Cast Aluminum Alloy Designation System

The designation system for cast aluminum alloys is similar in some respects to that for wrought alloys but has a few very important differences as noted by the following description.
Like the wrought alloy system, the cast alloy designation system also has four digits but differs from the wrought alloy system in that a decimal point is used between the third and fourth digits to make clear that these are designations to identify alloys in the form of castings or foundry ingot.
As for the wrought alloy designation system, the various digits of the cast alloy system convey information about the alloy:
66 Aluminum Alloys
Table 2 Nominal Compositions of Wrought Aluminum Alloya
Alloy
Percent of Alloying Elementsb
Silicon Copper Manganese Magnesium Chromium Nickel Zinc Titanium Notesc
1060 — — — — — — — — 1
1100 — — — — — — — — 1
1145 — — — — — — — — 1
1350 — — — — — — — — 2
2008 0.65 0.9 — 0.38 — — — — 3
2010 — 1.0 0.25 0.7 — — — —
2011 — 5.5 — — — — — — 4
2014 0.8 4.4 0.8 0.50 — — — —
2017 0.50 4.0 0.7 0.6 — — — —
2024 — 4.4 0.6 1.5 — — —
2025 0.8 4.4 0.8 — — —
2036 — 2.6 0.25 0.45 — — — —
2117 — 2.6 — 0.35 — — — —
2124 — 4.4 0.6 1.5 — — — — 5
2195 — 4.0 — 0.50 — — — — 5
2219 — 6.3 0.30 — — — — 0.06 7
2319 — 6.3 0.30 — — — — 0.15 7
2618 0.18 2.3 — 1.6 — 1 — 0.07 8
3003 — .12 1.2 — — — — —
3004 — — 1.2 1 — — — —
3005 — — 1.2 0.40 — — — —
3105 — — 0.6 0.50 — — — —
4032 12.2 0.9 — — — — 0.9 —
4043 5.2 — — — — — — —
4643 4.1 — — 0.20 — — — —
5005 — — — 0.8 — — — —
5050 — — — 1.4 — — — —
5052 — — — 2.5 0.25 — — —
5056 — — 0.12 5.0 0.12 — — —
5083 — — 0.7 4.4 0.15 — — —
5086 — — 0.45 4.0 0.15 — — —
5154 — — — 3.5 0.25 — — —
5183 — — 0.8 4.8 0.15 — — —
5356 — — 0.12 5.0 0.12 — — 0.13
5454 — — 0.8 2.7 0.12 — — —
5456 — — 0.8 5.1 0.12 — — —
5457 — — 0.30 1.0 — — — —
5554 — — 0.8 2.7 0.12 — — 0.12
5556 — — 0.8 5.1 0.12 — — 0.12
5657 — — — 0.8 — — — —
5754 — — 0.5 3.1 0.3 — — —
6005 0.8 — — 0.50 — — — —
6009 — — — — — — — —
6013 0.8 0.8 0.50 1.0 — — — —
6053 0.7 — — 1.2 0.25 — — —
6061 0.6 0.28 — 1.0 0.20 — — —
6063 0.40 — — 0.7 — — — —
3 Designation Systems 67
Table 2 (Continued)
Alloy
Percent of Alloying Elementsb
Silicon Copper Manganese Magnesium Chromium Nickel Zinc Titanium Notesc
6066 1.4 1.0 0.8 1.1 — — — —
6070 1.4 0.28 0.7 0.8 — — — —
6101 0.50 — — 0.6 — — — —
6111 0.85 0.7 0.28 0.75 — — — —
6151 0.9 — — 0.6 0.25 — — —
6201 0.7 — — 0.8 — — — —
6262 0.6 0.28 1.0 0.09 9
6351 1.0 — 0.6 0.6 — — — —
6951 0.35 0.28 — 0.6 — — — —
7005 — — 0.45 1.4 0.13 — 4.5 0.04 10
7049 — 1.6 — 2.4 0.16 — 7.7 —
7050 — 2.3 — 2.2 — — 6.2 — 11
7072 — — — — — — 1.0 —
7075 — 1.6 — 2.5 0.23 — 5.6 —
7116 — 0.8 — 1.1 — — 4.7 — 12
7129 — 0.7 — 1.6 — — 4.7 — 12
7175 — 1.6 — 2.5 0.23 — 5.6 — 5
7178 — 2.0 — 2.8 0.23 — 6.8 —
7475 — 1.6 — 2.2 0.22 — 5.7 — 5
8017 — 0.15 — 0.03 — — — — 13
8090 — 1.3 — 0.95 — — — — 14
8176 0.09 — — — — — — — 13
a Based on industry handbooks.2,3 Consult those references for specified limits. Values are nominal, i.e., middle range
of limits for elements for which a composition range is specified.
bAluminum and normal impurities constitute remainder.
c 1. Percent minimum aluminum—for 1060: 99.60%; for 1100: 99.00%; for 1145: 99.45%; for 1350: 99.50%. Also,
for 1100, 0.12% iron.
2. Formerly designated EC.
3. Also contains 0.05% vanadium (max.).
4. Also contains 0.40% lead and 0.4% bismuth.
5. This alloy has tighter limits on impurities than does its companion alloy (2024 or 7075).
6. Also contains 1.0% lithium, 0.42% silver, and 0.12% zirconium.
