ASTM B275-96

Standard Practice for Codification of Certain Nonferrous Metals and Alloys, Cast and Wrought

SCOPE
1.1 This practice covers a system originally adopted for designating light metals and alloys, cast and wrought, and later extended to certain heavier, base-metal die-casting alloys. Those designations which are currently being used in specifications under the jurisdiction of Committees B02 on Nonferrous Metals and Alloys and B07 on Light Metals and Alloys are listed in Table X2.1.
1.1.1 The alloy designations now being used in Committee B07 specifications for aluminum and aluminum-alloy wrought and cast products conform to ANSI H35.1. Alloys formerly codified by this practice and the corresponding ANSI designations are shown in Tables X3.1 and X3.2.
1.2 This practice also provides a system for designating magnesium alloys that has been used commercially since 1952, and thus is intended to be the registration source for new magnesium alloys. A record of designations along with the established compositions is given in Table X4.1.
1.3 The equivalent Unified Numbering System alloy designations shown in the appendixes are in accordance with Practice E 527.

General Information

• Status: Historical
• Publication Date: 09-Apr-2002
• ICS: 77.150.01 - Products of non-ferrous metals in general
• Technical Committee: B07 - Light Metals and Alloys
• Drafting Committee: B07.03 - Aluminum Alloy Wrought Products

Relations

• Replaced By: ASTM B275-02 - Standard Practice for Codification of Certain Nonferrous Metals and Alloys, Cast and Wrought
• Effective Date: 10-Apr-2002
• Referred By: ASTM B26/B26M-18e1 - Standard Specification for Aluminum-Alloy Sand Castings
• Effective Date: 10-Apr-2002
• Referred By: ASTM B240-22 - Standard Specification for Zinc and Zinc-Aluminum (ZA) Alloys in Ingot Form for Foundry and Die Castings
• Effective Date: 10-Apr-2002
• Referred By: ASTM B327-21 - Standard Specification for Master Alloys Used in Making Zinc Die Casting Alloys
• Effective Date: 10-Apr-2002
• Referred By: ASTM B969/B969M-18e1 - Standard Specification for Aluminum-Alloy Castings Produced by Squeeze Casting, and the Semi-Solid Thixocast and Rheocast Casting Processes
• Effective Date: 10-Apr-2002
• Referred By: ASTM B955/B955M-18 - Standard Specification for Aluminum-Alloy Centrifugal Castings
• Effective Date: 10-Apr-2002
• Referred By: ASTM B908-22 - Standard Practice for the Use of Color Codes for Zinc Casting Alloy Ingot
• Effective Date: 10-Apr-2002
• Referred By: ASTM B917/B917M-12(2020) - Standard Practice for Heat Treatment of Aluminum-Alloy Castings From All Processes
• Effective Date: 10-Apr-2002
• Referred By: ASTM B86-22 - Standard Specification for Zinc and Zinc-Aluminum (ZA) Alloy Foundry and Die Castings
• Effective Date: 10-Apr-2002
• Referred By: ASTM B85/B85M-18e1 - Standard Specification for Aluminum-Alloy Die Castings
• Effective Date: 10-Apr-2002
• Referred By: ASTM B618/B618M-18e1 - Standard Specification for Aluminum-Alloy Investment Castings
• Effective Date: 10-Apr-2002
• Referred By: ASTM B108/B108M-19 - Standard Specification for Aluminum-Alloy Permanent Mold Castings
• Effective Date: 10-Apr-2002
• Referred By: ASTM B686/B686M-18 - Standard Specification for Aluminum Alloy Castings, High-Strength
• Effective Date: 10-Apr-2002

