Flat, Shaped and Round Wire 

Applications 

Electrical switch springs, Fuse clips, Electrical connectors, Lock washers, Bearing plates, Gears, Thrust washers, Springs 

Description 

Phosphor bronzes are 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. Phosphor Bronzes have superb spring qualities, high fatigue resistance, excellent formability and solderability, and high corrosion resistance. They are primarily used for electrical products, other uses include corrosion resistant bellows, diaphragms, and spring washers. Leaded phosphor bronzes combine good strength and fatigue resistance with good machinability, high wear resistance and corrosion resistance. 

Chemistry Typical 

 UNS#     COPPER       TIN        LEAD        IRON         ZINC       PHOSPHORUS

C51000   Balance    4.2-5.8   0.05 max   0.10 max   0.30 max    0.03-0.35

C51100   Balance    3.5-4.9   0.05 max   0.10 max   0.30 max    0.03-0.35

C52100   Balance    7.0-9.0   0.05 max   0.10 max   0.20 max    0.03-0.35

C54400   Balance    3.5-4.5   3.0-4.0      0.10 max   1.5-4.5       0.01-0.35

* Contact Ulbrich Wire for request regarding the availability of other copper alloys.
* Contact Ulbrich Technical Department for limits for additional trace elements and impurity levels.
* Copper plus sum of named elements 99. 7% min.
* C54400 with the lead content of 3-4% can be considered as a machining grade.

Physical Properties 


Typical Density: 0.318 - 0.321 lb/in3, 8.80 - 8.88 g/cm3 

Electrical Conductivity: (% IACS at 68°F 20°C, annealed): 13 - 20% 

Thermal Conductivity: BTU-in/hr-ft2-°F 
At 68°F: 36 - 50 

Mean Coefficient of Thermal Expansion: µin/in-°F 
68 - 572 °F: 9.6 - 10.1 

Modulus of Elasticity: KSI 
16 x 103 in tension 

Forms 

Profile, Round, Flat, Square 

Mechanical Properties at Room Temperature 

Properties: Annealed Typical 

Ultimate Tensile Strength: 45 KSI min (448 MPa min)
Yield Strength: 22 KSI min (151 MPa min)
Elongation: 45% min 

Properties: Tempered

Phosphor Bronze alloys can be cold worked to various tempers. 

*Actual physical and mechanical properties are alloy dependent. Contact Ulbrich Technical Service for alloy specific properties.

Additional Properties

Corrosion Resistance

Contact Ulbrich Wire for specific information. 

Wire Finishes

XC - Extra clean. Annealed or annealed and cold rolled. Contact Ulbrich Wire with special finish requests. 

Heat Treatment

Phosphor Bronze alloys are not hardenable by heat treatment. 

Welding

Contact Ulbrich Wire for specific information. 



Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels & Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the 'applications' noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.

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