ASTM B951-07

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Designation: B 951 – 07
Standard Practice for
Codification of Unalloyed Magnesium and Magnesium-
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 (UNS)
loyed magnesium and magnesium-alloys that have been used
commercially since 1952, and thus is intended to be the
3. Basis of Codification
registration source for unalloyed magnesium and magnesium-
3.1 The designations for alloys and unalloyed metals are
alloys. A record of designations along with the established
based on their chemical composition limits.
compositions is given in Table 2.
1.2 The equivalent Unified Numbering System (UNS) alloy
NOTE 1—For unalloyed magnesium, magnesium-alloys, cast and
designations shown in the appendixes are in accordance with wrought, standard limits for alloying elements and impurities are ex-
pressed to the following places:
Practice E 527.
Less than 0.0001 % (used only for magnesium alloys) 0.0000X
0.0001 to 0.001 % 0.000X
2. Referenced Documents
0.001 to 0.01 % 0.00X
2.1 The following documents form a part of this practice to
0.01 to 0.10 %
Unalloyed aluminum made by a refining process 0.0XX
the extent referenced herein:
Alloys and unalloyed aluminum or magnesium 0.0X
2.2 ASTM Standards:
not made by a refining process
B80 Specification for Magnesium-Alloy Sand Castings
0.10 through 0.55 % 0.XX
Over 0.55 % 0.X,X.X,XX.X
B 90/B 90M Specification for Magnesium-Alloy Sheet and
Plate
3.2 Designations shall be assigned, revised, and cancelled
B91 Specification for Magnesium-Alloy Forgings
by Subcommittee B07.04 of ASTM Committee B07 on Light
B 92/B 92M Specification for Unalloyed Magnesium Ingot
Metals and Alloys on written requests to its chairman. Com-
and Stick For Remelting
plete chemical composition limits shall be submitted with
B 93/B 93M Specification for Magnesium Alloys in Ingot
request for assignment or revision of designations. Arbitrary
Form for Sand Castings, Permanent Mold Castings, and
assignments by other subcommittees or committees will not be
Die Castings
recognized.
B94 Specification for Magnesium-Alloy Die Castings
4. Alloys
B 107/B 107M Specification for Magnesium-Alloy Ex-
truded Bars, Rods, Profiles, Tubes, and Wire
4.1 Designationforalloysshallconsistofnotmorethantwo
B 199 Specification for Magnesium-Alloy Permanent Mold
letters representing the alloying elements (Note 2) specified in
Castings
the greatest amount, arranged in order of decreasing percent-
B 403 Specification for Magnesium-Alloy Investment Cast-
ages, or in alphabetical order if of equal percentages, followed
ings
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
This practice is under the jurisdiction of ASTM Committee B07 on Light
when the base metal being referred to is obvious.
Metals and Alloys and is the direct responsibility of Subcommittee B07.04 on
Magnesium Alloy Cast and Wrought Products.
NOTE 2—For codification, an alloying element is defined as an element
Current edition approved April 15, 2007. Published May 2007.
(other than the base metal) having a minimum content greater than zero
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
either directly specified or computed in accordance with the percentages
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
specified.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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B951–07
NOTE 3—The serial letter is arbitrarily assigned in alphabetical se-
4.3 In rounding percentages, the nearest whole number shall
quencestartingwith“A”(omitting“I”and“O”)andservestodifferentiate
be used. If two choices are possible as when the decimal is
otherwise identical designations. A serial letter is necessary to complete
followed by a 5 only, or a 5 followed only by zeros, the nearest
each designation.
even whole number shall be used.
NOTE 4—The designation of a casting alloy in ingot form is derived
4.4 When a range is specified for the alloying element, the
from the composition specified for the corresponding alloy in the form of
rounded mean shall be used in the designation.
castings. Thus, a casting ingot designation may consist of an alloy
designation having one or more serial letters, one for each product 4.5 When only a minimum percentage is specified for the
composition, or it may consist of one or more alloy designations.
alloying element, the rounded minimum percentage shall be
used in the designation.
4.2 The letters used to represent the greater of the two
alloying elements shall be those in Table 1.
5. Unalloyed Metals
5.1 Designations for unalloyed metals consist of the speci-
fied minimum purity, all digits retained but dropping the
TABLE 1 Letters Representing Alloying Elements
decimal point, followed by a serial letter (Note 3). The full
A—Aluminum Q—Silver
name of the base metal precedes the designation, but it is
C—Copper S—Silicon
E—Rare earths T—Tin omitted for brevity when the base metal being referred to is
J—Strontium V—Gadolinium
obvious.
