Fire-refined Tough Pitch Copper with Silver, UNS C12900, OSO25 Temper flat products

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Fire-refined Tough Pitch Copper with Silver, UNS C12900, OSO25 Temper flat products
Categories:	Metal; Nonferrous Metal; Copper Alloy
Material Notes:	Good to excellent corrosion resistance. Excellent hot and cold workability; good forgeability. Fabricated by coining, coppersmithing, drawing and upsetting, hot forging and pressing, spinning, swaging, stamping. Applications: busbars, bus conductors, waveguides, hollow conductors, lead-in wires and anodes for vacuum tubes, vacuum seals, transistor components, glass to metal seals, coaxial cables and tubes, klystrons, microwave tubes, and rectifiers. Test specimens: flat products - 1mm thickness. UNS C12500, C12700, C12800, C12900, and C13000 are similar alloys having very similar mechanical properties; they are distinguished by differences in silver content.
Key Words:	Fire-Refined Copper, FRTSP. MIL-W-3318
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Physical Properties	Original Value	Comments

Density	8.89 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Rockwell F	45
Tensile Strength, Ultimate	235 MPa
Tensile Strength, Yield	76.0 MPa @Strain 0.5 %
Elongation at Break	45 %	In 50 mm
Modulus of Elasticity	115 GPa	Estimated from similar Cu Alloys
Poissons Ratio	0.31	Calculated
Machinability	20 %	UNS C36000 (free-cutting brass) = 100%
Shear Modulus	44.0 GPa	Estimated from similar Cu Alloys
Shear Strength	160 MPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.00000176 ohm-cm @Temperature 20.0 °C

Thermal Properties	Original Value	Comments
CTE, linear	16.8 µm/m-°C @Temperature 20.0 - 100 °C
	17.4 µm/m-°C @Temperature 20.0 - 200 °C
	17.7 µm/m-°C @Temperature 20.0 - 300 °C
Specific Heat Capacity	0.385 J/g-°C
Thermal Conductivity	377 W/m-K @Temperature 20.0 °C
Melting Point	<= 1085 °C
Liquidus	1085 °C
Annealing Point	750 - 1200 °F

Processing Properties	Original Value	Comments
Annealing Temperature	400 - 650 °C
Hot-Working Temperature	750 - 950 °C

Component Elements Properties	Original Value	Comments
Antimony, Sb	<= 0.0030 %
Arsenic, As	<= 0.012 %
Bismuth, Bi	<= 0.0030 %
Copper, Cu	>= 99.88 %	Includes Ag
Lead, Pb	<= 0.0040 %
Nickel, Ni	<= 0.050 %
Selenium, Se	<= 0.025 %	includes Te
Silver, Ag	>= 0.055 %	Min 16 troy oz./ton (may be specified)

References for this datasheet.

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MC12900b1 / 148795

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