|
KAISER ALUMINUM
TECHNICAL REFERENCE LIBRARY No. 1008
| Technical Data - ALLOY 2024 |
Call 1-800-USE-2011 |
| Chemical Composition
Limits |
Others |
| Weight % |
Si |
Fe |
Cu |
Mn |
Mg |
Cr |
Zn |
Ti |
Each |
Total |
| Minimum |
- |
- |
3.8 |
0.30 |
1.2 |
- |
- |
- |
- |
- |
| Maximum |
0.50 |
0.50 |
4.9 |
0.9 |
1.8 |
0.10 |
0.25 |
0.15 |
0.05 |
0.15 |
| Typical
Physical Properties |
| Characteristic |
English |
Metric |
| Nominal
Density (68 °F/20 °C) |
0.100
lbs./in.3 |
2.77 Mg/m3 |
| Melting
Range |
935 °F -
1180 °F |
502 °C -
638 °C |
| Specific
Heat (212 °F/100 °C) |
0.209
BTU/lb. - °F |
875 J/kg
- °K |
| Coefficient of Thermal Expansion |
|
12.7
micro in./in.-°F |
22.9
micro m/m -°K |
|
|
3.67 x 10-5in.3/in.3
-°F |
66 x 10-6m3/m3
-°K |
| Thermal Conductivity (68°F/20°C) |
O Temper |
110
BTU/ft. - hr. - °F |
190 W/m -
°K |
| T4,T351 |
69
BTU/ft. - hr. - °F |
120 W/m -
°K |
| T6,T851 |
88
BTU/ft. - hr. - °F |
151 W/m - °K |
| Electrical Conductivity
(68°F/20°C) |
Equal Volume |
O Temper |
50% IACS |
| T4,T351 |
30% IACS |
| T6,T851 |
38% IACS |
| Equal Weight |
O Temper |
160% IACS |
| T4,T351 |
96% IACS |
| T6,T851 |
122% IACS |
| Typical Mechanical Properties |
| |
Tensile
(.500" Dia. Specimen) |
Hardness |
Shear |
Fatigue* |
Modulus |
| Temper |
Yield |
Ultimate |
Elongation/4D |
|
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 |
11 |
76 |
27 |
186 |
22 |
47 |
18 |
124 |
13 |
90 |
10.6 |
73.1 |
| T4,T351 |
47 |
324 |
68 |
469 |
19 |
120 |
41 |
283 |
20 |
138 |
10.6 |
73.1 |
| T6 |
57 |
393 |
69 |
476 |
10 |
125 |
41 |
283 |
18 |
124 |
10.6 |
73.1 |
| T851 |
65 |
448 |
70 |
482 |
7 |
128 |
43 |
296 |
18 |
124 |
10.6 |
73.1 |
|
*5 x 10E8
cycles of reversed stress |
| Comparative Characteristics |
| Temper |
Corrosion
Resistance |
|
|
|
|
Weldability4 |
| General1 |
Stress2 |
Gas |
Arc |
Spot |
| T4,T351 |
D |
C |
C |
B |
C |
D |
C |
B |
B |
| T6 |
D |
B |
C |
B |
C |
D |
D |
C |
B |
| T851 |
D |
B |
D |
B |
C |
D |
D |
C |
B |
| 1 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. |
| 2 Stress-corrosion cracking ratings
are based on service experience and 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 |
|
|
| 3 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. |
| 4 Ratings A through D for Weldability
and Brazeability are relative ratings defined as follows: |
| A= |
Generally weldable by all commercial
procedures and methods. |
| B= |
Weldable with special techniques or for
specific applications that justify preliminary trails 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 |
| QQ-A-225/6 |
QQ-A-200/3 |
| AMS 4112 |
AMS 4152 |
| |
AMS 4164 |
| AMS 4120 |
AMS 4165 |
| 2024 is heavily
utilized in aircraft applications because it has good machining characteristics and higher
strength than either 2014 and 2017.
Through cold formability is considered fair, it is one of the most popular alloys for cold
heading and thread rolling applications as a result of the superior grain structure that
can be obtained. Corrosion resistance and anodizeablilty are only fair. It is also the basic
alloy for cold finished square and rectangular bar. Again, this is because of its high strength and good machinability, which are essential for precision
fittings and parts. |
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