K—Zirconium W—Yttrium
L—Lithium Z—Zinc
6. Keywords
M—Manganese
6.1 magnesium; UNS designations
B951–07
TABLE 2 Unalloyed Magnesium and Magnesium-Alloy Registration
(A Registration Record of Magnesium Alloys with Established Designations and Chemical Composition)
NOTE—Cast or wrought product compositions may differ from casting ingot compositions.
Designation Chemical Composition, % max unless shown as a range or as a min
Other Elements
See
Practice UNS
ASTM
Specific Each Total
9980A M19980 B 92 99.80 0.02 0.10 0.001 0.01 Sn 0.05
min 0.01 Pb
0.006 Na
9980B M19991 B 92 99.80 0.02 0.10 0.005 0.01 Sn 0.05
min 0.01 Pb
A
9990A M19990 B 92 99.90 0.003 0.04 0.004 0.001 0.005 0.00007 B 0.01
A
min 0.0001 Cd
9995A M19995 B 92 99.95 0.01 0.003 0.004 0.001 0.005 0.01 Ti 0.005
A
min 0.00003 B
A
0.0001 Cd
9998A M19998 B 92 99.98 0.004 0.0005 0.002 0.002 0.0005 0.003 0.001 Ti 0.005
min 0.00005 Cd
0.00003 B
0.001 Pb
B C D D
AJ52A M17520 B94 4.5-5.5 0.010 0.004 0.24-0.6 0.001 0.10 1.7-2.3 0.22 0.01
B C D D
AJ62A M177620 B94 5.5-6.6 0.010 0.04 0.24-0.6 0.001 0.10 2.0-2.8 0.22 0.01
C D D
AM50A M10500 B94 4.4-5.4 0.010 0.004 0.26-0.6 0.002 0.10 0.22 0.02
C
AM60A M10600 B94 5.5-6.5 0.35 0.13-0.6 0.03 0.50 0.22 0.0
C D D
AM60B M10602 5.5-6.5 0.010 0.005 0.24-0.6 0.002 0.10 0.22 0.02
C
AM100A M10100 B80 9.3-10.7 0.10 0.10-0.35 0.01 0.30 0.30 0.0
B 199
B 403
C
AM100A M10101 B 93 9.4-10.6 0.08 0.13-0.35 0.01 0.20 0.20 0.0
C
AS21A M10210 B94 1.8-2.5 0.01 0.005 0.18-0.7 0.001 0.7-1.2 0.20 0.01
B C
AS21B M10212 B94 1.8-2.5 0.008 0.0035 0.05-0.15 0.001 0.06-0.25 0.7-1.2 0.25 0.01
C
AS41A M10410 B94 3.5-5.0 0.06 0.20-0.50 0.03 0.50-1.5 0.12
C D D
AS41B M10412 B94 3.5-0.7 0.02 0.0035 0.35-0.7 0.002 0.50-1.5 0.12 0.02
C
AZ31B M11311 B 90 2.5-3.5 0.04 0.05 0.005 0.20-1.0 0.005 0.10 0.6-1.4 0.0
B91
B 107
B 843
C E
AZ31C M11312 B 107 2.4-3.6 0.10 0.15-1.0 0.03 0.10 0.50-1.5 0.0
C
AZ31D M11313 B 843 2.5-3.5 0.04 0.04 0.002 0.20-1.0 0.0010 0.05 0.6-1.4 0.01 0.0
C
AZ61A M11610 B91 5.8-7.2 0.05 0.005 0.15-0.5 0.005 0.10 0.40-1.5 0.0
B 107
C
AZ63A M11630 B80 5.3-6.7 0.25 0.15-0.35 0.01 0.30 2.5-3.5 0.0
C
AZ63A M11631 B 93 5.5-6.5 0.20 0.15-0.35 0.010 0.20 2.7-3.3 0.0
C
AZ63B M11632 B 843 5.3-6.7 0.02 0.003 0.15-0.7 0.002 0.10 2.5-3.5 0.0
C
AZ63C M11634 B 843 5.3-6.7 0.05 0.003 0.15-0.7 0.003 0.30 2.5-3.5 0.0
C
AZ63D M11636 B 843 5.0-7.0 0.10 0.003 0.15-0.7 0.003 0.30 2.0-4.0 0.0
C
AZ80A M11800 B91 7.8-9.2 0.05 0.005 0.12-0.5 0.005 0.10 0.20-0.8 0.0
B 107
C
AZ
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