Cupro C

Description

This is a copper alloy with high electrical conductivity.

When alloyed with chromium and zirconium, wear resistance increases.

Wires can be shaped by erosion.

Consumer	Electrical	Industrial
Pencil-type & Light Soldering Guns: Tips, Rod Extensions	Arcing and Bridging Parts	Current Carrying Shafts and Arms
	Cable	Electrode Holder Jaws
	Circuit Breaker Parts	Flash Welding Electrodes
	Connectors	Heat Sinks
	Contacts	Molds
	Electric Motor and Generator Components	Plastic Mold Components
	Electrical Conductors Requiring Greater Strength than Copper	Resistance Welding Machine Electrodes
	Electrical Connectors	Seam Welding Wheels
	Electron Tube Grid Side Rods	Spot Welding Tips
	Parts for Electronic Devices	Structural Parts
	Semi Conductor Bases	Wear Plates on Heavy Equipment
	Switch Contacts
	Switch Gears
	Thermal Conductors Requiring Greater Strength than Copper
	Wire, High Temperature

COMMON FABRICATION PROCESSES

Bending
Cold working
Drawing
Extruding
Forging
heading
Hot working
Impacting
Rolling
Swaging

CHEMICAL COMPOSITION

Elements
Cu^(1,2)	Pb	Fe	Cr	Si
(1) Cu + Sum of Named Elements 99.5% min. (2) Cu value includes Ag.
Min (%)				0.6
Max (%)	Rem	0.05	0.10	1.2	0.10

MECHANICAL PROPERTIES

Form	Temper	Temper Code	Tensile Strength (ksi)	YS-0.5% Ext (ksi)	Elongation (%)	Rockwell B scale	Rockwell F scale	Torsion Modulus (ksi)	Section Size (in)	Cold Work (%)
* Measured at room temperature, 68°F (20°C).
Flat Products	1/4 Hard and Precipitation Heat Treated	TH01	67 Typ	59 Typ	14 Typ				0.04	50
	Precipitation Hardened	TF00	51 Typ	36 Typ	22 Typ	59 Typ			0.04
	Solution Heat Treated	TB00	34 Typ	19 Typ	40 Typ	16 Typ			0.04
	Solution Heat Treated and Cold Worked: 1/8 Hard	TD00	53 Typ	51 Typ	6 Typ	66 Typ			0.04	50
Flat Products & Rod	Precipitation Hardened	TF00	72 Typ	65 Typ	18 Typ				1
	Precipitation Hardened	TF00	55 Typ	43 Typ	25 Typ				4
	Precipitation Hardened	TF00	56 Typ	40 Typ	30 Typ				3
	Precipitation Hardened	TF00	65 Typ	55 Typ	18 Typ				3
	Precipitation Hardened	TF00	58 Typ	42 Typ	25 Typ				2
	Precipitation Hardened	TF00	70 Typ	65 Typ	18 Typ				2
	Solution Heat Treated	TB00	45 Typ	14 Typ	40 Typ				0.5
	Solution Heat Treated	TB00	34 Typ	19 Typ	40 Typ				0.04
Plate	Precipitation Hardened	TF00	56 Typ	40 Typ	30 Typ	68 Typ			3
Plate	Precipitation Hardened	TF00	58 Typ	42 Typ	25 Typ	70 Typ			2
Rod	1/4 Hard and Precipitation Heat Treated	TH01	77 Typ	65 Typ	16 Typ	82 Typ			0.5	60.5
	Hard and Precipitation Heat Treated	TH04	77 Typ	65 Typ	16 Typ	82 Typ			0.5	60.5
	Hard and Precipitation Heat Treated	TH04	86 Typ	77 Typ	14 Typ				0.156	90
	Precipitation Hardened	TF00	65 Typ	55 Typ	18 Typ	70 Typ			3
	Precipitation Hardened	TF00	72 Typ	65 Typ	18 Typ	80 Typ			1
	Precipitation Hardened	TF00	70 Typ	65 Typ	18 Typ	75 Typ			2
	Precipitation Hardened	TF00	70 Typ	55 Typ	21 Typ	70 Typ			0.5
	Precipitation Hardened	TF00	55 Typ	43 Typ	25 Typ	68 Typ		7.3 Typ	4
	Solution Heat Treated	TB00	45 Typ	14 Typ	40 Typ				0.5
	Solution Heat Treated and Cold Worked: Hard	TD04	57 Typ	56 Typ	11 Typ	65 Typ			0.5	60.5
	Solution Heat Treated and Cold Worked: Hard	TD04	74 Typ	73 Typ	5 Typ				0.156	91
Tube	Annealed	O61	40 Typ	15 Typ	50 Typ		59 Typ		0.094
	Hard and Precipitation Heat Treated	TH04	69 Typ	63 Typ	26 Typ	84 Typ			0.212	76
	Solution Heat Treated and Cold Worked: Hard	TD04	59 Typ	57 Typ	21 Typ	67 Typ			0.212	76

PHYSICAL PROPERTIES

Melting Point – Liquidus°F	1967
Melting Point – Solidus°F	1958
Densitylb/cu in. at 68°F	0.321
Specific Gravity	8.89
Electrical Conductivity% IACS at 68°F	80 ⁽¹⁾
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F	187 ⁽²⁾
Coefficient of Thermal Expansion 68-21210 to -6 power per °F (68 – 212°F)	9.8
Specific Heat CapacityBtu/ lb /°F at 68°F	0.092
Modulus of Elasticity in Tensionksi	17000
Modulus of Rigidityksi	7200

FABRICATION PROPERTIES

Technique	Suitability
Soldering	Good
Brazing	Good
Oxyacetylene Welding	Not Recommended
Gas Shielded Arc Welding	Good
Coated Metal Arc Welding	Not Recommended
Spot Weld	Not Recommended
Seam Weld	Not Recommended
Butt Weld	Fair
Capacity for Being Cold Worked	Excellent
Capacity for Being Hot Formed	Good
Forgeability Rating	80
Machinability Rating	20

APPLICABLE SPECIFICATIONS

Form	Specific Sub-Form	System	Standard	Description
Bar
Bar		MILITARY	MIL-C-19311	COPPER-CHROMIUM-ALLOY FORGINGS, ROD, BAR, AND STRIP
Forgings	Forgings	MILITARY	MIL-C-19311	COPPER-CHROMIUM-ALLOY FORGINGS, ROD, BAR, AND STRIP
Forgings
Rod
Rod		MILITARY	MIL-C-19311	COPPER-CHROMIUM-ALLOY FORGINGS, ROD, BAR, AND STRIP
Strip		MILITARY	MIL-C-19311	COPPER-CHROMIUM-ALLOY FORGINGS, ROD, BAR, AND STRIP
Wire	Soft	ASTM	F9	ROUND WIRE FOR USE AS GRID SIDE RODS IN ELECTRON TUBES