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: B 275 – 96 An American National Standard
Standard Practice for
Codification of Certain Nonferrous Metals and Alloys, Cast
and Wrought
This standard is issued under the fixed designation B 275; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope * B 240 Specification for Zinc Alloys in Ingot Form for Die
Castings
1.1 This practice covers a system originally adopted for
B 327 Specification for Aluminum-Alloy Hardeners Used
designating light metals and alloys, cast and wrought, and later
in Making Zinc Die-Casting Alloys
extended to certain heavier, base-metal die-casting alloys.
E 527 Practice for Numbering Metals and Alloys (UNS)
Those designations which are currently being used in specifi-
2.3 ANSI Standard:
cations under the jurisdiction of ASTM Committees B-2 on
H35.1 Alloy and Temper Designation Systems for Alumi-
Nonferrous Metals and Alloys and B-7 on Light Metals and
num
Alloys are listed in Table X2.1.
1.1.1 The alloy designations now being used in ASTM
3. Basis of Codification
Committee B-7 specifications for aluminum and aluminum-
3.1 The designations for alloys and unalloyed metals are
alloy wrought and cast products conform to ANSI H35.1.
based on their chemical composition limits.
Alloys formerly codified by this practice and the corresponding
ANSI designations are shown in Tables X3.1 and X3.2.
NOTE 1—For aluminum and magnesium alloys, cast and wrought,
1.2 This practice also provides a system for designating standard limits for alloying elements and impurities are expressed to the
following places:
magnesium alloys that has been used commercially since 1952,
Less than 0.0001 % (used only for magnesium alloys) 0.0000X
and thus is intended to be the registration source for new
0.0001 to 0.001 % 0.000X
magnesium alloys. A record of designations along with the
0.001 to 0.01 % 0.00X
established compositions is given in Table X4.1.
0.01 to 0.10 %
Unalloyed aluminum made by a refining process 0.0XX
1.3 The equivalent Unified Numbering System alloy desig-
Alloys and unalloyed aluminum or magnesium not made by 0.0X
nations shown in the appendixes are in accordance with
a refining process
Practice E 527.
0.10 through 0.55 % 0.XX
Over 0.55 % 0.X,X.X,XX.X
2. Referenced Documents
3.2 Designations shall be assigned, revised, and cancelled
2.1 The following documents of the issue in effect on date
by Subcommittee B07.07 of ASTM Committee B-7 on Light
of material purchase form a part of this practice to the extent
Metals and Alloys on written requests to its chairman. Com-
referenced herein:
plete chemical composition limits shall be submitted with
2.2 ASTM Standards:
request for assignment or revision of designations. Arbitrary
B 37 Specification for Aluminum for Use in Iron and Steel
assignments by other subcommittees or committees will not be
Manufacture
recognized.
B 86 Specification for Zinc-Alloy Die Castings
3.3 The temper designation, which is used for all metal
B 93/B93M Specification for Magnesium Alloys in Ingot
forms except ingot, follows the alloy designation and is
Form for Sand Castings, Permanent Mold Castings, and
separated therefrom by a dash.
Die Castings
4. Alloys
B 94 Specification for Magnesium-Alloy Die Castings
B 102 Specification for Lead and Tin Alloy Die Castings
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 percent-
1 ages, or in alphabetical order if of equal percentages, followed
This practice is under the jurisdiction of ASTM Committee B07 on Light
by the respective percentages rounded off to whole numbers
Metals and Alloys and is the direct responsibility of Subcommittee B07.03 on
Aluminum Alloy Wrought Products.
and a serial letter (Notes 3 and 4). The full name of the base
Current edition approved Aug. 10, 1996. Published September 1996. Originally
published as B 275 – 62 T. Last previous edition B 275 – 95a.
Annual Book of ASTM Standards, Vol 02.02.
3 4
Annual Book of ASTM Standards, Vol 02.04. Annual Book of ASTM Standards, Vol 01.01.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
B 275
TABLE 1 Letters Representing Alloying Elements
metal precedes the designation, but it is omitted for brevity
when the base metal being referred to is obvious. A—Aluminum M—Manganese
B—Bismuth N—Nickel
NOTE 2—For codification, an alloying element is defined as an element
C—Copper P—Lead
D—Cadmium Q—Silver
(other than the base metal) having a minimum content greater than zero
E—Rare earths R—Chromium
either directly specified or computed in accordance with the percentages
F—Iron S—Silicon
specified.
G—Magnesium T—Tin
NOTE 3—The serial letter is arbitrarily assigned in alphabetical se-
H—Thorium W—Yttrium
quence starting with “A” (omitting “I” and “O”) and serves to differentiate
K—Zirconium Y—Antimony
otherwise identical designations. A serial letter is necessary to complete L—Lithium Z—Zinc
