ASTM B296-96
(Practice)Standard Practice for Temper Designations of Magnesium Alloys, Cast and Wrought
Standard Practice for Temper Designations of Magnesium Alloys, Cast and Wrought
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 B-7 for magnesium alloy castings and wrought products, conform to this practice.
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Designation: B 296 – 96
Standard Practice for
Temper Designations of Magnesium Alloys, Cast and
Wrought
This standard is issued under the fixed designation B 296; 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.
1. Scope 2.2 The temper designation follows the alloy designation,
the two being separated by a dash.
1.1 This practice covers a system for designating the tem-
2.3 Basic temper designations consist of letters. Subdivi-
pers of magnesium alloys, cast and wrought. The designations
sions of the basic tempers, where required, are indicated by a
used in ASTM specifications under the jurisdiction of Com-
digit or digits following the letter. These designate specific
mittee B-7 for magnesium alloy castings and wrought prod-
sequences of basic treatments, but only operations recognized
ucts, conform to this practice.
as significantly influencing the characteristics of the product
2. Basis of Codification
are indicated. Should some other variation of the same se-
quence of basic operations be applied to the same alloy,
2.1 The designations for temper are used for all forms of
resulting in different characteristics, then additional digits are
magnesium and magnesium-alloy products except ingots and
added to the designation.
are based on the sequence of basic treatments used to produce
the various tempers.
NOTE 1—In material specifications containing reference to two or more
tempers of the same alloy which result in identical mechanical properties,
the distinction between the tempers should be covered in suitable
This practice is under the jurisdiction of the ASTM Committee B-7 on Light
explanatory notes.
Metals and Alloys and is the direct responsibility of Subcommittee B07.04 on
Magnesium Alloy Cast and Wrought Products.
2.4 The temper designations and the subdivisions are fully
Current edition approved April 10, 1996. Published June 1996. Originally
defined and explained in Table 1. A brief outline for quick
published as B 296 – 54. Last previous edition B 296 – 67 (1990).
reference is given in Table 2.
The designations used in ASTM Committee B-7 specifications for aluminum-
alloy wrought and cast products conform to the American National Standard H 35.1.
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NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
B 296
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. The H is always followed by two or more digits.
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); etc.
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 indicate a specific degree of control of temper or specified mechanical property limits.
W Solution Heat-Trated—An unstable temper applicable only to alloys which spontaneously age at room temperature after s
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