ASTM B918-01
(Practice)Standard Practice for Heat Treatment of Wrought Aluminum Alloys
Standard Practice for Heat Treatment of Wrought Aluminum Alloys
ABSTRACT
This practice is intended for use in the heat treatment of wrought aluminum alloys for general purpose applications. Aluminum alloys are typically heated in air chamber furnaces or molten salt baths. Though lead baths, oil baths, or fluidized beds may be used, uncontrolled heating is not permitted. The furnace temperature uniformity and calibration shall conform to the specified requirements. Preparation for heat treatment of alloys shall follow the racking, spacing, and cleanliness requirements. Solution heat treatment shall follow the recommended soaking times and quenching procedures. Precipitation heat treatment shall conform to the prescribed times, temperatures, and annealing procedures. The alloys shall be subjected to tensile testing, eutectic melting and heat-treat-induced porosity analysis, intergranular corrosion test, and Alclad diffusion test.
SCOPE
1.1 This practice is intended for use in the heat treatment of wrought aluminum alloys for general purpose applications.
1.1.1 The heat treatment of wrought aluminum alloys used in specific aerospace applications is covered in AMS 2772.
1.1.2 Heat treatment of aluminum alloy castings for general purpose applications is covered in Practice B 917/B 917M.
1.2 Times and temperatures appearing in the heat-treatment tables are typical for various forms, sizes, and manufacturing methods and may not provide the optimum heat treatment for a specific item.
1.3 Some alloys in the 6xxx series may achieve the T4 temper by quenching from within the solution temperature range during or immediately following a hot working process, such as upon emerging from an extrusion die. Such alternatives to furnace heating and immersion quenching are indicated in , by Footnote L, for heat treatment of wrought aluminum alloys. However, this practice does not cover the requirements for a controlled press heat treatment. (Refer to Practice B 807 for press heat treatment of aluminum alloys.)
1.4 This practice is in inch-pound units.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:B918–01
Standard Practice for
1
Heat Treatment of Wrought Aluminum Alloys
This standard is issued under the fixed designation B 918; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
TABLE 1 Tests Required
1. Scope*
Product Tensile Heat-Treat- Intergranular Diffusion Eutectic
1.1 This practice is intended for use in the heat treatment of
A C
Form Properties Induced Corrosion (Alclad Melting
wrought aluminum alloys for general purpose applications. B D
Porosity [Periodic Only) [Periodic
1.1.1 The heat treatment of wrought aluminum alloys used [Periodic Test] [Periodic Test]
2 Test] Test]
in specific aerospace applications is covered in AMS 2772.
E
Plate and XX X XX
1.1.2 Heat treatment of aluminum alloy castings for general
sheet
purpose applications is covered in Practice B 917/B 917M.
Wire, rod, bar, X X X . X
1.2 Times and temperatures appearing in the heat-treatment
and profiles
Forgings X X X . . . X
tables are typical for various forms, sizes, and manufacturing
Tubing X X . . . X X
methods and may not provide the optimum heat treatment for
Rivets, X X X . X
a specific item. fastener
components
1.3 Some alloys in the 6xxx series may achieve the T4
A
Those specified in the applicable procurement material specification for lot
temper by quenching from within the solution temperature
release.
range during or immediately following a hot working process,
B
Applicable only to material solution heat-treated in air furnaces.
C
suchasuponemergingfromanextrusiondie.Suchalternatives
Applicable to the most quench-sensitive alloys-tempers in the following order
of preference: (1) 2xxx in -T3 or -T4 and (2) 7xxx in -T6 temper. No test is required
to furnace heating and immersion quenching are indicated in
if 2xxx-T3 or -T4 or 7xxx-T6, was not solution heat-treated during the period since
Table 2, by Footnote L, for heat treatment of wrought alumi-
the prior verification test.
D
num alloys. However, this practice does not cover the require-
Not applicable for thicknesses less than 0.020 in.
E
Applicable to periodic testing of sheet product only.
ments for a controlled press heat treatment. (Refer to Practice
B 807 for press heat treatment of aluminum alloys.)
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1.4 This practice is in inch-pound units. Magnesium-Alloy Products
1.5 This standard does not purport to address all of the
B 917/B 917M Practice for Heat Treatment of Aluminum-
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safety concerns, if any, associated with its use. It is the Alloy Castings from All Processes
responsibility of the user of this standard to establish appro-
2.3 American National Standard:
priate safety and health practices and determine the applica-
H35.1 Alloy and Temper Designation Systems for Alumi-
4
bility of regulatory limitations prior to use.
num
2. Referenced Documents
3. Terminology
2.1 The following documents, of the issue in effect on the
3.1 Definitions—Refer toTerminology B 881 for definitions
date of material purchase, form a part of this specification to
of product terms used in this practice.
the extent referenced herein:
3.2 Definition of Pyrometry Terms Specific to This Standard:
2.2 ASTM Standards:
3.2.1 control sensor—temperature measurement sensor tied
B 557 Test Methods of Tension Testing Wrought and Cast
to the PID (proportional, integral, and derivative) furnace
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Aluminum- and Magnesium-Alloy Products
controlforcontrollingheatinputtotheworking(soaking)zone
B 881 Terminology Relating to Aluminum- and
of the furnace.
3.2.2 monitoring sensor—a sensor which does not control
the furnace temperature is designated as a monitoring sensor,
1
This practice is under the jurisdiction of ASTM Committee B07 on Light
and includes additional furnace temperature sensor(s) and load
Metals and Alloys and is the direct responsibility of Subcommittee B07.03 on
monitoring sensor(s).
Aluminum Alloy Wrought Products.
Current edition approved July 10, 2001. Published September 2001.
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Available from SAE-AEROSPACE, 400 Commonwealth Drive, Warrendale,
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PA 15096-0001. Available from American National Standards Institute, 25 West 43rd St., 4th
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Annual Book of ASTM Standards, Vol 02.02. Floor, New York, NY 10036.
*ASummary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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B918–01
combustion contact the work, particularly if the gases are high in water
3.2.3 test sensor—temperature measurement sensor(s) used
vapor or contain compounds of sulfur. In general, the high-strength
in furnace temperat
...
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