Copper Alloy No. C90500

Tin Bronze, Gun Metal SAE 62 , CDA 905 , 88-10-0-2

ASTM B 505 , ASTM B 271

Chemical Composition % by weight

 

Element Nominal Minimum Maximum
Aluminum - - .005
Antimony - - .20
Copper 88 86 89
Iron - - .20
Lead - - .30
Nickel - - 1
Phosphorus - - .05
Silicon - - .005
Sulfur - - .05
Tin 10 9 11
Zinc 2 1 3

 

Applications

Bearings, bushings, pump impellers, piston rings, valve components, steam fittings, gears.

Mechanical Properties

M07 - As Continuous Cast

Hardness Brinell Hardness (500 kg load) 75
Tensile Strength** KSI 45
Yield Strength ** KSI (0.5% Ext. under load) 22
Elongation** % in 2 inch 25

**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/F @ 68F .09
Thermal Expansion Per F from 68 F to 572 F .000011
Density lb/cu in @ 68 F .315
Electrical Conductivity* (Annealed) % IACS @ 68 F 11
Modulus of Elasticity KSI 15,000

*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) 30
Suitability for being joined by: Soldering/Excellent
  Brazing/Good*
  Oxyacetylene Welding/Fair
  Gas Shielded Arc Welding/Fair
  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.