Eagle Brass 521 Phosphor Bronze 8% C, Hard

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Eagle Brass 521 Phosphor Bronze 8% C, Hard
Categories:	Metal; Nonferrous Metal; Copper Alloy; Bronze
Material Notes:	Alloy C521 is a high tin alloy of the phosphor bronze family. The additional tin relative to the more commonly used C510 results in higher mechanical properties with a modest reduction in electrical conductivity. Applications include electronic parts, springs, contacts, switch parts and fasteners. Information provided by Eagle Brass Company
Key Words:	UNS C52100, ASTM B103
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Physical Properties	Original Value	Comments

Density	0.318 lb/in³	Annealed

Mechanical Properties	Original Value	Comments
Hardness, Rockwell 30T	73 - 80	Thickness > 0.020 Inch
Tensile Strength, Ultimate	85.0 - 100 ksi
Tensile Strength, Yield	78.0 - 95.0 ksi	0.2% offset
Elongation at Break	12 - 30 %	in 2 in.
Tensile Modulus	16000 ksi

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000137 ohm-cm	Annealed

Thermal Properties	Original Value	Comments
CTE, linear	10.1 µin/in-°F @Temperature 20.0 - 300 °C
Thermal Conductivity	432 BTU-in/hr-ft²-°F

Component Elements Properties	Original Value	Comments
Copper, Cu	91.9 %
Phosphorus, P	0.10 %
Tin, Sn	8.0 %

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