Gilding Copper, UNS C21000, Extra Hard Temper

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Gilding Copper, UNS C21000, Extra Hard Temper
Categories:	Metal; Nonferrous Metal; Copper Alloy
Material Notes:	Good to excellent corrosion resistance. Excellent cold workability, good hot workability for blanking, coining, drawing, piercing and punching, shearing, spinning, squeezing and swaging, stamping. Applications: coins, medals, tokens, bullet jackets, firing pin supports, fuse caps, primers, emblems, plaques, base for gold plate. Available as flat products and wire.
Key Words:	CZ125, ISO CuZn5, CEN CW500L, Cap copper, 95/5 brass
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Physical Properties	Metric	English	Comments

Density	8.86 g/cc	0.320 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell B	70	70
Hardness, Rockwell 30T	64	64
Tensile Strength, Ultimate	420 MPa	60900 psi
Tensile Strength, Yield	380 MPa	55100 psi
Elongation at Break	4.0 %	4.0 %	In 50 mm
Modulus of Elasticity	115 GPa	16700 ksi
Poissons Ratio	0.307	0.307
Machinability	20 %	20 %	UNS C36000 (free-cutting brass) = 100%
Shear Modulus	44.0 GPa	6380 ksi
Shear Strength	270 MPa	39200 psi

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.00000244 ohm-cm @Temperature 1100 °C	0.00000244 ohm-cm @Temperature 2010 °F	liquid phase
	0.00000310 ohm-cm @Temperature 20.0 °C	0.00000310 ohm-cm @Temperature 68.0 °F	annealed
Magnetic Susceptibility	-0.0000125 - -1.00e-6	-0.0000125 - -1.00e-6	SI units

Thermal Properties	Metric	English	Comments
CTE, linear	18.0 µm/m-°C @Temperature 20.0 - 300 °C	10.0 µin/in-°F @Temperature 68.0 - 572 °F
Specific Heat Capacity	0.380 J/g-°C	0.0908 BTU/lb-°F
Thermal Conductivity	234 W/m-K @Temperature 20.0 °C	1620 BTU-in/hr-ft²-°F @Temperature 68.0 °F
Melting Point	1050 - 1065 °C	1920 - 1949 °F
Solidus	1050 °C	1920 °F
Liquidus	1065 °C	1949 °F

Processing Properties	Metric	English	Comments
Annealing Temperature	425 - 800 °C	797 - 1470 °F
Hot-Working Temperature	750 - 875 °C	1380 - 1610 °F

Component Elements Properties	Metric	English	Comments
Copper, Cu	94 - 96 %	94 - 96 %
Iron, Fe	<= 0.050 %	<= 0.050 %
Lead, Pb	<= 0.050 %	<= 0.050 %
Zinc, Zn	5.0 %	5.0 %

Descriptive Properties
Velocity of Sound	3.78 km/s		at 20°C

References for this datasheet.

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MC21000b8 / 10985

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