ALLOY DESCRIPTION

This alloy is used in aerospace applications such as space booster and fuel tanks. The alloy is readily weldable. It is useful over a temperature range of -452º to 600 ºF. The alloy also has good fracture toughness. The T8 temper is resistant to stress corrosion cracking.

TYPICAL MECHANICAL PROPERTIES

Temper	Tensile (.500” Dia. Specimen)					Hardness	Shear		Fatigue*		Modulus
	Ultimate		Yield		Elongation/4D	Brinell 500 kg 10 mm	Ultimate Shearing Strength		Endurance Limit - R.R. Moore Type		Modulus of Elasticity
	KSI	MPa	KSI	MPa	%		KSI	MPa	KSI	MPa	KSI x 103	Gpa
0	25	172	11	76	18	45	-	-	-	-	10.6	73.1
T3, T3511	52	359	36	248	17	95	-	-	-	-	10.6	73.1
T8, T851, T8511	65	455	51	352	10	125	-	-	15	103	10.6	73.1

COMPARATIVE CHARACTERISTICS

Temper	Corrosion Resistance		Cold Workability3	Machinability3	Anodize Response3	Brazeability4	Weldability4
	General1	Stress2					Gas	Arc	Spot
0	-	-	-	-	-	D	D	A	B
T3, T3511	D	C	C	B	B	D	A	A	A
T8, T851, T8511	D	B	D	B	B	D	A	A	A

• Ratings A through E are relative ratings in decreasing order of merit, based on exposures to sodium chloride solution by intermittent spraying or immersion. Alloys with A and B ratings can be used in industrial and seacoast atmospheres without protection. Alloys with C, D and E ratings generally should be protected at least on faying surfaces.

• Stress-corrosion cracking ratings are based on service experience and on laboratory tests of specimens exposed to the 3.5% sodium chloride alternate immersion test.
  A= No known instance of failure in service or in laboratory tests.
  B= No known instance of failure in service; limited failures in laboratory tests of short transverse specimens.
  C= Service failures with sustained tension stress acting in short transverse direction relative to grain structure; limited failures in laboratory tests of long transverse specimens.
  D= Limited service failures with sustained longitudinal or long transverse areas.

• Ratings A through D for Workability (cold), A through E for Machinability and A through C for Anodize Response, are relative ratings in decreasing order of merit.

• Ratings A through D for Weldability and Brazeability are relative ratings defi ned as follows:
  A= Generally weldable by all commercial procedures and methods.
  B= Weldable with special techniques or for specifi c applications that justify preliminary trials or testing to develop welding procedure and weld performance.
  C= Limited weldability because of crack sensitivity or loss in resistance to corrosion and mechanical properties.
  D= No commonly used welding methods have been developed.

APPLICABLE SPECIFICATIONS

Cold Finished	Extruded
ASTM B211	ASTM B221
	AMS 4162
	AMS 4163

CHEMICAL COMPOSITION LIMITS

										Others
Weight %	Si	Fe	Cu	Mn	Mg	Zn	Ti	V	Zx	Each	Total
Minimum	-	-	5.8	0.20	-	-	0.02	0.05	0.10	-	-
Maximum;	0.20	0.30	6.8	0.40	0.02	0.10	0.10	0.15	0.25	0.05	0.15

TYPICAL PHYSICAL PROPERTIES

Characteristic			English	Metric
Nominal Density (68 ºF / 20 ºC)			0.103 lbs./in.3	2.84 Mg/m3
Melting Range			1010 °F - 1190 °F	543 °C - 643 °C
Specifi c Heat (212 ºF / 100 ºC)			0.206 BTU/lb. - °F	864 J/kg - °K
Coefficient of Thermal Expansion	Linear 68 ºF - 212 ºF 20 ºC - 100 ºC		12.5 micro in./in.-°F	22.5 micro m/m -°K
	Volumetric 68 ºF / 20 ºC		3.62 x 10-5in.3/in.3 -°F	65 x 10-6m3/m3 -°K
Thermal Conductivity (68 ºF / 20 ºC)	T3, T3551		67 BTU/ft. - hr. - °F	116 W/m - °K
	T8, T851, T8511		75 BTU/ft. - hr. - ºF	130 W/m - ºK
Electrical Conductivity (68 ºF / 20 ºC)	Equal Volume	T3, T3551		28% IACS
		T8, T851, T8511		30% IACS