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              C90700 Tin Bronze

C90700 Tin Bronze   Copper Alloy No. C90700   C90700 Tin Bronze

Tin Bronze Alloy , SAE 65 , CDA 907

ASTM B 505
Chemical Composition % by weight
Element Nominal Minimum Maximum
Aluminum - - .005
Antimony - - .20
Copper 89 88 90
Iron - - .15
Lead 7 6 .50
Nickel - - .50
Phosphorus - - .30
Silicon - - .005
Sulfur - - .05
Tin 11 10 12
Zinc - - .50
Applications
Gears, bearings, bushings.
Mechanical Properties
Typical for 3" dia. continuous cast bar
Hardness* Brinell Hardness (500 kg load) 105
Tensile Strength** KSI 42
Yield Strength ** KSI (0.5% Ext. under load) 25
Elongation** % in 2 inch 10
**Test values are nominal approximations and depend on specimen size and orientation.
Physical Properties
Thermal Conductivity BTU/ (sq ft-ft-hr-F) 40.8
Specific Heat BTU/lb/ºF @ 68F .09
Thermal Expansion Per °F from 68 F to 572 F .0000102
Density lb/cu in @ 68 F .317
Electrical Conductivity* (Annealed) % IACS @ 68 F 9.6
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) 20
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.

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C90700 Tin Bronze

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C90700 Tin Bronze


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