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Alloy 903 Tin Bronze

Sequoia Brass & Copper sells alloy 903 tin bronze. 903 Tin bronze has a low lead content making it suitable for environmentally friendly requirements. 903 tin bronze has high wear resistance and low friction resistance characteristics which makes them ideal for fittings with pressure tightness is needed. This product comes in sand cast rod and sand cast tube forms and is cut to order from your specifications. Typical uses of 903 tin bronze are for building heavy construction equipment, swivel fasteners, industrial parts, and plumbing steam fittings. It is often used in castings for liquid and gas, not to mention valves and pumps.

  • Chemical Composition
  • Fabrication Properties
  • Casting Characteristics
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  Cu Al Sb Fe Pb Ni P Si S Sn Zn
Min/Max 86.0 - 89.0 0.005 0.2 0.2 0.3 1 0.05 0.005 0.05 7.5 - 9.0 3.0 - 5.0
Nominal 87.5 8.3 4
Joining Technique Suitability
Soldering Excellent
Brazing Good
Oxyacetylene Welding Fair
Gas Shielded Arc Welding Fair
Coated Metal Arc Welding Fair
Spot Weld N/A
Seam Weld N/A
Butt Weld N/A
Capacity for Being Cold Worked N/A
Capacity for Being Hot Formed N/A
Machinability Rating: 30
Product Forms
Sand Cast Rod
Sand Cast Tube
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Common Fabrication Processes For 903 Tin Bronze


Typical Uses

Heavy construction equipment
Pump impellers, piston rings, valve bodies, valves, gears, bushings, bearings, pump bodies, gear blanks
Steam fittings