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AERONAUTICAL MATERIAL SPECIFICATIOH AMS 4260

Society of Automotive En~ineers, Inc.
29 wa~ 3s~h sae~t ,u~~ 3-i-55
New York City R~~;.~d
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~« ALUMINUM ALIAY CA5TINGS, PRFCISION INVES7.MENT
~E8e 7si - o.3Mg (356-Tb)
o~~; Solution and Precipitation 7`reated
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~g>~ 1. ACKNOWLED(~~IENT: A vendor shall mention this specification number in all
a_~e quotations and when aclmowledging purchase orders.
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~~;_ 2. APPLICATION: Primarily for small and intricate parts cast to approximately
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~ final imensions.
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o$E~ 3. COMPOSITION: Castings shall conform to the following:
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Silicon 6.5 - ?.5
~~~E Ma~esiwn 0.20 - O.I~J
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a e o.. Iron 0.50 max
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Manganese 0.30 max
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A~r~ Zin c 0.30 max
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Copper 0.20 max
~o~~ Titanium 0.20 max
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Other Impurities, each 0.05'max
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Other Impurities, total 0.15 max
~ Aluminum remainder
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,~ !t. CONDITION: Solution and precipitation heat treated.
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S~on 5. TECIIIVICAL REQUIP,EMENfS s
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5.1 Castings Castings shall be ~oured either from remelted master heat metal or
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=~w~ irec f`rom a master heat. A master heat is refined metal of a single fur-
<Ya~ nace charge. Crates, sprues, risers, and re~ec+ed castings shall be used or~y
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o~« in prenaration of mast°r heats; they shall not be remelted directly, without
w?~ — e ref~.ning~ for pouring of castings. Ladle additions of small amounts of grain
v~~a refining elements or alloys are permissible.
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00 5.2 Test Snecime~s;
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o•~ 5.2.1 Tensile Test Snecimenss Unless othex~ise snecified~ tensile test specimens
oa„~ s a e cast represent each lot of castings and~ When requested~ shall
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a be supplied with the castings. A lot shall consist of not more than S00 lb of
~c « cast metal (including gates, sprues~ and risers} produced in a neriod of not
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~a~r more than 8 consecutive hr f~om a single master heat. The snecimens shall be
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of standard proportions with 0.25 in. diameter at the reduced parallel eec-
tion~ shall be cast to size in molds made of the aame ret'ractory and heated
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o°c.°.~ to the same temperature as the molds for castings~ and shall be cooled at
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W`r apnrox3mate~y the same rate as the castings. If the metal for castings is
o~c~ given ar~ treatanent such as fluxing or cooling and reheating~ metal for the
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specimens shall be so treated.
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5.2.2 Chemical Ana~ysis Specimens: When required by purchaser, shall be of size and
s iape a~gree3 unon ~c~ser and vendor.

Copyrlsht 1 7~~ ey aonlety of Automotlra Enelneers. Ine. Print~d In U. 5. A.

 Downloaded from SAE International by Sharon Navot, Tuesday, May 19, 2015

A M s 4260 - 2-

5.3 Heat ~eatments A1Z castings and tensile test specimens representing them s
~e _ heat trea d as fo].lows s
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5.3.1 Tensile test specimens fram each heat, ~ogether with production castings,
shall be heated to the proper t~nperature and for the proper time for solutio
treatment.and.quenched at a rate not faster than that produced by immersion i
water which is boiling at the time of immersian. At least one set of tensile
test specimens sha11 be put into a batch type f~rnace with each load of
castings or into a conti.nuous furnace at intervals of not longer than 3 hours
5.3.2 Tensile test s pecimens f~om each heat~ together Kith production castings~
shall~ after solution heat treatment as in 5.3.1~ be heated uni.formly to
not lower than 300 F~ held at heat for not less than 1.5 hr~ and cooled in
air. At least one set of tensi:le test snecimens shall be put into a batch-
type flirnace with each load of castings or into a continuous furnace at
intervals of not longer than 3 hours.
