C64200

Description

An American free machining Silicon aluminium bronze where its unique combined properties of high strength, good fatigue, excellent corrosion resistance in salt water and low magnetic permeability, make it a popular choice for many sea water applications. C642 aluminium bronze has higher ductility than the nickel aluminium bronzes and can be cold worked to enhance the mechanical properties. The alloy has also excellent anti-galling and bearing properties. The low magnetic properties enables the alloy to be used in Navy applications such as mine hunters, for instrumentation such as sonar, compasses and other sensitive instruments which may also require good corrosion resistance in a hostile environment.

Automotive	Electrical	Fasteners	Industrial	Marine
Valve Guides, Automobile Engine	Pole Line Hardware	Bolts	Cams	Hardware
		Nuts	Gears
			Valve Bodies
			Valve Components
			Valve Stems

COMMON FABRICATION PROCESSES

Forging
Hot Forming
Machining

CHEMICAL COMPOSITION

Elements
Cu^(1,2)	Pb	Sn	Zn	Fe	Ni⁽³⁾	Al	As	Mn	Si
(1) Cu value includes Ag. (2) Cu + Sum of Named Elements 99.5% min. (3) Ni value includes Co.
Min (%)							6.3			1.5
Max (%)	Rem	0.05	0.20	0.50	0.30	0.25	7.6	0.09	0.10	2.2

MECHANICAL PROPERTIES

Form	Temper	Temper Code	Tensile Strength (ksi)	YS-0.5% Ext (ksi)	Elongation (%)	Rockwell B scale	Shear Strength (ksi)	Fatigue Strength** (ksi)	Section Size (in)	Cold Work (%)
* Measured at room temperature, 68°F (20°C).** Fatigue Strength: 100 x 10⁶ cycles, unless indicated as [N] x 10⁶.
Bar	As Hot Extruded	M30	75 Typ	35 Typ	32 Typ	77 Typ			0.75
Forgings	As Hot Forged – Air Cooled	M10	79 Typ	38 Typ	30 Typ	78 Typ			2
Rod	As Hot Extruded	M30	75 Typ	35 Typ	32 Typ	77 Typ			0.75
	Hard	H04	102 Typ	68 Typ	22 Typ	94 Typ	59 Typ	50 Typ	0.75	15
	Hard	H04	93 Typ	60 Typ	26 Typ	90 Typ			1.5	10
	Light Anneal	O50	90 Typ	55 Typ	28 Typ	89 Typ			0.75
	Light Anneal	O50	92 Typ	58 Typ	22 Typ	98 Typ			0.5

PHYSICAL PROPERTIES

Melting Point – Liquidus°F	1840
Melting Point – Solidus°F	1800
Densitylb/cu in. at 68°F	0.278
Specific Gravity	7.69
Electrical Conductivity% IACS at 68°F	8
Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F	26
Coefficient of Thermal Expansion 68-57210 to -6 power per °F (68 – 572°F)	10
Specific Heat CapacityBtu/ lb /°F at 68°F	0.09
Modulus of Elasticity in Tensionksi	16000
Modulus of Rigidityksi	6000

FABRICATION PROPERTIES

Technique	Suitability
Soldering	Not Recommended
Brazing	Fair
Oxyacetylene Welding	Not Recommended
Gas Shielded Arc Welding	Fair
Coated Metal Arc Welding	Fair
Spot Weld	Fair
Seam Weld	Fair
Butt Weld	Fair
Capacity for Being Cold Worked	Poor
Capacity for Being Hot Formed	Excellent
Forgeability Rating	80
Machinability Rating	60

APPLICABLE SPECIFICATIONS

Form	Specific Sub-Form	System	Standard	Description
Bar		AMS	4631	ALUMINUM BRONZE RODS, BARS, AND FORGINGS
Bolts		ASTM	F468	NONFERROUS BOLTS, HEX CAP SCREWS, AND STUDS FOR GENERAL USE
Die	Forgings	AMS	4631	ALUMINUM BRONZE RODS, BARS, AND FORGINGS
Forgings, Die (Hot Pressed)		ASME	SB283	COPPER AND COPPER ALLOY DIE FORGINGS (HOT PRESSED)
Forgings, Die (Hot Pressed)		ASTM	B283/B283M	COPPER AND COPPER ALLOY DIE FORGINGS (HOT PRESSED)
Nuts		ASTM	F467	NONFERROUS NUTS FOR GENERAL USE
Rod		SAE	J463	WROUGHT COPPER AND COPPER ALLOYS
		SAE	J461	WROUGHT AND CAST COPPER ALLOYS
		AMS	4631	ALUMINUM BRONZE RODS, BARS, AND FORGINGS
Rod, Bar & Shapes	Aluminum Bronze	ASME	SB150	ALUMINUM BRONZE ROD, BAR, AND SHAPES
	Aluminum Bronze	ASTM	B150/B150M	ALUMINUM BRONZE ROD, BAR AND SHAPES
	Forgings	ASTM	B124/B124M	COPPER AND COPPER-ALLOY FORGING ROD, BAR AND SHAPES
Screws		ASTM	F468	NONFERROUS BOLTS, HEX CAP SCREWS, AND STUDS FOR GENERAL USE
Studs		ASTM	F468	NONFERROUS BOLTS, HEX CAP SCREWS, AND STUDS FOR GENERAL USE