ASTM B951-08
(Practice)Standard Practice for Codification of Unalloyed Magnesium and Magnesium-Alloys, Cast and Wrought
Standard Practice for Codification of Unalloyed Magnesium and Magnesium-Alloys, Cast and Wrought
ABSTRACT
This practice provides a system for the codification of unalloyed magnesium and magnesium alloys in the cast and wrought forms. Code designations shall be based on their chemical composition limits. For alloys, designations shall consist of not more than two letters representing the alloying elements specified in the greatest amount, followed by the respective percentages and a serial letter. The letters that represent the alloying elements are: A for aluminum; C for copper; E for rare earths; J for strontium; K for zirconium; L for lithium; M for manganese; Q for silver; S for silicon; T for tin; V for gadolinium; W for yttrium; and Z for zinc. For unalloyed metals, designations shall consist of the specified minimum purity, followed by a serial letter. For both cases, the full name of the base metal precedes the designation, but is omitted for brevity when the base metal being referred to is obvious.
SCOPE
1.1 This practice provides a system for designating unalloyed magnesium and magnesium-alloys that have been used commercially since 1952, and thus is intended to be the registration source for unalloyed magnesium and magnesium-alloys. A record of designations along with the established compositions is given in Table 2.
1.2 The equivalent Unified Numbering System (UNS) alloy designations shown in the appendixes are in accordance with Practice E 527.
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Designation: B 951 – 08
Standard Practice for
Codification of Unalloyed Magnesium and Magnesium-
1
Alloys, Cast and Wrought
This standard is issued under the fixed designation B 951; 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 B 843 Specification for Magnesium Alloy Anodes for Ca-
thodic Protection
1.1 This practice provides a system for designating unal-
E 527 Practice for Numbering Metals and Alloys in the
loyed magnesium and magnesium-alloys that have been used
Unified Numbering System (UNS)
commercially since 1952, and thus is intended to be the
registration source for unalloyed magnesium and magnesium-
3. Basis of Codification
alloys. A record of designations along with the established
3.1 The designations for alloys and unalloyed metals are
compositions is given in Table 2.
based on their chemical composition limits.
1.2 The equivalent Unified Numbering System (UNS) alloy
designations shown in the appendixes are in accordance with
NOTE 1—For unalloyed magnesium, magnesium-alloys, cast and
Practice E 527. wrought, standard limits for alloying elements and impurities are ex-
pressed to the following places:
2. Referenced Documents
Less than 0.0001 % (used only for magnesium alloys) 0.0000X
0.0001 to 0.001 % 0.000X
2.1 The following documents form a part of this practice to
0.001 to 0.01 % 0.00X
the extent referenced herein:
0.01 to 0.10 %
2
Unalloyed aluminum made by a refining process 0.0XX
2.2 ASTM Standards:
Alloys and unalloyed aluminum or magnesium 0.0X
B80 Specification for Magnesium-Alloy Sand Castings
not made by a refining process
B 90/B 90M Specification for Magnesium-Alloy Sheet and
0.10 through 0.55 % 0.XX
Over 0.55 % 0.X,X.X,XX.X
Plate
B91 Specification for Magnesium-Alloy Forgings
3.2 Designations shall be assigned, revised, and cancelled
B 92/B 92M Specification for Unalloyed Magnesium Ingot
by Subcommittee B07.04 of ASTM Committee B07 on Light
and Stick For Remelting
Metals and Alloys on written requests to its chairman. Com-
B 93/B 93M Specification for Magnesium Alloys in Ingot
plete chemical composition limits shall be submitted with
Form for Sand Castings, Permanent Mold Castings, and
request for assignment or revision of designations. Arbitrary
Die Castings
assignments by other subcommittees or committees will not be
B94 Specification for Magnesium-Alloy Die Castings
recognized.
B 107/B 107M Specification for Magnesium-Alloy Ex-
4. Alloys
truded Bars, Rods, Profiles, Tubes, and Wire
B 199 Specification for Magnesium-Alloy Permanent Mold
4.1 Designationforalloysshallconsistofnotmorethantwo
Castings
letters representing the alloying elements (Note 2) specified in
B 403 Specification for Magnesium-Alloy Investment Cast-
the greatest amount, arranged in order of decreasing percent-
ings
ages, or in alphabetical order if of equal percentages, followed
by the respective percentages rounded off to whole numbers
1
and a serial letter (Notes 3). The full name of the base metal
This practice is under the jurisdiction of ASTM Committee B07 on Light
Metals and Alloys and is the direct responsibility of Subcommittee B07.04 on
precedes the designation, but it is omitted for brevity when the
Magnesium Alloy Cast and Wrought Products.
base metal being referred to is obvious.
