Manufacturer of Custom Machined Parts

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%1Pb%Sn%Zn%Fe%P%1,2Ni%Al%S%Sb%Si%
86.00-89.000.307.50-9.003.00-5.000.200.051.000.0050.050.200.005

Chemical Composition according to ASTM B505/B505M-18

¹In determining Cu min., Cu may be calculated as Cu + Ni. ²Ni value includes Co.
Note: Cu + Sum of Named Elements, 99.4% min. Single values represent maximums.

Machinability

Copper Alloy UNS No.Machinability RatingDensity (lb / in³ at 68°F)
C90300300.318

Mechanical Properties

Tensile Strength, minYield Strength, at 0.5% Extension Under Load, minElongation, in 2 in. or 50 mm minBrinell Hardness (500 kg load)Remarks
ksiMPaksiMPa%typical BHN
33303221521870

Physical Properties

 US CustomaryMetric
Melting Point - Liquidus1832 °F 1000 °C
Melting Point - Solidus1570 °F 854 °C
Density0.318 lb/in³ at 68 °F 8.80 gm/cm³ at 20 °C
Specific Gravity8.88.8
Electrical Conductivity12% IACS at 68 °F 0.069 MegaSiemens/cm at 20 °C
Thermal Conductivity43.2 Btu/sq ft/ft hr/°F at 68 °F 74.8 W/m at 20 °C
Coefficient of Thermal Expansion 68-39210 · 10-6 per °F (68-392 °F)17.3 · 10-6 per °C (20-300 °C)
Specific Heat Capacity0.09 Btu/lb/°F at 68 °F377.1 J/kg at 20 °C
Modulus of Elastic in Tension14000 ksi96527 MPa
Magnetic Permeability11

Fabrication Properties

TechniqueSuitability
SolderingExcellent
Brazing*Good
Oxyacetylene WeldingFair
Gas Shielded Arc WeldingFair
Coated Metal Arc WeldingFair
Machinability Rating30

Fabrication Properties provided by CDA

*Since brazing is performed withing the hot-short range, strain must be avoided during brazing and cooling.

Thermal Properties

TreatmentValue*Time**
Stress Relief500
Solution Treatment0

Thermal Properties provided by CDA

*Temperature is measured in Fahrenheit. **For Stress Relief, Solution Treatment and Annealing - Time is measured in hours/inch of thickness. For Precipitation Heat Treatment - Time is measured in hours.

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