C90200 Tin Bronze
Copper Alloy No. C90200
High Leaded Tin Bronze CDA 934
ASTM B 505
Chemical Composition % by weight
Element Nominal Minimum Maximum Aluminum - - .005 Antimony - - .50 Copper 84 82 85 Iron - - .15 Lead 8 7 9 Nickel - - 1 Phosphorus - - .50 Silicon - - .005 Sulfur - - .08 Tin 8 7 9 Zinc - - .8
Applications
Bearings and bushings
Mechanical Properties
M07 - As Continuous Cast
Hardness Brinell Hardness (500 kg load) 60 Tensile Strength KSI 34 min Yield Strength KSI (0.5% Ext. under load) 20 min Elongation % in 2 inch 8 min Test values are nominal approximations and depend on specimen size and orientation.
Physical Properties
Thermal Conductivity BTU/ (sq ft-ft-hr-F) 33.6 Specific Heat BTU/lb/ºF @ 68F .09 Thermal Expansion Per °F from 68 F to 392 F .000010 Density lb/cu in @ 68 F .320 Electrical Conductivity* (Annealed) % IACS @ 68 F 12 Modulus of Elasticity KSI 11,000 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) 70 Suitability for being joined by: Soldering/Good 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.