ASTM B686/B686M-08
(Specification)Standard Specification for Aluminum Alloy Castings, High-Strength
Standard Specification for Aluminum Alloy Castings, High-Strength
ABSTRACT
This specification covers aluminum-alloy high-strength castings. These castings are intended for use in airframe, missile, and other critical applications where high-strength, ductility, and sound castings are required. Castings are classified according to inspection and radiographic quality. Classes 1, 2, 3, and 4 and Grades A, B, C, and D, respectively. Chemical composition of the castings shall be within the limits specified. Heat treatment shall be performed on a whole casting and never on a portion only. The dimensions of the castings shall be within the dimensions and tolerances specified on the applicable drawing. The inspection and testing of castings shall be classified as: preproduction tests and quality-conformance tests. Spectrochemical analysis, radiographic inspection, tensile test, and liquid penetrant inspection shall be made to conform to the requirements specified.
SCOPE
1.1 This specification covers aluminum-alloy high-strength castings designated as shown in Table 1.
1.2 Castings covered by this specification are intended for use in airframe, missile, and other critical applications where high strength, ductility, and sound castings are required.
1.3 Alloy and temper designations are in accordance with ANSI H35.1/H35.1 (M). The equivalent Unified Numbering System alloy designations are in accordance with Practice E 527.
1.4 Unless the order specifies the “M” specification designation, the material shall be furnished to the inch-pound units.
1.5 For acceptance criteria for inclusion of new aluminum and aluminum alloys and their properties in this specification, see Annex A1 and Annex A2.
1.6 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regular limitations prior to use.
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Designation: B686/B686M – 08
Standard Specification for
1
Aluminum Alloy Castings, High-Strength
This standard is issued under the fixed designation B686/B686M; 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* Molten Forms for Castings from All Casting Processes
B275 Practice for Codification of Certain Nonferrous Met-
1.1 This specification covers aluminum-alloy high-strength
als and Alloys, Cast and Wrought
castings designated as shown in Table 1.
B557 Test Methods for Tension Testing Wrought and Cast
1.2 Castings covered by this specification are intended for
Aluminum- and Magnesium-Alloy Products
use in airframe, missile, and other critical applications where
B557M TestMethodsforTensionTestingWroughtandCast
high strength, ductility, and sound castings are required.
Aluminum- and Magnesium-Alloy Products (Metric)
1.3 Alloy and temper designations are in accordance with
B660 Practices for Packaging/Packing of Aluminum and
ANSI H35.1/H35.1 (M). The equivalent Unified Numbering
Magnesium Products
System alloy designations are in accordance with Practice
B881 TerminologyRelatingtoAluminum-andMagnesium-
E527.
Alloy Products
1.4 Unless the order specifies the “M” specification desig-
B917/B917M Practice for Heat Treatment of Aluminum-
nation, the material shall be furnished to the inch-pound units.
Alloy Castings from All Processes
1.5 For acceptance criteria for inclusion of new aluminum
D3951 Practice for Commercial Packaging
and aluminum alloys and their properties in this specification,
E29 Practice for Using Significant Digits in Test Data to
see Annex A1 and Annex A2.
Determine Conformance with Specifications
1.6 Units—The values stated in either SI units or inch-
E34 Test Methods for ChemicalAnalysis ofAluminum and
pound units are to be regarded separately as standard. The
Aluminum-Base Alloys
values stated in each system may not be exact equivalents;
E94 Guide for Radiographic Examination
therefore,eachsystemshallbeusedindependentlyoftheother.
E155 Reference Radiographs for Inspection of Aluminum
Combining values from the two systems may result in non-
and Magnesium Castings
conformance with the standard.
E165 PracticeforLiquidPenetrantExaminationforGeneral
1.7 This standard does not purport to address all of the
Industry
safety concerns, if any, associated with its use. It is the
E527 Practice for Numbering Metals and Alloys in the
responsibility of the user of this standard to establish appro-
Unified Numbering System (UNS)
priate safety and health practices and determine the applica-
E607 Test Method for Atomic Emission Spectrometric
bility of regular limitations prior to use.
