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ASTM B91-12

(Specification)

Standard Specification for Magnesium-Alloy  Forgings

Standard Specification for Magnesium-Alloy  Forgings

ABSTRACT
This specification covers UNS M11311, M11610, M11800, or M16600 magnesium alloy forgings. The conformance of each material to the required chemical composition can be determined using any suitable method of chemical analysis. Samples for chemical analysis should be taken when the ingots are poured or from the finished or semi-finished products by drilling, sawing, milling, turning, or clipping. The variations in testing speed do not seriously affect the obtained tensile property values. However, care must be exercised so that the testing speed does not exceed the ability of the equipment to function satisfactorily. Unless specified, forgings should be chrome pickled before shipment.
SCOPE
1.1 This specification covers magnesium alloy forgings designated as shown in Table 1.TABLE 1 Chemical Composition LimitsA,BNote 1—Analysis shall regularly be made only for the elements specifically mentioned in this table. If, however, the presence of other elements is suspected or indicated in amounts greater than the specified limits, further analysis shall be made to determine that these elements are not present in excess of the specified limits.Note 2—The following applies to all specified limits in this table. For purposes of acceptance and rejection, an observed value or a calculated value obtained from analysis should be rounded to the nearest unit in the last right-hand place of figures used in expressing the specified limit.    
Composition, %  
Element  
Alloy AZ31B
(UNS No.
M11311)  
Alloy AZ61A
(UNS No.
M11610)  
Alloy AZ80A
(UNS No.
M11800)  
Alloy ZK60A
(UNS No.
M16600)    
Magnesium  
remainder  
remainder  
remainder  
remainder  
Aluminum  
2.5–3.5  
5.8–7.2  
7.8–9.2  
...  
Manganese  
0.20–1.0  
0.15–0.5  
0.12–0.5  
...  
Zinc  
0.6–1.4  
0.40–1.5  
0.20–0.8  
4.8–6.2  
Thorium  
...  
...  
...  
...  
Zirconium, min  
...  
...  
0.45  
Silicon  
0.10  
0.10  
0.10  
...  
Copper  
0.05  
0.05  
0.05  
...  
Nickel  
0.005  
0.005  
0.005  
...  
Iron  
0.005  
0.005  
0.005  
...  
Calcium  
0.04  
...  
...  
...  
Other impuritiesC  
0.30  
0.30  
0.30  
0.30 A Limits are in weight percent maximum unless shown as a range or stated otherwise.B These alloy designations were established in accordance with Practice B951.C Includes listed elements for which no specific limit is shown.  
1.2 The values stated in inch-pound units are the standard. The SI values in parentheses are provided for information only.

General Information

Status
Historical
Publication Date
31-Oct-2012
ICS
77.150.20 - Magnesium products
Technical Committee
B07 - Light Metals and Alloys
Drafting Committee
B07.04 - Magnesium Alloy Cast and Wrought Products
Current Stage
Ref Project

Relations

Replaces
ASTM B91-07 - Standard Specification for Magnesium-Alloy Forgings
Effective Date
01-Nov-2012
Replaced By
ASTM B91-17 - Standard Specification for Magnesium-Alloy Forgings
Effective Date
01-May-2017
Referred By
ASTM B951-11(2018) - Standard Practice for Codification of Unalloyed Magnesium and Magnesium-Alloys, Cast and Wrought
Effective Date
01-Nov-2012
Referred By
ASTM B881-17 - Standard Terminology Relating to Aluminum- and Magnesium-Alloy Products
Effective Date
01-Nov-2012

