Cupro CB

Description

Hard copper alloy with high thermal conductivity and high mechanical properties combined with good hardness and high temperature strength.
Good resistance to tempering. Nitriding and case-hardening are not suitable.

Electrical	Fasteners	Industrial	Other
Conductors	Fasteners	Die casting plunger tips	Stressed Parts
Connectors		Resistance and Spot Welding Tips
Fuse Clips		Resistance Welding Equipment
Relay Parts		Seam Welding Dies
Switch Parts		Springs
		Tooling for Plastic Molds

COMMON FABRICATION PROCESSES

Blanking
Drilling
Forming and Bending
Tapping
Turning

CHEMICAL COMPOSITION

Elements
Cu^(1,2)	Fe	Al	Be	Co	Si
(1) Cu value includes Ag. (2) Cu + Sum of Named Elements 99.5% min.
Min (%)				0.4	2.4
Max (%)	Rem	0.10	0.20	0.7	2.7	0.20

MECHANICAL PROPERTIES

Form	Temper	Temper Code	Tensile Strength (ksi)	YS-0.2% Offset (ksi)	YS-0.5% Ext (ksi)	Elongation (%)	Rockwell B scale	Rockwell 30T scale	Section Size (in)
* Measured at room temperature, 68°F (20°C).
Flat Products	Hard and Precipitation Heat Treated	TH04	110 Min for Standard	95 Min for Standard		8 Min for Standard	98 Typ	81 Typ
	Precipitation Hardened	TF00	100 Min for Standard	80 Min for Standard		10 Min for Standard	96 Typ	80 Typ
	Solution Heat Treated	TB00	35 Min for Standard	25 Min for Standard		20 Min for Standard	32 Typ	36 Typ
	Solution Heat Treated and Cold Worked: 1/2 Hard	TD02	68 Typ		60 Typ	8 Typ	70 Typ	64 Typ
	Solution Heat Treated and Cold Worked: Hard	TD04	70 Min for Standard	55 Min for Standard		3 Min for Standard	83 Typ	72 Typ
Forgings	Precipitation Hardened	TF00	115 Typ	90 Typ			92 Min		4
Forgings	Solution Heat Treated	TB00	42 Typ	20 Typ			50 Max
Rod	Hard and Precipitation Heat Treated	TH04	115 Typ		110 Typ	14 Typ	98 Typ
	Precipitation Hardened	TF00	110 Typ		90 Typ	18 Typ	96 Typ
	Solution Heat Treated	TB00	45 Typ		25 Typ	28 Typ	35 Typ
	Solution Heat Treated and Cold Worked: Hard	TD04	72 Typ		65 Typ	12 Typ	68 Typ
Tube	Hard and Precipitation Heat Treated	TH04	110 Min for Standard	80 Min			95 Min
	Precipitation Hardened	TF00	100 Min for Standard	80 Min for Standard		45 Min for Standard	92 Min for Standard
	Solution Heat Treated	TB00	35 Min for Standard				50 Max
	Solution Heat Treated and Cold Worked: Hard	TD04	65 Min for Standard				60 Min for Standard

PHYSICAL PROPERTIES

Melting Point – Liquidus°F	1955
Melting Point – Solidus°F	1885
Densitylb/cu in. at 68°F	0.311
Specific Gravity	8.62
Electrical Conductivity% IACS at 68°F	45 ⁽¹⁾
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F	120 ⁽²⁾
Coefficient of Thermal Expansion 68-39210 to -6 power per °F (68 – 392°F)	9.8
Specific Heat CapacityBtu/ lb /°F at 68°F	0.1
Modulus of Elasticity in Tensionksi	19000
Modulus of Rigidityksi	7500

FABRICATION PROPERTIES

Technique	Suitability
Soldering	Good
Brazing	Good
Oxyacetylene Welding	Not Recommended
Gas Shielded Arc Welding	Fair
Coated Metal Arc Welding	Fair
Spot Weld	Good
Seam Weld	Fair
Butt Weld	Fair
Capacity for Being Cold Worked	Excellent
Capacity for Being Hot Formed	Good
Machinability Rating	40

APPLICABLE SPECIFICATIONS

Form	System	Standard	Description
Bar	ASTM	B441	COPPER-COBALT-BERYLLIUM (UNS NO. C17500) AND COPPER-NICKEL-BERYLLIUM (UNS NO. C17510) ROD AND BAR
Bar	ASTM	B534	COPPER-COBALT-BERYLLIUM ALLOY, PLATE, SHEET, STRIP, AND ROLLED BAR
Forgings & Extrusions	ASTM	B870	COPPER-BERYLLIUM ALLOY FORGINGS AND EXTRUSION ALLOYS (UNS Nos. C17500 AND C17510)
Plate	ASTM	B534	COPPER-COBALT-BERYLLIUM ALLOY, PLATE, SHEET, STRIP, AND ROLLED BAR
Rod	ASTM	B441	COPPER-COBALT-BERYLLIUM (UNS NO. C17500) AND COPPER-NICKEL-BERYLLIUM (UNS NO. C17510) ROD AND BAR
	SAE	J463	WROUGHT COPPER AND COPPER ALLOYS
	SAE	J461	WROUGHT AND CAST COPPER ALLOYS
Seamless Tube	ASTM	B937	COPPER-BERYLLIUM SEAMLESS TUBE (UNS Nos.17500 and 17510)
Shapes	SAE	J461	WROUGHT AND CAST COPPER ALLOYS
Shapes	SAE	J463	WROUGHT COPPER AND COPPER ALLOYS
Sheet	ASTM	B534	COPPER-COBALT-BERYLLIUM ALLOY, PLATE, SHEET, STRIP, AND ROLLED BAR
Strip	MILITARY	MIL-C-81021	COPPER BERYLLIUM ALLOY (COPPER ALLOY NUMBERS C17500 AND C17510) STRIP
	ASTM	B534	COPPER-COBALT-BERYLLIUM ALLOY, PLATE, SHEET, STRIP, AND ROLLED BAR
	SAE	J461	WROUGHT AND CAST COPPER ALLOYS
	ASTM	B888/B88M	COPPER ALLOY STRIP FOR USE IN MANUFACTURE OF ELECTRICAL CONNECTORS OR SPRING CONTACTS
	SAE	J463	WROUGHT COPPER AND COPPER ALLOYS
Tube	SAE	J463	WROUGHT COPPER AND COPPER ALLOYS
Tube	SAE	J461	WROUGHT AND CAST COPPER ALLOYS