Brass Copper Castings India
C91700 Nickel Tin Bronze


Copper Alloy No. C91700
Nickel Gear Bronze
Chemical Composition % by weight
Element Nominal Minimum Maximum
Aluminum - - .005
Antimony - - .20
Copper 86.5 84 87
Iron - - .15
Lead - - .25
Nickel 1.5 1.2 2
Phosphorus - - .30
Silicon - - .005
Sulfur - - .05
Tin 12 11.3 12.5
Zinc - - .25

Applications

Gears

Mechanical Properties

M02 - As Centrifugal Cast

Hardness* Brinell Hardness (500 kg load) 106
Tensile Strength** KSI 60
Yield Strength ** KSI (0.5% Ext. under load) 32
Elongation** % in 2 inch 16

**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 392 F .0000100
Density lb/cu in @ 68 F .316
Electrical Conductivity % IACS @ 68 F 10
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