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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:B91 −12
Standard Specification for
1
Magnesium-Alloy Forgings
This standard is issued under the fixed designation B91; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) 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* 2.4 Military Standards:
3
MIL-STD-129 Marking for Shipment and Storage
1.1 This specification covers magnesium alloy forgings
4
designated as shown in Table 1. 2.5 Aerospace Materials Specification:
AMS-M-3171 MagnesiumAlloy, Processes for Pretreatment
1.2 The values stated in inch-pound units are the standard.
and Prevention of Corrosion on
TheSIvaluesinparenthesesareprovidedforinformationonly.
3. Terminology
2. Referenced Documents
3.1 Definitions:
2.1 The following documents of the issue in effect on date
3.1.1 forging—a metal part worked to a predetermined
of material purchase form a part of this specification to the
shape by one or more such processes as hammering, upsetting,
extent referenced herein:
pressing, or rolling.
2
2.2 ASTM Standards:
3.1.2 die forging—a forging formed to the required shape
B557 Test Methods for Tension Testing Wrought and Cast
and size by working in impression dies.
Aluminum- and Magnesium-Alloy Products
B660 Practices for Packaging/Packing of Aluminum and
3.1.3 hammer forging—a forging produced by repeated
Magnesium Products
blows in a forging hammer.
B951 PracticeforCodificationofUnalloyedMagnesiumand
3.1.4 hand forging—a forging worked between flat or sim-
Magnesium-Alloys, Cast and Wrought
ply shaped dies by repeated strokes or blows and manipulation
B953 Practice for Sampling Magnesium and Magnesium
of the piece.
Alloys for Spectrochemical Analysis
B954 Test Method for Analysis of Magnesium and Magne-
4. Ordering Information
sium Alloys by Atomic Emission Spectrometry
4.1 Orders for forgings under this specification shall include
E29 Practice for Using Significant Digits in Test Data to
the following information:
Determine Conformance with Specifications
E55 Practice for Sampling Wrought Nonferrous Metals and 4.1.1 Quantity of each forging,
Alloys for Determination of Chemical Composition 4.1.2 Alloy (Section 6 and Table 1),
4.1.3 Temper (Section 7 and Table 2),
2.3 Federal Standards:
3
No. 123 Marking for Shipment (Civil Agencies) 4.1.4 Drawing showing dimensions of all die forgings and
for all hand forgings not simple disks, rounds, squares, or
No. 184 Identification Marking of Aluminum, Magnesium,
and Titanium. rectangles (the amount of stock left for machine finish should
be indicated),
4.1.5 Surface treatment (see 9.1),
1
This specification is under the jurisdiction of ASTM Committee B07 on Light
4.1.6 Whether inspection is required at the manufacturer’s
Metals and Alloys and is the direct responsibility of Subcommittee B07.04 on
works (see 10.1),
Magnesium Alloy Cast and Wrought Products.
4.1.7 Special inspection requirements (see 10.2),
Current edition approved Nov. 1, 2012. Published November 2012. Originally
approved in 1932. Last previous edition approved in 2007 as B91 – 07. DOI:
4.1.8 Whether certification is required (see 12.1), and
10.1520/B0091-12.
4.1.9 Whether marking for identification is required (see
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
13.1).
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
4
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:// Available from SAE International (SAE), 400 Commonwealth Dr.,Warrendale,
www.dodssp.daps.mil. PA 15096-0001, http://www.sae.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B91−12
A,B
TABLE 1 Chemical Composition Limits
NOTE 1—Analysis shall regularly be made only for the elements specifically mentioned in this table. If, however, the presence of other elements is
suspectedorindicatedinamountsgreaterthanthespecifiedlimits,furtheranalysisshallbemadetodeterminethattheseelementsarenotpresentinexcess
of the specified limits.
NOTE 2—The following applies to all specified limits in this table. For purposes of acceptance and rejection, an observed value or a calculated value
obtained from analysis should be rounded to the nearest unit in the last right-hand place of figures used in expressing the specified limit.
Composition, %
All
...

