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C90300
CAST C90300
Tin bronze alloys, such as C903, are typically found in gear, high-strength bushing and bearing applications where high strength and low speeds and heavy loads are present. Other high-strength applications for these alloys are pump impellers, piston rings, steam fittings and valve bodies. C90300 tin bronze castings are utilized in movable bridge components, turntables for bridges and other structures for fixed and expansion bearings with slow or intermittent movement with heavy loads.
INFORMATION
PRODUCT DESCRIPTION: Tin Bronze
SOLIDS: 1/2” to 10” O.D.
TUBES: 1” to 16” O.D.
RECTANGLES: Up to 20”
STANDARD LENGTHS: 144”
SHAPE/FORM: semi-finished, mill stock or near-net shapes, anode, bar stock, billet/bloom, squares, hex, plate, profile or structural shape, flats/rectangular bar
TYPICAL USES
BUILDING: heavy construction equipment
FASTENERS: swivel
INDUSTRIAL: bearings, bushings, gear blanks, gears, piston rings, pump bodies, pump impellers, valve bodies, valves
PLUMBING: steam fittings
CHEMICAL COMPOSITION
Cu%1
Pb%
Sn%
Zn%
Fe%
P%1,2
Ni%
Al%
S%
Sb%
Si%
86.00-89.00
0.30
7.50-9.00
3.00-5.00
0.20
0.05
1.00
0.005
0.05
0.20
0.005
MACHINABILITY
Copper Alloy UNS No.
Machinability Rating
Density(lb / in 3 at 68 °F)
C90300
30
0.318
MECHANICAL PROPERTIES
Tensile Strength, min
Yield Strength, at 0.5% Extension Under Load, min
Elongation, in 2 in. or 50 mm min
Brinell Hardness (500 kg load)
Remarks
ksi
MPa
ksi
MPa
%
typical BHN
33
303
22
152
18
70
PHYSICAL PROPERTIES
US Customary
Metric
Melting Point - Liquidus
1832 °F
1000 °C
Melting Point - Solidus
1570 °F
854 °C
Density
0.318 lb/in3 at 68 °F
8.80 gm/cm3 at 20 °C
Specific Gravity
8.8
8.8
Electrical Conductivity
12% IACS at 68 °F
0.069 MegaSiemens/cm at 20 °C
Thermal Conductivity
43.2 Btu/sq ft/ft hr/°F at 68 °F
74.8 W/m at 20 °C
Coefficient of Thermal Expansion 68-392

10 · 10-6 per °F (68-392 °F)

17.3 · 10-6 per °C (20-200 °C)

Specific Heat Capacity
0.09 Btu/lb/°F at 68 °F
377.1 J/kg at 20 °C
Modulus of Elastic in Tension
14000 ksi
96527 MPa
Magnetic Permeability
1
1
FABRICATION PROPERTIES
Technique
Suitability
Soldering
Excellent
Brazing*
Good
Oxyacetylene Welding
Fair
Gas Shielded Arc Welding
Fair
Coated Metal Arc Welding
Fair
Machinability Rating
30
THERMAL PROPERTIES
Treatment
Value*
Time**
Stress Relief
500
Solution Treatment
0


SPEC SHEET


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