ALLOY DESCRIPTION

This alloy offers the highest strength of the common screw machine alloys. The superior stress corrosion resistance of the T73 and T7351 tempers makes it a logical replacement for 2024, 2014 and 2017 in many of the most critical applications. The T6 and T651 tempers have fair machinability, resistance welding and corrosion resistance ratings. This alloy is heavily utilized by the aircraft and ordnance industries because of its superior strength.

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	33	228	15	103	17	60	22	152			10.3	71.0
T6, T651	83	572	73	503	11	150	48	331	23	158	10.3	71.0
T73, T7351	73	503	63	434	13		44	303	23	158	10.3	71.0

COMPARATIVE CHARACTERISTICS

Temper	Corrosion Resistance		Cold Workability3	Machinability3	Anodize Response3	Brazeability4	Weldability4
	General1	Stress2					Gas	Arc	Spot
T6, T651	C	C	D	C	B	D	D	D	B
T73, T7351	C	B	D	C	B	D	D	D	B

• 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-QQ-A-225/9	AMS-QQ-A-200/11
AMS 4187	AMS 4154
	AMS 4166
AMS 4122	AMS 4167
AMS 4123	AMS 4168
AMS 4124	AMS 4169

CHEMICAL COMPOSITION LIMITS

									Others
Weight %	Si	Fe	Cu	Mn	Mg	Cr	Zn	Ti	Each	Total
Minimum			1.20		2.10	0.18	5.10
Maximum;	0.40	0.50	2.00	0.30	2.90	0.28	6.10	0.20	0.05	0.15

TYPICAL PHYSICAL PROPERTIES

Characteristic			English	Metric
Nominal Density (68 ºF / 20 ºC)			0.101 lbs./in.3	2.80 Mg/m3
Melting Range			990 ºF - 1175 ºF	532 ºC - 635 ºC
Specifi c Heat (212 ºF / 100 ºC)			0.23 BTU/lb. - ºF	960 J/kg - ºK
Coefficient of Thermal Expansion	Linear 68 ºF - 212 ºF 20 ºC - 100 ºC		13.0 micro in./in.-°F	23.4 micro m/m -°K
	Volumetric 68 ºF / 20 ºC		3.78 x 10-5in.3/in.3 -°F	68 x 10-6m3/m3 -°K
Thermal Conductivity (68 ºF / 20 ºC)	T6, T651		75 BTU/ft. - hr. - °F	130 W/m - °K
	T73, T7351		90 BTU/ft. - hr. - ºF	155 W/m - ºK
Electrical Conductivity (68 ºF / 20 ºC)	Equal Volume	T6, T651	33% IACS
		T73, T7351	40% IACS
	Equal Weight	T6, T651	105% IACS
		T73, T7351