Current edition approved March 1, 2008. Published March 2008. Originally
approved in 2007. Last previous edition approved in 2007 as B 951 – 07.
NOTE 2—For codification, an alloying element is defined as an element
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
(other than the base metal) having a minimum content greater than zero
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
either directly specified or computed in accordance with the percentages
Standards volume information, refer to the standard’s Document Summary page on
specified.
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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B951–08
NOTE 3—The serial letter is arbitrarily assigned in alphabetical se-
followed by a 5 only, or a 5 followed only by zeros, the nearest
quencestartingwith“A”(omitting“I”and“O”)andservestodifferentiate
even whole number shall be used.
otherwise identical designations. A serial letter is necessary to complete
4.4 When a range is specified for the alloying element, the
each designation.
rounded mean shall be used in the designation.
4.2 The letters used to represent the greater of the two
4.5 When only a minimum percentage is specified for the
alloy
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:B951–07 Designation: B 951 – 08
Standard Practice for
Codification of Unalloyed Magnesium and Magnesium-
1
Alloys, Cast and Wrought
This standard is issued under the fixed designation B 951; 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
1.1 This practice provides a system for designating unalloyed magnesium and magnesium-alloys that have been used
commercially since 1952, and thus is intended to be the registration source for unalloyed magnesium and magnesium-alloys. A
record of designations along with the established compositions is given in Table 2.
1.2 The equivalent Unified Numbering System (UNS) alloy designations shown in the appendixes are in accordance with
Practice E 527.
2. Referenced Documents
2.1 The following documents form a part of this practice to the extent referenced herein:
2
2.2 ASTM Standards:
B 80 Specification for Magnesium-Alloy Sand Castings
B 90/B 90M Specification for Magnesium-Alloy Sheet and Plate
B 91 Specification for Magnesium-Alloy Forgings
B 92/B 92M Specification for Unalloyed Magnesium Ingot and Stick For Remelting
B 93/B 93M Specification for MagnesiumAlloys in Ingot Form for Sand Castings, Permanent Mold Castings, and Die Castings
B 94 Specification for Magnesium-Alloy Die Castings
B 107/B 107M Specification for Magnesium-Alloy Extruded Bars, Rods, Profiles, Tubes, and Wire
B 199 Specification for Magnesium-Alloy Permanent Mold Castings
B 403 Specification for Magnesium-Alloy Investment Castings
B 843 Specification for Magnesium Alloy Anodes for Cathodic Protection
E 527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
3. Basis of Codification
3.1 The designations for alloys and unalloyed metals are based on their chemical composition limits.
NOTE 1—For unalloyed magnesium, magnesium-alloys, cast and wrought, standard limits for alloying elements and impurities are expressed to the
following places:
Less than 0.0001 % (used only for magnesium alloys) 0.0000X
0.0001 to 0.001 % 0.000X
0.001 to 0.01 % 0.00X
0.01 to 0.10 %
Unalloyed aluminum made by a refining process 0.0XX
Alloys and unalloyed aluminum or magnesium 0.0X
not made by a refining process
0.10 through 0.55 % 0.XX
Over 0.55 % 0.X,X.X,XX.X
3.2 Designations shall be assigned, revised, and cancelled by Subcommittee B07.04 ofASTM Committee B07 on Light Metals
and Alloys on written requests to its chairman. Complete chemical composition limits shall be submitted with request for
assignment or revision of designations. Arbitrary assignments by other subcommittees or committees will not be recognized.
1
This practice is under the jurisdiction ofASTM Committee B07 on Light Metals andAlloys and is the direct responsibility of Subcommittee B07.04 on MagnesiumAlloy
Cast and Wrought Products.
Current edition approved April 15, 2007. Published May 2007.
Current edition approved March 1, 2008. Published March 2008. Originally approved in 2007. Last previous edition approved in 2007 as B 951 – 07.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book ofASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
B951–08
4. Alloys
4.1 Designation for alloys shall consist of not more than two letters representing the alloying elements (Note 2) specified in the
greatest amount, arranged in order of decreasing percentages, or in alphabetical order if of equal percentages, followed by the
respective percentages rounded off to whole numbers and a serial letter (Notes 3 and 4). The full name of the base metal precedes
the designation, but it is omitted for brevity when the base metal being referred to is obvious.
NOTE 2—For codification, an alloying element is defined as an element (other than the base metal) having a minimum content greater than zero either
directly specified or computed in accordance with the percentages specified.
NOTE 3—The serial letter is arbitrarily assigned in alphabetical sequence starting with “A” (omitting “I” and “O”) and serves to differentiate otherwise
identical designations.Aserial letter is
...
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