C72900

Description

C72900 is an extruded and drawn, spinodal hardened, copper nickel-tin (CuNiSn) bronze alloy. It is great in high-strength applications. It resists mechanical wear, galling, stress relaxation, corrosion and erosion. It is non-magnetic and easy to machine into complex components. It is also and ecofriendly material, being that it is lead and beryllium free. C72900 is an excellent alternative to nickel alloys, aluminum bronzes, and beryllium copper.

Electrical	Industrial	Marine
Connectors	Springs	Marine Components
Contacts	Wire
Controls
Miniaturized Sockets
Relay Elements
Switches

COMMON FABRICATION PROCESSES

No fabrication process properties for this alloy

CHEMICAL COMPOSITION

Elements
Cu^(1,2)	Pb⁽³⁾	Sn	Zn	Fe	Ni⁽⁴⁾	Mg	Mn	Nb
(1) Cu + Sum of Named Elements 99.7% min. (2) Cu value includes Ag. (3) 0.005% Pb max. for hot rolling. (4) Ni value includes Co.
Min (%)			7.5			14.5
Max (%)	Rem	0.02	8.5	0.50	0.50	15.5	0.15	0.30	0.10

MECHANICAL PROPERTIES

Form	Temper	Temper Code	Tensile Strength (ksi)	YS-0.2% Offset (ksi)	YS-0.05% Offset	Elongation (%)
* Measured at room temperature, 68°F (20°C).
Strip	1/2 Hard and Spinodal Hardened (1/2 TS)	TS02	145 Min for Standard		125 Min for Standard	3 Typ
	1/4 Hard and Spinodal Hardened (1/4 TS)	TS01	130 Min for Standard		105 Min for Standard	4 Typ
	3/4 Hard and Spinodal Hardened (3/4 TS)	TS03	155 Min for Standard		135 Min for Standard	2 Typ
	Hard and Spinodal Hardened	TS04	165 Min for Standard		145 Min for Standard	2 Typ
	Mill-hardened Temper, TM – 1/2 Hard	TM02	105 Min for Standard	90 Min for Standard	80 Min for Standard	15 Typ
	Mill-hardened Temper, TM – 1/2 Hard	TM00	95 Min for Standard	75 Min for Standard	70 Min for Standard	22 Typ
	Mill-hardened Temper, TM – Hard	TM04	115 Min for Standard	105 Min for Standard	95 Min for Standard	10 Typ
	Mill-hardened Temper, TM – XHMS Spring	TM08	150 Min for Standard	140 Min for Standard	125 Min for Standard	2 Typ
	Mill-hardened Temper, TM -XHM – Extra Hard	TM06	130 Min for Standard	120 Min for Standard	105 Min for Standard	6 Typ
	Solution Heat Treated	TB00	64 Min for Standard		24 Min for Standard	32 Typ
	Solution Heat Treated and Cold Worked: 1/2 Hard	TD02	85 Min for Standard			8 Typ
	Solution Heat Treated and Cold Worked: 1/4 Hard	TD01	75 Min for Standard		50 Min for Standard	18 Typ
	Solution Heat Treated and Cold Worked: 3/4 Hard	TD03	95 Min for Standard		80 Min for Standard	3 Typ
	Solution Heat Treated and Cold Worked: Hard	TD04	100 Min for Standard		85 Min for Standard
	Spinodal Hardened-Low Strength (ATLS)	TX00	120 Min for Standard		95 Min for Standard	6 Typ

PHYSICAL PROPERTIES

Melting Point – Liquidus°F	2039
Melting Point – Solidus°F	1742
Densitylb/cu in. at 68°F	0.323
Specific Gravity	8.94
Electrical Conductivity% IACS at 68°F	7.8 ⁽¹⁾
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F	17
Coefficient of Thermal Expansion 68-57210 to -6 power per °F (68 – 572°F)	9.1
Specific Heat CapacityBtu/ lb /°F at 68°F	0.09
Modulus of Elasticity in Tensionksi	18500
Modulus of Rigidityksi	7500

FABRICATION PROPERTIES

Soldering	Excellent
Brazing	Excellent
Oxyacetylene Welding	Good
Gas Shielded Arc Welding	Excellent
Coated Metal Arc Welding	Excellent
Spot Weld	Excellent
Seam Weld	Excellent
Butt Weld	Excellent
Capacity for Being Cold Worked	Excellent
Capacity for Being Hot Formed	Good