Heat treating and inspection of metals Page: 34
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TX 1-423
34-37 AIR CORPS
d. Annealing.-The annealing temperature is between 6400 and 660
F. and cooling from the annealing temperature is accomplished in still
air.
e. Hardening.-The hardening treatment is identical with that de-
scribed for alloy 17S.
35. Alloy 24S.-a. Composition.-This material is composed of
92 percent aluminum, 0.3 to 0.90 percent manganese, 1.25 to 1.75 per-
cent magnesium, and 3.80 to 4.90 percent copper.
b. Properties.-The ultimate tensile strength of this material is
26,000 pounds per square inch and the yield point 10,000 pounds per
square inch when in the annealed condition. These values raise to
65,000 and 43,000, respectively, when heat-treated for maximum hard-
ness and to 68,000 and 53,000, respectively, when cold worked while
in the heat-treated condition.
c. Uses.-This material is used in a similar manner to 17S alloy and
is rapidly superseding it in many instances, due to its higher yield
point.
d. Annealing.-The annealing temperature is between 650 and 800
F. and cooling is accomplished in still air.
e. Hardening.-The hardening treatment is accomplished as follows:
(1) Heat to 915-930 F.
(2) Hold at this temperature as prescribed in table VI.
(3) Quench in cold water.
(4) Age at room temperature for 24 hours.
36. Alloy 24S Alclad.-a. Compositio.-The composition of
this alloy is identical with that of 24S alloy and, as in the case of 17S
Alclad, the only difference lies in the protective coating of pure
aluminum.
b. Properties.-The ultimate tensile strength of this material is
60,000 pounds per square inch and the yield point 40,000 pounds per
square inch when in the heat-treated and aged condition. These values
may be raised to 62,000 and 49.000, respectively, by cold working after
heat treatment.
c. Uses.-As in the case of 17S alloy this material is used in assemblies
subjected to corrosion.
d. Annealing.-The annealing temperature is from 640 to 660 F.
and cooling is accomplished in still air.
e. Hardening.-The hardening treatment is identical with that
described for alloy 24S.
37. Alloy 25S.-a. Composition.-This material is composed of
92 percent aluminum, 0.4 to 1.2 percent manganese, 0.02 percent
(maximum) magnesium, 3.9 to 5.0 percent copper and 0.5 to 1.2 percent
silicon.
34
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United States. War Department. Heat treating and inspection of metals, book, September 10, 1941; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc96657/m1/36/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.