ASTM B296-03(2014)
(Practice)Standard Practice for Temper Designations of Magnesium Alloys, Cast and Wrought
Standard Practice for Temper Designations of Magnesium Alloys, Cast and Wrought
ABSTRACT
This practice covers a system for designating the tempers of magnesium alloys, cast and wrought. The designations for temper are used for all forms of magnesium and magnesium-alloy products except ingots and are based on the sequence of basic treatments used to produce the various tempers. The temper designation follows the alloy designation, the two being separated by a dash.
SCOPE
1.1 This practice covers a system for designating the tempers of magnesium alloys, cast and wrought. The designations used in ASTM specifications under the jurisdiction of Committee B07 for magnesium alloy castings and wrought products conform to this practice.2
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B296 − 03 (Reapproved 2014)
Standard Practice for
Temper Designations of Magnesium Alloys, Cast and
Wrought
This standard is issued under the fixed designation B296; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope 2. Basis of Codification
2.1 The designations for temper are used for all forms of
1.1 This practice covers a system for designating the tem-
magnesium and magnesium-alloy products except ingots and
pers of magnesium alloys, cast and wrought. The designations
are based on the sequence of basic treatments used to produce
used in ASTM specifications under the jurisdiction of Com-
the various tempers.
mittee B07 for magnesium alloy castings and wrought products
2.2 The temper designation follows the alloy designation,
conform to this practice.
the two being separated by a dash.
1.2 This international standard was developed in accor-
2.3 Basic temper designations consist of letters. Subdivi-
dance with internationally recognized principles on standard-
sions of the basic tempers, where required, are indicated by a
ization established in the Decision on Principles for the
digit or digits following the letter. These designate specific
Development of International Standards, Guides and Recom-
sequences of basic treatments, but only operations recognized
mendations issued by the World Trade Organization Technical
as significantly influencing the characteristics of the product
Barriers to Trade (TBT) Committee.
are indicated. Should some other variation of the same se-
quence of basic operations be applied to the same alloy,
resulting in different characteristics, then additional digits are
This practice is under the jurisdiction of the ASTM Committee B07 on Light
added to the designation.
Metals and Alloys and is the direct responsibility of Subcommittee B07.04 on
Magnesium Alloy Cast and Wrought Products. NOTE 1—In material specifications containing reference to two or more
Current edition approved May 1, 2014. Published June 2014. Originally tempers of the same alloy which result in identical mechanical properties,
approved in 1954. Last previous edition approved in 2008 as B296 – 03 (2008).
the distinction between the tempers should be covered in suitable
DOI: 10.1520/B0296-03R14.
explanatory notes.
The designations used in ASTM Committee B07 specifications for aluminum-
2.4 The temper designations and the subdivisions are fully
alloy wrought and cast products conform to the American National Standard
H 35.1 ⁄H 35.1(M). defined and explained in Table 1. A brief outline for quick
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
B296 − 03 (Reapproved 2014)
reference is given in Table 2.
B296 − 03 (2014)
TABLE 1 Temper Designations
F As Fabricated —Applies to products that acquire some temper from shaping processes not having special control over the amount of strain hardening
or thermal treatment.
O Annealed, Recrystallized—Applies to the softest temper of wrought products.
H Strain Hardened (Wrought Products Only)—Applies to products that have their strength increased by strain hardening with or without supplementary
thermal treatments to produce partial softening. Two or more digits always follow the H.
Subdivisions of the 9H9 Temper:
H1 Strain Hardened Only—Applies to products that are strain hardened to obtain the desired mechanical properties without supplementary thermal
treatment. The number following this designation indicates the final degree of strain hardening.
H2 Strain Hardened and Then Partially Annealed—Applies to products that are strain hardened more than the desired final amount and then reduced in
strength to the desired final amount by partial annealing.
The number following this designation indicates the final degree of strain hardening remaining after the product has been partially annealed.
H3 Strain Hardened and Then Stabilized—Applies to products that are strain hardened and then stabilized by a low temperature heating to slightly lower
their strength and increase ductility. This designation applies only to alloys which, unless stabilized, gradually age soften at room temperature.
The number following this designation indicates the degree of strain hardening remaining after the product has been strain hardened a specific
amount and then stabilized.
Subdivisions of the 9H1,99H2,9 and 9H39 Tempers:
The digit following the designations 9H1,99H2,9 and 9H39 indicates the final degree of strain hardening. Tempers between 0 (annealed) and 8 (full hard)
are designated by numerals 1 through 7. Material having a strength about midway between that of the 0 temper and that of the 8 temper is designated by the
numeral 4 (half hard); between 0 and 4 by the numeral 2 (quarter hard); between 4 and 8 by the numeral 6 (three-quarter hard); and so forth.
The third digit, when used, indicates a variation of a two-digit H temper. It is used when the degree of control of temper or the mechanical properties
are different from but close to those for the two-digit H temper to which it is added. Numerals 1 through 9 may be arbitrarily assigned for an alloy and product
to indicat
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.