each designation.
NOTE 4—The designation of a casting alloy in ingot form is derived
from the composition specified for the corresponding alloy in the form of
castings. Thus, a casting ingot designation may consist of an alloy
5. Unalloyed Metals
designation having one or more serial letters, one for each product
composition, or it may consist of one or more alloy designations.
5.1 Designations for unalloyed metals consist of the speci-
4.2 The letters used to represent alloying elements shall be fied minimum purity, all digits retained but dropping the
those in Table 1.
decimal point, followed by a serial letter (Note 3). The full
4.3 In rounding percentages, the nearest whole number shall
name of the base metal precedes the designation, but it is
be used. If two choices are possible as when the decimal is
omitted for brevity when the base metal being referred to is
followed by a 5 only, or a 5 followed only by zeros, the nearest
obvious.
even whole number shall be used.
4.4 When a range is specified for the alloying element, the
6. Keywords
rounded mean shall be used in the designation.
6.1 aluminum; lead; magnesium; tin; UNS designations;
4.5 When only a minimum percentage is specified for the
zinc
alloying element, the rounded minimum percentage shall be
used in the designation.
APPENDIXES
(Nonmandatory Information)
X1. EXAMPLES OF CODIFICATION
X1.1 Example 1—For Alloy CG181A in Specification the alloying element specified in the second greatest amount;“
B 327, “C” represents copper, the alloying element specified in
9” indicates that the rounded mean aluminum percentage lies
the greatest amount; “G” represents magnesium, the alloying
between 8.6 and 9.4; “1” signifies that the rounded mean of the
element specified in the second greatest amount; 18 indicates
zinc lies between 0.6 and 1.4; and “A” as the final letter
that the rounded mean copper percentage lies between 17 and
indicates that this is the first alloy whose composition qualified
19; 1 signifies the nearest whole number for magnesium
assignment of the designation AZ91. The final serial letters B
percentage; and “A” as the final letter indicates that this is the
and C signify alloys subsequently developed whose specified
first alloy qualified and assigned under the designation CG181.
compositions differ slightly from the first and from one another
but do not differ sufficiently to effect a change in the basic
X1.2 Example 2—For Alloys AZ91A, B, and C, in Speci-
designation.
fication B 93/B 93M, “A” represents aluminum, the alloying
element specified in the greatest amount; “Z” represents zinc,
X2. DESIGNATIONS FOR METALS AND ALLOYS ASSIGNED IN CONFORMANCE WITH PRACTICE B 275, FOR
CODIFICATION OF CERTAIN NONFERROUS METALS AND ALLOYS
X2.1 Designations for metals and alloys assigned in con-
formance with Practice B 275, and the ASTM specifications in
which they are used, are shown in Table X2.1.
B 275
TABLE X2.1 Designations Assigned for Nonferrous Metals and
Alloys in Conformance with Practice B 275
Designation ASTM Specifications
ASTM B275 UNS B 37 B 102 B 86 B 240 B 327
Aluminum Alloy
850A * . . . .
900A * . . . .
920A * . . . .
950A * . . . .
980A * . . . .
990A * . . . .
CG181A . . . . *
G1C . . . . *
ZG71A . . . . *
Lead Alloy
Y10A . * . . .
YT155A . * . . .
Tin Alloy
CY44A . * . . .
PY1815A . * . . .
YC135A . * . . .
Zinc Alloy
AC41A Z35531 . . * . .
AG40A Z35520 . . * . .
AC41A Z35530 . . . * .
AG40A Z33521 . . . * .
AC43A Z35541 . . * . .
AG40B Z33523 . . * . .
AC43A Z35540 . . . * .
AG40B Z33522 . . . * .
* Alloys appear in applicable specifications which are found in the Annual Book
of ASTM Standards, Vol 02.02.
X3. DESIGNATIONS FOR METALS AND ALLOYS FORMERLY ASSIGNED IN CONFORMANCE WITH B 275
X3.1 Designations assigned in conformance with this dard Alloys and Temper Designation Systemsfor Aluminum
practice were used for wrought aluminum and wrought alumi- (ANSI H35.1) are standard with the Unified Numbering
num alloys in ASTM specifications prior to 1960 and for cast System, E 527 for information only. The former ASTM desig-
nations and the corresponding ANSI and UNS designations for
aluminum and aluminum alloys and ingot prior to 1974 but
wrought alloys are as shown in Table X3.1. Cast alloys and
now designations conforming to the American National Stan-
ingot are as shown in Table X3.2.
TABLE X3.1 Wrought Aluminum Alloys
Designations Designations
Former Former
ANSI H35.1 UNS ANSI H35.1 UNS
B275–63 B275–63
1060 996A A91060 5056 GM50A A95056
1100 990A A91100 5083 GM41A A95083
2011 CB60A A92011 5086 GM40A A95086
2014 CS41A A92014 5154 GR40A A95154
2017 CM41A A92017 5254 GR40B A95254
2018 CN42C A92018 5454 GM31A A95454
2024 CG42A A92024 5456 GM51A A95456
2117 CG30A A92117 5652 GR20B A95652
3003 M1A A93003 6053 GS11B A96053
3004 MG11A A93004 6061 GS11A A96061
4032 SG121
...