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C90300 High Tin Bronze

A proven alloy in a wide number of uses, C90300 (SAE 620) Tin Bronze is most often used in high load, low speed applications. The alloy is hard, strong and can be counted on to withstand wear and corrosion. C90300 can be used for welding, brazing and soldering. Final components made of this alloy require good alignment and lubrication of mated parts.

Typical Applications


Valves, Potable Water Applications, Gears, Pump Components, Bearings, Bushings, Pump Impellers, Piston Rings, Valve Components, Seal Rings, Steam Fittings, Trunnion Bearings, Wrist-Pin Bushings, Piston-Pin Bushings, Machine Tool Bushings, Roll-Mill Bearings, and Bridge Bearings


Marine Fittings


Plumbing Fixtures

Chemical Composition


Mechanical Properties

Tensile Strength, min44 ksi303 MPa
Yield Strength @ .5% ext under load min22 ksi152 MPa
Elongation in 2 in. or 50 mm min, %18
Brinell Hardness70 typical Bhn (500 kg)
Machinability Rating30%

Physical Properties

 US CustomaryMetric
Melting Point-Liquidus1832 °F
1000 °C
Melting Point-Solidus1570 °F
854 °C
Desnity0.318 lb/in 3
@ 68 °F
8.80 gm/cm 3
@ 20 °C
Specific Gravity8.818.81
Electrical ResistivityN/AN/A
Electrical Conductivity12% IACS
@ 68 °F
0.069 MegaSiemens/cm
@ 20 °C
Thermal Conductivity43.2 Btu/sq ft/ft hr/°F
@ 68 °F
74.8 W/m
@ 20 °C
Coefficient of
Thermal Expansion
10 ⋅ 10-6 per °F
(68-392 °F)
17.3 ⋅ 10-6 per °C
(20-200 °C)
Specific Heat Capacity0.09 Btu/lb/°F
68 °F 
377.1 J/kg
@293 °C
Modulus of Elasticity
in Tension
14000 ksi96527 MPa
Magnetic Permeability11

Fabrication Properties

Joining TechniqueSuitability
Oxyacetylene WeldingFair
Gas Shielded Arc WeldingFair
Coated Metal Arc WeldingFair

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