7. Also contains 0.10% vanadium plus 0.18% zirconium.
8. Also contains 1.1% iron.
9. Also contains 0.55% lead and 0.55% bismuth.
10. Also contains 0.14% zirconium.
11. Also contains 0.12% zirconium.
12. Also contains 0.05% max. vanadium plus 0.03% max. gallium.
13. Also contains 0.7% iron.
14. Also contains 2.4% lithium plus 0.10% zirconium.
• The first digit indicates the alloy group, as can be seen in Table 3. For 2xx.x through
8xx.x alloys, the alloy group is determined by the alloying element present in the
greatest mean percentage, except in cases in which the composition being registered
qualifies as a modification of a previously registered alloy. Note that in Table 3 the
6xx.x series is shown last and for cast alloys is designated as the unused series.
• The second and third digits identify the specific aluminum alloy or, for the aluminum
1xx.x series, indicate purity. If the greatest mean percentage is common to more than
68 Aluminum Alloys
Table 3 Cast Alloy Designation System
Alloy Main Alloying Element
1xx.x Pure aluminum, 99.00% maximum
2xx.x Copper
3xx.x Silicon, with added copper and/or magnesium
4xx.x Silicon
5xx.x Magnesium
7xx.x Zinc
8xx.x Tin
9xx.x Other elements
6xx.x Unused series
one alloying element, the alloy group is determined by the element that comes first
in sequence. For the 1xx.x group, the second two of the four digits in the designation
indicate the minimum aluminum percentage. These digits are the same as the two
digits to the right of the decimal point in the minimum aluminum percentage when
expressed to the nearest 0.01%.
• The fourth digit indicates the product form: xxx.0 indicates castings and xxx.1 for the
most part indicates ingot having limits for alloying elements the same as those for the
alloy in the form of castings. A fourth digit of xxx.2 may be used to indicate that the
ingot has composition limits that differ from but fall within the xxx.1 limits; this
typically represents the use of tighter limits on certain impurities to achieve specific
properties in the cast product produced from that ingot.
• A letter before the numerical designation indicates a modification of the original alloy
or an impurity limit. These serial letters are assigned in alphabetical sequence starting
with A, but omitting I, O, Q, and X, with X being reserved for experimental alloys.
Note that explicit rules have been established for determining whether a proposed
composition is a modification of an existing alloy or if it is a new alloy.
Experimental alloys of either the wrought or cast series are indicated by the addition of
the prefix X. The prefix is dropped when the alloy is no longer experimental. However,
during development and before an alloy is designated as experimental, a new composition
may be identified by a serial number assigned by the originator. Use of the serial number is
discontinued when the composition is registered with the Aluminum Association and the
ANSI H35.1 designation is assigned.
The compositions of a representative group of widely used commercial cast aluminum
alloys are given in Table 4, from Standards for Aluminum Sand and Permanent Mold Castings3
and other aluminum casting industry publications.5,8–10

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J. G. Kaufman
Kaufman Associates
Columbus, Ohio

Mechanical Engineers’ Handbook: Materials and Mechanical Design, Volume 1, Third Edition.
Edited by Myer Kutz
Copyright  2006 by John Wiley & Sons, Inc.





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