5.~ 'I~ensile Propertiesr
5.~.1 Tensile Test Specimenss
Tensile Strength~ psi 33,000 min
Yield Strength at 0.2~ Offset or at 0.00l~1 in.
in 1 in. Extension IInder Load (E ~ 10~300~000), psi 22~000 rain
Elongation~ % in 1 in. 3.0 min
5.1~.2 Tensile Pro rties of Castingss When tensile properties of actual castings
are eterm ne or accep aa~ce~ not less than !~~ and preferab~y 10~ tensile
~
test spec~nens shal7. be cu~ from thick and thin sections. T he average value
of all specimens selected shall confo nn to the following:

Tensile Strength~ psi 21~, 750 mix

Yield Strength at 0.2~ Offset or at 0.0036 in.
in 1 in. F~ctension Under IAad (E ~ 10~300~000~~ psi 16~500 min
Elongation~ ~ in laD 0.7 min
5.1~.2.1 Conformance to these requirements may be used as basis for acceptance of
castings. ~

5.5 Hardness of Cas~.ingss Fxcept at sprues and risers~ the castings shall have
r ess o Roc 1 B 27-60 or equ:i.valent.
6. QUAISPY s

6.1 Castings shall be uniform in quality and condition~ sound~ and free from foreig
materials and from internal arid external defects detrimental to fabrication or
to nerforcnance of parts. Castings shall ha.ve smooth surfaces and shall be well
cleaned.
6.2 Radiographic and other quality standards shall be as agreed upon by purchaser
and vendor.
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 Downloaded from SAE International by Sharon Navot, Tuesday, May 19, 2015

-3-
~ 6.3 Unless otherwise s~ecified~ castings shall be produced under radiographic con-
trol. This shall consist of radiographic examination of castings until proper
foundry technique~ which will prodnce castings free from harmful internal
defects, is established for each part number, and of nroduction castings as
necessary to ensure.maintenance of satisfactor,y quality.

6.l~ Castings shall not be reuaired"by plugging~ ~,relding~ or other methods, without
~rritten ner~aission fro~a purchaser.

6.~ Castings shall not be impregnated, chemicaL~y treated, or coated to prevent

leaking~ unless specified or allowed by~written nermission Whieh states the
method to be used. Impregriated castings shall be. marked IM'P.
7. RE?oRTS:
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7.1 Unless otherwise snecified, the vendor of castings shall furnish Nith each
shipment three copies of a report of the results of tests for chemical compo-
sition of at least one cas~ing from each master heat represented~ and a statement
that the castings confor~ to the requirements of this specification. This
report shall include the murchase order number, master heat number (and code
sY~bol ig used)~ material specification nwnber~ part number~ and quantity from
each heat.

7.2 Unle~s otherwise snecified~ the vendor of finished or semi-finished parts shall
furnish with each shipment three copies of a report showing the purchase order

~ number~ material snecification number~ contractor or other direct supplier of

castings, part number~ and quantity. When castings for making parts are pro-
duced or purchased by the parts vendor, that'vendor shall inspect castings ~om
each master heat represented to determine confoxmance to the requirements of
this specification, and shall i~clude in the report a statement that the cast-
ings conform, or shall include copies of laboratory re ports showing the results
of tests to determine conformance.

8. IDENPIFICA TIONs. Unless otherwise specified~ each casting sha11 be plainly mark~
with he ~art nwnber, master heat rn.unber~ and lot number. Marking materiala sha:
have no deleterious effects on tY~ castings or their performanceo
9. A~PROVAL:

9.1 To assure uniformity of quality, sample castings from new or reworked master pa
terns shall be anproved by purchaser~ unless such approval be waived,

9.2 Vendor shall use the same casting technique~ including rate of cooling after
casting~ and the same heat treating procediu~e for production castings as for
approved sample castings. If necessary to make a~y change~ vendor shall ziotifyr
purchaser prior to the first shiFxnent of castings incorporating such change.

10. REJEGTIONSt Castings not conforming to this specification or to authorized

mo i ica ons wi~l be subject to re3ection.