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Alloy 544 Phosphor Bronze

Sequoia Brass & Copper sells alloy 544 phosphor bronze. Phosphor Bronzes, or tin bronzes, are alloys containing copper, tin and phosphorous. The phosphor bronzes contain between 0.5 and 11% tin and 0.01 to 0.35 % phosphorous. The addition of tin increases the corrosion resistance and strength of the alloy. The phosphorous increases the wear resistance and stiffness of the alloy.

With a high machinability rating of 80, 544 phosphor bronze can be bent, formed, stamped, or blanked. It has a very high strength and toughness as well as low coefficient of friction and fine grain. 544 phosphor bronze is resistant to wear, fatigue, and chemical corrosion. It is used as electrical connectors and partially due to its excellent machinability finds use as bushings, gears, pinions, screw machine products, thrust washers, valve parts, and shafts.

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  Cu Fe Pb P Sn Zn
Min/Max Rem. 0.1 3.0 - 4.0 .01 - .50 3.5 - 4.5 1.5 - 4.5
Nominal 88 3.8 0.25 4 3
Joining Technique Suitability
Soldering Excellent
Brazing Good
Oxyacetylene Welding Not Recommended
Gas Shielded Arc Welding Not Recommended
Coated Metal Arc Welding Not Recommended
Spot Weld Not Recommended
Seam Weld Not Recommended
Butt Weld Fair
Capacity for Being Cold Worked Good
Capacity for Being Hot Formed N/A
Machinability Rating: 80
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Common Fabrication Processes For
544 Phosphor Bronze

Blanking, drawing, forming and bending, machining, shearing, stamping

Typical Uses

Electrical connectors
Bushings, gears, pinions, screw machine products, thrust washers, valve parts, sleeve bearings, thrust bearings, bearings, shafts