Analysis Aluminum Alloys by the Point to Plane Tech-
2. Referenced Documents
nique Nitrogen Atmosphere
E716 Practices for Sampling Aluminum and Aluminum
2.1 The following documents of the issue in effect on the
Alloys for Spectrochemical Analysis
date of purchase form a part of this specification to the extent
E1251 Test Method for Analysis of Aluminum and Alumi-
referenced herein:
2
num Alloys by Atomic Emission Spectrometry
2.2 ASTM Standards:
IEEE/ASTM SI 10 Standard for Use of the International
B179 Specification for Aluminum Alloys in Ingot and
System of Units (SI): The Modern Metric System
3
2.3 AMS Standard:
AMS 2771 Heat Treatment of Aluminum Alloy Castings
1
This specification is under the jurisdiction of ASTM Committee B07 on Light
4
2.4 ANSI Standards:
Metals and Alloys and is the direct responsibility of Subcommittee B07.01 on
H35.1 / H35.1 (M) – 2006 Alloy and Temper Designation
Aluminum Alloy Ingots and Castings.
Current edition approved May 1, 2008. Published June 2008. Originally
approved in 1981. Last previous edition approved in 2007 as B686/B686M – 07.
DOI: 10.1520/B0686_B0686M-08.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from Society of Automotive Engineers (SAE), 400 Commonwealth
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Dr., Warrendale, PA 15096-0001, http://www.sae.org.
4
Standards volume information, refer to the standard’s Document Summary page on Available from Aluminum Association, Inc., 1525 Wilson Blvd., Suite 600,
the ASTM website. Arlington, VA 22209, http://www.aluminum.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.
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B686/B686M – 08
TABL
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This document is not anASTM standard and is intended only to provide the user of anASTM 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:B686/B686M–07 Designation: B 686/B 686M – 08
Standard Specification for
1
Aluminum Alloy Castings, High-Strength
This standard is issued under the fixed designation B 686/B 686M; 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*
1.1 This specification covers aluminum-alloy high-strength castings designated as shown in Table 1.
1.2 Castings covered by this specification are intended for use in airframe, missile, and other critical applications where high
strength, ductility, and sound castings are required.
1.3 Alloy and temper designations are in accordance withANSI H35.1/H35.1 (M). The equivalent Unified Numbering System
alloy designations are in accordance with Practice E 527.
1.4 Unless the order specifies the “M” specification designation, the material shall be furnished to the inch-pound units.
1.5 For acceptance criteria for inclusion of new aluminum and aluminum alloys and their properties in this specification, see
Annex A1 and Annex A2.
1.6 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated
in each system may not be exact equivalents,; therefore, each system shall be used independently of the other. Combining values
from the two systems may result in non-conformance with the standard.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regular
limitations prior to use.
2. Referenced Documents
2.1 The following documents of the issue in effect on the date of purchase form a part of this specification to the extent
referenced herein:
2
2.2 ASTM Standards:
B 179 Specification for Aluminum Alloys in Ingot and Molten Forms for Castings from All Casting Processes
B 275 Practice for Codification of Certain Nonferrous Metals and Alloys, Cast and Wrought
B 557 Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products
B 557M Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products (Metric)
B 660 Practices for Packaging/Packing of Aluminum and Magnesium Products
B 881 Terminology Relating to Aluminum- and Magnesium-Alloy Products
B 917/B 917M Practice for Heat Treatment of Aluminum-Alloy Castings from All Processes
D 3951 Practice for Commercial Packaging
E 29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E 34 Test Methods for Chemical Analysis of Aluminum and Aluminum-Base Alloys E88Practice for Sampling Nonferrous
Metals and Alloys in Cast Form for
Determination of Chemical Composi-
tion
E 94 Guide for Radiographic Examination
E 155 Reference Radiographs for Inspection of Aluminum and Magnesium Castings
E 165 Test Method for Liquid Penetrant Examination
E 527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
1
This specification is under the jurisdiction ofASTM Committee B07 on Light Metals andAlloys and is the direct responsibility of Subcommittee B07.01 onAluminum
Alloy Ingots and Castings.
Current edition approved Oct.May 1, 2007.2008. Published October 2007.June 2008. Originally approved in 1981. Last previous edition approved in 20032007 as
B 686/B 686M – 037.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
*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
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B 686/B 686M – 08
TABLE 1 Chemical Composition Limits
NOTE 1—When single units are shown, they indicate the maximum amounts permitted.
NOTE 2—Analysis shall be made for the elements for which limits are shown in this table.
NOTE 3—The following applies to all specified limits in this table: For purposes of determining conformance to these limits, an observed value or a
calculated value obtained from
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