Brass Copper Castings India
Tin Bronze Alloy C90500 Gun Metal


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/ºF @ 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