ALLOY DESCRIPTION

One of the strongest heat-treatable alloys for screw machine applications. This alloy, while commonly found in forging applications, offers good machinability and high strength. Corrosion resistance is only fair; however, weldability is good with arc and resistance methods. In many applications this alloy can be substituted for 2024.

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	27	186	14	97	18	45	18	125	13	90	10.6	73.1
T4,T451	62	427	42	290	20	105	38	260	20	140	10.6	73.1
T6,T651	70	483	60	414	13	135	42	290	18	125	10.6	73.1

COMPARATIVE CHARACTERISTICS

Temper	Corrosion Resistance		Cold Workability3	Machinability3	Anodize Response3	Brazeability4	Weldability4
	General1	Stress2					Gas	Arc	Spot
0	-	-	B	D	C	D	D	D	B
T4,T451	D	C	C	B	C	D	D	B	B
T6,T651	D	C	D	B	C	D	D	B	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-225/4	AMS-QQ-A-200/2
AMS 4121	AMS 4153

CHEMICAL COMPOSITION LIMITS

									Others
Weight %	Si	Fe	Cu	Mn	Mg	Cr	Zn	Ti	Each	Total
Minimum	0.50	-	3.9	0.40	0.20	-	-	-	-	-
Maximum;	1.2	0.7	5.0	1.2	0.8	0.10	0.25	0.15	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			945 °F - 1180 °F	507 °C - 638 °C
Specifi c Heat (212 ºF / 100 ºC)			-	-
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	65.1 x 10-6m3/m3 -°K
Thermal Conductivity (68 ºF / 20 ºC)	O Temper		111 BTU/ft. - hr. - °F	192 W/m - °K
	T4,T451		77.4 BTU/ft. - hr. - ºF	134 W/m - ºK
	T6,T651		89.5 BTU/ft. - hr. - ºF	155 W/m - ºK
Electrical Conductivity (68 ºF / 20 ºC)	Equal Volume	O Temper		50% IACS
		T4,T451		34% IACS
		T6,T651		40% IACS
	Equal Weight	O Temper		159% IACS
		T4,T451		108% IACS
		T6,T651		127% IACS