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Copper Alloy No. C91100

Tin Bronze

Chemical Composition % by weight


Element Nominal Minimum Maximum
Aluminum - - .005
Antimony - - .20
Copper 84 82 85
Iron - - .25
Lead - - .25
Nickel - - .50
Phosphorus - - 1
Silicon - - .005
Sulfur - - .05
Tin 16 15 17
Zinc - - .25


Piston rings, bearings, bushings, bridge plates. 

Mechanical Properties

M07 - As Continuous Cast

Hardness* Brinell Hardness (3000 kg load) 135
Tensile Strength** KSI 35
Yield Strength ** KSI (0.5% Ext. under load) 25
Elongation** % in 2 inch 2

**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/F @ 68F .09
Thermal Expansion Per F from 68 F to 392 F .0000102
Density lb/cu in @ 68 F .317
Electrical Conductivity* (Annealed) % IACS @ 68 F 8
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) 10
Suitability for being joined by: Soldering/Excellent
  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.

© 1998 Conex Metals.

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