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Aluminum		Balance
Bismuth		0.2 - 0.6
Copper		5 - 6
Iron		0.7 max
Lead		0.2 - 0.6
Remainder Each		0.05 max
Remainder Total		0.15 max
Silicon		0.4 max
Zinc		0.3 max

Principal Design Features		This is an age-hardenable alloy noted for its free-machining characteristics and good mechanical properties.

Applications		Commonly used in the manufacture of screw machine products, machine parts, atomizer and hose parts, pipe stems, cigarette holders, and tube fittings.

Machinability		This is a free-machining alloy and both carbide or high-speed tool steel tooling may be used. Carbide tooling is preferred. Rake angles should be 50 degrees for top rake, 32 degree cutting edge, 15 degree side rake and 10 degree clearance. Oils should be used for heavy cutting, Light cutting may be done dry.

Forming		Bending, shaping and forming in general may be don with conventional tooling. Following cold working the part is usually age hardened to develop better strength properties.

Welding		Welding of this alloy is NOT recommended. No common methods of producing satisfactory welds have been developed.

Heat Treatment		Optimum strength (T8 temper) is obtained by solution heat treatment at 950 F for adequate time to insure complete heating followed by a water quench and then cold working to desired part shape and followed by a 320 F heating for 15 hours and air cool.

Forging		Forging, or hot working, may be accomplished in the temperature range of 550 to 900 F.

Hot Working		Hot working may be done at temperatures of 550 to 900 F.

Cold Working		This alloy is noted for its free-machining capability. It may be cold worked by all conventional means. An aging heat treatment to develop optimum strength may follow cold working.

Annealing		Annealing is done at 775 F by holding at that temperature for 2 to 3 hours, followed by controlled cooling at a rate of 50 F per hour down to 500 F and then air cooling.

Aging		Age hardening (typical for T4 temper) is done by a 950 F soak for 3 hours followed by water quench. Other temper variations are possible with additional treatment such as heating to 320 F for 14 hours, after solution heating, to produce T 8 temper.

Tempering		Not applicable .

Hardening		Age harden by 950 F heat treatment for 3 hours and water quench. See also "Aging" and "Tempering".

Other Physical Props		Electrical conductivity is 38% of copper.

Other Mechanical Props		Shear strength (ultimate) 32 ksi to T3 and 35 ksi for T8

Physical Data : [top]

Density (lb / cu. in.)	0.102
Specific Gravity	2.83
Melting Point (Deg F)	1000
Poissons Ratio	0.33
Thermal Conductivity	990
Modulus of Elasticity Tension	10.2
Modulus of Elasticity Torsion	3.85

Form		Round Bar
Condition		T3
Temper		68
Tensile Strength		55
Yield Strength		43
Reduction of Area		15
Brinnell		95
Form		Round Bar
Condition		T3
Temper		75
Tensile Strength		55
Yield Strength		43
Elongation		15
Form		Round Bar
Condition		T3
Temper		212
Tensile Strength		47
Yield Strength		34
Elongation		16
Form		Round Bar
Condition		T3
Temper		300
Tensile Strength		28
Yield Strength		19
Elongation		25
Form		Round Bar
Condition		T3
Temper		400
Tensile Strength		16
Yield Strength		11
Elongation		35
Form		Round Bar
Condition		T3
Temper		500
Tensile Strength		6.5
Yield Strength		3.8
Elongation		45
Form		Round Bar
Condition		T3
Temper		600
Tensile Strength		3.1
Yield Strength		1.8
Elongation		90
Form		Round Bar
Condition		T3
Temper		700
Tensile Strength		2.3
Yield Strength		1.4
Elongation		125
Form		Round Bar
Condition		T8
Temper		68
Tensile Strength		59
Yield Strength		45
Reduction of Area		12
Brinnell		100