Nickel Silver Copper Alloy, UNS C78270, H03 Temper, Flat Products

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Nickel Silver Copper Alloy, UNS C78270, H03 Temper, Flat Products
Categories:	Metal; Nonferrous Metal; Copper Alloy
Material Notes:	Temper: 3/4 Hard Fabrication Properties: Excellent Suitability – Soldering; Good Suitability – Brazing, Capacity for Being Cold Worked; Fair Suitability – Butt Weld; Poor Suitability – Capacity for Being Hot Formed Typical uses: Watch Parts, Watch Plates; Key Blanks
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Physical Properties	Metric	English	Comments

Density	8.58 g/cc	0.310 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell B	84 @Thickness 1.02 mm	84 @Thickness 0.0400 in
Hardness, Rockwell 30T	72 @Thickness 1.02 mm	72 @Thickness 0.0400 in
Tensile Strength	538 MPa @Thickness 1.02 mm	78000 psi @Thickness 0.0400 in
Tensile Strength, Yield	434 MPa @Thickness 1.02 mm	63000 psi @Thickness 0.0400 in	0.5% Ext
Elongation at Break	5.0 % @Thickness 1.02 mm	5.0 % @Thickness 0.0400 in
Tensile Modulus	117 GPa	17000 ksi
Modulus of Rigidity	44.1 GPa	6400 ksi
Poissons Ratio	0.33	0.33	Calculated
Machinability	60 %	60 %
Shear Strength	352 MPa @Thickness 1.02 mm	51000 psi @Thickness 0.0400 in

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000172 ohm-cm	0.0000172 ohm-cm	10% IACS

Thermal Properties	Metric	English	Comments
CTE, linear	18.5 µm/m-°C @Temperature 20.0 - 100 °C	10.3 µin/in-°F @Temperature 68.0 - 212 °F
Thermal Conductivity	4.03 W/m-K	28.0 BTU-in/hr-ft²-°F
Melting Point	971 - 999 °C	1780 - 1830 °F
Solidus	971 °C	1780 °F
Liquidus	999 °C	1830 °F

Component Elements Properties	Metric	English	Comments
Copper, Cu	65 - 68 %	65 - 68 %
Iron, Fe	<= 0.35 %	<= 0.35 %
Lead, Pb	1.0 - 1.8 %	1.0 - 1.8 %
Manganese, Mn	<= 0.50 %	<= 0.50 %
Nickel, Ni	4.5 - 6.0 %	4.5 - 6.0 %
Zinc, Zn	23.7 - 29.5 %	23.7 - 29.5 %	As Balance

References for this datasheet.

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MC78270x3 / 292512

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