Tin-Bearing Copper Nickel, UNS C72500, Super Spring flat products

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Tin-Bearing Copper Nickel, UNS C72500, Super Spring flat products
Categories:	Metal; Nonferrous Metal; Copper Alloy
Material Notes:	Excellent corrosion resistance. Excellent hot and cold formability. Fabricated by blanking, brazing, coining, drawing, etching, forming and bending, heading and upsetting, roll threading and knurling, shearing, spinning, squeezing, stamping and swaging. Applications: relay and switch springs, connectors, brazing alloy, lead frames, control and sensing bellows. Test specimen: flat products - 1mm thickness.
Key Words:	Cupronickel with Tin
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Physical Properties	Metric	English	Comments

Density	8.89 g/cc	0.321 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell B	99	99
Tensile Strength, Ultimate	770 MPa	112000 psi
Tensile Strength, Yield	570 MPa @Strain 0.5 %	82700 psi @Strain 0.5 %
	740 MPa @Strain 0.2 %	107000 psi @Strain 0.2 %
Elongation at Break	1.0 %	1.0 %	In 50 mm
Modulus of Elasticity	137 GPa	19900 ksi
Poissons Ratio	0.32	0.32	Calculated
Machinability	20 %	20 %	UNS C36000 (free-cutting brass) = 100%
Shear Modulus	52.0 GPa	7540 ksi

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000157 ohm-cm	0.0000157 ohm-cm

Thermal Properties	Metric	English	Comments
CTE, linear	16.5 µm/m-°C @Temperature 20.0 - 300 °C	9.17 µin/in-°F @Temperature 68.0 - 572 °F
Specific Heat Capacity	0.377 J/g-°C	0.0900 BTU/lb-°F
Thermal Conductivity	55.0 W/m-K @Temperature 20.0 °C	382 BTU-in/hr-ft²-°F @Temperature 68.0 °F
Melting Point	1060 - 1130 °C	1940 - 2070 °F
Solidus	1060 °C	1940 °F
Liquidus	1130 °C	2070 °F
Annealing Point	649 - 801.7 °C	1200 - 1475 °F

Processing Properties	Metric	English	Comments
Annealing Temperature	650 - 800 °C	1200 - 1470 °F
Hot-Working Temperature	850 - 950 °C	1560 - 1740 °F

Component Elements Properties	Metric	English	Comments
Copper, Cu	88.2 %	88.2 %
Iron, Fe	<= 0.60 %	<= 0.60 %
Lead, Pb	<= 0.050 %	<= 0.050 %
Manganese, Mn	<= 0.20 %	<= 0.20 %
Nickel, Ni	8.5 - 10.5 %	8.5 - 10.5 %
Other, total	<= 0.20 %	<= 0.20 %
Tin, Sn	1.8 - 2.8 %	1.8 - 2.8 %
Zinc, Zn	<= 0.50 %	<= 0.50 %

References for this datasheet.

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MC72500b8 / 11769

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