high pressure steam castings.

Mechanical Properties

M07 - As Continuous Cast

Hardness* Brinell Hardness (500 kg load) 70
Tensile Strength** KSI 40 min
Yield Strength ** KSI (0.5% Ext. under load) 19 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) 43.2
Specific Heat BTU/lb/ºF @ 68F .09
Thermal Expansion Per °F from 68 F to 350 F .000010
Density lb/cu in @ 68 F .317
Electrical Conductivity* (Annealed) % IACS @ 68 F 12
Modulus of Elasticity KSI 14,000

*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) 42
Suitability for being joined by: Soldering/Excellent
  Brazing/Good*
  Oxyacetylene Welding/Not Recommended
  Gas Shielded Arc Welding/Not Recommended
  Coated Metal Arc Welding/Not Recommended

*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.