Description

Cupro CNB It is a multi-purpose copper alloy that has both the advantages of the physical properties of copper and moderate mechanical properties.
Cupro NB has higher electrical and thermal conductivity altough the areas of use are the same as Cupro CNB

Electrical	Fasteners	Industrial
Conductors	Fasteners	Die casting plunger tips
Connectors, Heavy Duty		High Flux Electromagnets
Fuse Clips		Springs
Instrument Parts		Thermal Transfer Plates
Relay Parts		Welding Equipment
Switch Parts

COMMON FABRICATION PROCESSES

Blanking
Drilling
Forming and Bending
Tapping
Turning

CHEMICAL COMPOSITION

Elements
Cu^(1,2)	Fe	Ni	Al	Be	Co	Si
(1) Cu + Sum of Named Elements 99.5% min. (2) Cu value includes Ag.
Min (%)			1.4		0.2
Max (%)	Rem	0.10	2.2	0.20	0.6	0.3	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	Fatigue Strength** (ksi)	Section Size (in)
* Measured at room temperature, 68°F (20°C).** Fatigue Strength: 100 x 10⁶ cycles, unless indicated as [N] x 10⁶.
Flat Products	1/2 Hard and Precipitation Heat Treated	TH02	115 Typ		108 Typ	8 Typ	98 Typ	81 Typ	35 Typ
	Hard and Precipitation Heat Treated	TH04	115 Typ		110 Typ	8 Typ	98 Typ	81 Typ
	Precipitation Hardened	TF00	110 Typ		90 Typ	12 Typ	96 Typ	80 Typ
	Solution Heat Treated	TB00	45 Typ		25 Typ	28 Typ	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	78 Typ		70 Typ	5 Typ	83 Typ	72 Typ
Forgings	Precipitation Hardened	TF00	115 Typ	90 Typ			92 Typ			4
Forgings	Solution Heat Treated	TB00	42 Typ	20 Typ			50 Typ
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

PHYSICAL PROPERTIES

Melting Point – Liquidus°F	1955
Melting Point – Solidus°F	1885
Densitylb/cu in. at 68°F	0.317
Specific Gravity	8.77
Electrical Conductivity% IACS at 68°F	48 ⁽¹⁾
Electrical Conductivity% IACS at 68°F	45 ⁽²⁾
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F	120
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	19200
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

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
Extrusions
Forgings
Forgings & Extrusions	ASTM	B870	COPPER-BERYLLIUM ALLOY FORGINGS AND EXTRUSION ALLOYS (UNS Nos. C17500 AND C17510)
Heat Exchanger Tube	ASTM	B944	COPPER-BERYLLIUM WELDED HEAT EXCHANGER AND CONDENSER TUBE UNS No. C175100
Plate	ASTM	B534	COPPER-COBALT-BERYLLIUM ALLOY, PLATE, SHEET, STRIP, AND ROLLED BAR
Rod	SAE	J463	WROUGHT COPPER AND COPPER ALLOYS
	ASTM	B441	COPPER-COBALT-BERYLLIUM (UNS NO. C17500) AND COPPER-NICKEL-BERYLLIUM (UNS NO. C17510) ROD AND BAR
	SAE	J461	WROUGHT AND CAST COPPER ALLOYS
Seamless Tube	ASTM	B937	COPPER-BERYLLIUM SEAMLESS TUBE (UNS Nos.17500 and 17510)
Shapes	SAE	J463	WROUGHT COPPER AND COPPER ALLOYS
Shapes	SAE	J461	WROUGHT AND CAST COPPER ALLOYS
Sheet	ASTM	B534	COPPER-COBALT-BERYLLIUM ALLOY, PLATE, SHEET, STRIP, AND ROLLED BAR
Strip	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
	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
Tube	SAE	J463	WROUGHT COPPER AND COPPER ALLOYS
Tube	SAE	J461	WROUGHT AND CAST COPPER ALLOYS

Cupro NB