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Copper Alloy

C510 Phosphor Bronze

C510 phosphor bronze is a tin bronze with a phosphorus deoxidizer that delivers high strength near 470 MPa, excellent fatigue and spring properties, and good wear resistance. With 85 HRB hardness and 4/5 corrosion resistance, it bridges the gap between plain brass and the much pricier beryllium copper for springs and bearings.

How C510 Phosphor Bronze machines

Rated 3/5, typical of tin bronzes. It is tougher and gummier to cut than free-machining brass, so it benefits from sharp tooling and steady feeds. The payoff is its mechanical behavior: it work-hardens to high spring temper, which is why it is sold heavily as strip and wire.

Manufacturing & processing

Supplied for sheet metal forming, extrusion, and CNC. Springs and contacts are stamped and formed from cold-rolled strip, gaining strength from cold work rather than heat treatment. It solders and brazes readily and resists dezincification because it contains no zinc.

Typical applications

Used for electrical contact springs, connectors, fuse clips, and switch parts that flex repeatedly, plus bushings, bearings, and thrust washers where its wear resistance and low friction shine. Marine and chemical hardware exploit its corrosion resistance and freedom from dezincification.

When to choose it

Choose C510 when you need strong, fatigue-resistant springs or bearings but C172 beryllium copper's cost or beryllium handling is unjustified. Pick it over brass when fatigue life and wear matter more than machining speed. If you need top conductivity, a copper like C145 serves better.

Suitable surface finishes

Common finishes for C510 Phosphor Bronze: nickel plating, chrome plating, electropolishing, brushed. Use the finish selector →

FAQ

How does C510 compare to beryllium copper for springs?
C510 offers excellent fatigue and spring properties at far lower cost and with no beryllium dust hazard, but tops out near 470 MPa tensile. C172 reaches about 1300 MPa. Use C510 for the majority of contact and connector springs; reserve C172 for the highest-stress, smallest, or conductivity-critical springs.
Why add phosphorus to bronze?
Phosphorus deoxidizes the melt and forms a hard phosphide phase that improves wear resistance and stiffness. It also raises strength and elasticity, making the alloy excellent for springs and bearings. The result is a tin bronze that holds spring temper and resists fatigue better than plain copper-tin alloys.
Does C510 resist seawater?
It has good general corrosion resistance, rated 4/5, and contains no zinc so it is immune to dezincification. For demanding marine load-bearing parts such as propellers or pump components, C630 nickel-aluminum bronze is the stronger, more erosion-resistant choice; C510 suits contacts and lighter marine hardware.

Property values are typical/nominal for early guidance and vary by temper, grade, supplier and heat treatment. Confirm critical specs against a certified datasheet or with an mfgiq engineer.