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Copper Alloy No. C90300

Tin Bronze Alloy D5 , Navy G , CDA 903 , SAE 620

ASTM B 505 , ASTM B 271 , QQ-C-390 B Alloy Type 2 & 3

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 8 7.5 9
Zinc 4 3 5

Applications

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

Mechanical Properties

M07 - As Continuous Cast

Hardness Brinell Hardness (500 kg load) 70
Tensile Strength** KSI 45
Yield Strength ** KSI (0.5% Ext. under load) 21
Elongation** % in 2 inch 30

**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 340 F .000010
Density lb/cu in @ 68 F .318
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) 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.