Designation: B91 − 07 B91 − 12
Standard Specification for
1
Magnesium-Alloy Forgings
This standard is issued under the fixed designation B91; 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 Department of Defense.
1. Scope Scope*
1.1 This specification covers magnesium alloy forgings designated as shown in Table 1.
1.2 The values stated in inch-pound units are the standard. The SI values in parentheses are provided for information only.
2. Referenced Documents
2.1 The following documents of the issue in effect on date of material purchase form a part of this specification to the extent
referenced herein:
2
2.2 ASTM Standards:
B557 Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products
B660 Practices for Packaging/Packing of Aluminum and Magnesium Products
B951 Practice for Codification of Unalloyed Magnesium and Magnesium-Alloys, Cast and Wrought
B953 Practice for Sampling Magnesium and Magnesium Alloys for Spectrochemical Analysis
B954 Test Method for Analysis of Magnesium and Magnesium Alloys by Atomic Emission Spectrometry
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
3
E35 Test Methods for Chemical Analysis of Magnesium and Magnesium Alloys (Withdrawn 2008)
E55 Practice for Sampling Wrought Nonferrous Metals and Alloys for Determination of Chemical Composition
2.3 Federal Standards:
3
No. 123 Marking for Shipment (Civil Agencies)
No. 184 Identification Marking of Aluminum, Magnesium, and Titanium.
2.4 Military Standards:
3
MIL-STD-129 Marking for Shipment and Storage
4
2.5 Military Standards:Aerospace Materials Specification:
MIL-M-3171AMS-M-3171 Magnesium Alloy, Processes for Pretreatment and Prevention of Corrosion on
4
MIL-STD-129 Marking for Shipment and Storage
3. Terminology
3.1 Definitions:
3.1.1 forging—a metal part worked to a predetermined shape by one or more such processes as hammering, upsetting, pressing,
or rolling.
3.1.2 die forging—a forging formed to the required shape and size by working in impression dies.
3.1.3 hammer forging—a forging produced by repeated blows in a forging hammer.
3.1.4 hand forging—a forging worked between flat or simply shaped dies by repeated strokes or blows and manipulation of the
piece.
4. Ordering Information
4.1 Orders for forgings under this specification shall include the following information:
4.1.1 Quantity of each forging,
4.1.2 Alloy (Section 6 and Table 1),
4.1.3 Temper (Section 7 and Table 2),
4.1.4 Drawing showing dimensions of all die forgings and for all hand forgings not simple disks, rounds, squares, or rectangles
(the amount of stock left for machine finish should be indicated),
4.1.5 Surface treatment (see 9.1),
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B91 − 12
A,B
TABLE 1 Chemical Composition Limits
NOTE 1—Analysis shall regularly be made only for the elements specifically mentioned in this table. If, however, the presence of other elements is
suspected or indicated in amounts greater than the specified limits, further analysis shall be made to determine that these elements are not present in excess
of the specified limits.
NOTE 2—The following applies to all specified limits in this table. For purposes of acceptance and rejection, an observed value or a calculated value
obtained from analysis should be rounded to the nearest unit in the last right-hand place of figures used in expressing the specified limit.
Composition, %
Alloy AZ31B Alloy AZ61A Alloy AZ80A Alloy ZK60A
Element (UNS No. (UNS No. (UNS No. (UNS No.
M11311) M11610) M11800) M16600)
Magnesium remainder remainder remainder remainder
Aluminum 2.5–3.5 5.8–7.2 7.8–9.2 .
Manganese 0.20–1.0 0.15–0.5 0.12–0.5 .
Zinc 0.6–1.4 0.40–1.5 0.20–0.8 4.8–6.2
Thorium . . . .
Zirconium, min . . 0.45
Silicon 0.10 0.10 0.10 .
Copper 0.05 0.05 0.05 .
Nickel 0.005 0.005 0.005 .
Iron 0.005 0.005 0.005 .
Calcium 0.04 . . .
C
Other impurities 0.30 0.30 0.30 0.30
A
Limits are in weight percent maximum unless shown as a range or stated otherwise.
B
These alloy designations were established in accordance with Practice B951.
C
Includes listed elements for which no specific limit is shown.
TABLE 2 Tensile Requirements
NOTE 1—For purposes of determining conformance with this
specification, each value for tensile strength and yield strength shall be
rounded to the nearest 0.1 ksi (0.7 MPa) and each value for elongation
shall be rounded to the nearest 0.5 %, both in accordance with the
rounding method of Pract
...

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ASTM
ASTM B92/B92M-17(Specification)
Standard Specification for Unalloyed Magnesium Ingot and Stick For Remelting

ABSTRACT
This specification covers the standard for magnesium alloys in ingot and stick forms proposed for used in remelting. Magnesium 9980A alloys are available in ingot and stick form. Magnesium 9980B, 9990A, 9995A, and 9998A, on the other hand, are generally available in ingot form only. The specimens shall be produced with no slag and shall have a clean surface free from dirt, slag, or other foreign contaminants. Alloys shall adhere to specified chemical composition requirements. Any suitable chemical analysis method can be used unless otherwise prescribed.
SCOPE
1.1 This specification covers magnesium in the form of ingot and stick for remelting: 9980A is available in ingot and stick form, and 9980B, 9990A, 9995A, and 9998A are generally available only in ingot form.  
1.2 The values stated in SI units are to be regarded as a separate standard. The values stated in each system are not exact equivalents, therefore each system must be used independently of the other.  
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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  • Technical specification
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