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ASTM B308/B308M-20

(Specification)

Standard Specification for Aluminum-Alloy 6061-T6 Standard Structural Profiles

Standard Specification for Aluminum-Alloy 6061-T6 Standard Structural Profiles

ABSTRACT
This specification covers the standard structural profiles for 6061-T6 aluminum-alloy. The profiles are limited to I-beams, H-beams, channels, angles, tees, and zees, which shall be produced by hot extruding only. Chemical composition and tensile properties such as tensile strength, yield strength, and elongation shall conform to the limits herein provided. The determination of chemical composition shall be made in accordance with suitable chemical or spectrochemical methods. Tensile properties shall be tested with test methods for tension testing wrought and cast aluminum- and magnesium-alloy products.
SCOPE
1.1 This specification2 covers extruded 6061-T6 aluminum-alloy standard structural profiles.  
1.2 The profiles are limited to I-beams, H-beams, channels, angles, tees, and zees.  
Note 1: For other extruded profiles in other alloys and tempers refer to Specification B221.  
1.3 Alloy and temper designations are in accordance with ANSI H35.1/H35.1(M). The equivalent Unified Numbering System alloy designation is that in Table 1 preceded by A9, or A96061 for alloy 6061 in accordance with Practice E527.  
1.4 For acceptance criteria for inclusion of new aluminum and aluminum alloys in this specification, see Annex A2.  
1.5 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.  
1.6 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.7 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.

General Information

Status
Published
Publication Date
31-Dec-2019
ICS
77.150.10 - Aluminium products
Technical Committee
B07 - Light Metals and Alloys
Drafting Committee
B07.03 - Aluminum Alloy Wrought Products
Current Stage
Ref Project

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ASTM B308/B308M-20 - Standard Specification for Aluminum-Alloy 6061-T6 Standard Structural ProfilesASTM B308/B308M-20 - Standard Specification for Aluminum-Alloy 6061-T6 Standard Structural Profiles
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ASTM B308/B308M-20 - Standard Specification for Aluminum-Alloy 6061-T6 Standard Structural Profiles
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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.
Designation:B308/B308M −20 Used in USAEC-RDT Standards
Standard Specification for
1
Aluminum-Alloy 6061-T6 Standard Structural Profiles
This standard is issued under the fixed designation B308/B308M; 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 U.S. Department of Defense.
1. Scope* 2. Referenced Documents
2
1.1 This specification covers extruded 6061-T6 aluminum-
2.1 The following documents of the issue in effect on the
alloy standard structural profiles.
dateofmaterialpurchaseformapartofthisspecificationtothe
extent referenced herein:
1.2 The profiles are limited to I-beams, H-beams, channels,
3
angles, tees, and zees.
2.2 ASTM Standards:
B221 Specification forAluminum andAluminum-Alloy Ex-
NOTE1—Forotherextrudedprofilesinotheralloysandtempersreferto
truded Bars, Rods, Wire, Profiles, and Tubes
Specification B221.
B557 Test Methods for Tension Testing Wrought and Cast
1.3 Alloy and temper designations are in accordance with
Aluminum- and Magnesium-Alloy Products
ANSI H35.1/H35.1(M). The equivalent Unified Numbering
B557M Test Methods for Tension Testing Wrought and Cast
System alloy designation is that in Table 1 preceded byA9, or
Aluminum- and Magnesium-Alloy Products (Metric)
A96061 for alloy 6061 in accordance with Practice E527.
B647 Test Method for Indentation Hardness of Aluminum
1.4 For acceptance criteria for inclusion of new aluminum
Alloys by Means of a Webster Hardness Gage
and aluminum alloys in this specification, see Annex A2.
B648 Test Method for Indentation Hardness of Aluminum
Alloys by Means of a Barcol Impressor
1.5 The values stated in either SI units or inch-pound units
B660 Practices for Packaging/Packing of Aluminum and
are to be regarded separately as standard. The values stated in
Magnesium Products
each system may not be exact equivalents; therefore, each
B666/B666M Practice for Identification Marking of Alumi-
system shall be used independently of the other. Combining
num and Magnesium Products
values from the two systems may result in non-conformance
B807/B807M Practice for Extrusion Press Solution Heat
with the standard.
Treatment for Aluminum Alloys
1.6 This standard does not purport to address all of the
B881 Terminology Relating toAluminum- and Magnesium-
safety concerns, if any, associated with its use. It is the
Alloy Products
responsibility of the user of this standard to establish appro-
B918 Practice for Heat Treatment of Wrought Aluminum
priate safety, health, and environmental practices and deter-
Alloys
mine the applicability of regulatory limitations prior to use.
B985 Practice for SamplingAluminum Ingots, Billets, Cast-
1.7 This international standard was developed in accor-
ings and Finished or Semi-Finished Wrought Aluminum
dance with internationally recognized principles on standard-
Products for Compositional Analysis
ization established in the Decision on Principles for the
D3951 Practice for Commercial Packaging
Development of International Standards, Guides and Recom-
E18 Test Methods for Rockwell Hardness of Metallic Ma-
mendations issued by the World Trade Organization Technical
terials
Barriers to Trade (TBT) Committee.
E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
E527 Practice for Numbering Metals and Alloys in the
1
This specification is under the jurisdiction of ASTM Committee B07 on Light
Unified Numbering System (UNS)
Metals and Alloys and is the direct responsibility of Subcommittee B07.03 on
Aluminum Alloy Wrought Products.
Current edition approved Jan. 1, 2020. Published January 2020. Originally
approved in 1956. Last previous edition approved in 2010 as B308/B308M – 10
3
which was withdrawn January 2019 and reinstated January 2020. DOI: 10.1520/ For referenced ASTM standards, visit the ASTM website, www.astm.org, or
B0308_B0308M-20. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
2
For ASME Boiler and Pressure Vessel Code applications see related Specifi- Standards volume information, refer to the standard’s Document Summary page on
cation SB-308 in Section II of that Code. 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

---------------------- Page: 1 ----------------------
B308/B308M−20
NOTE2—Forinch-pou
...

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ABSTRACT
This specification covers aluminum and aluminum-alloy seamless pipe and seamless extruded tube. The pipe and tube shall be produced from hollow extrusion ingot (cast in hollow form, or drilled, or pierced from solid ingot) and shall be extruded by use of the die and mandrel method. The material shall conform to the chemical composition requirements specified. The determination of chemical composition shall be made in accordance with suitable chemical (test methods E 34) or spectrochemical (test methods E 227, E 607, and E 1251) methods. Alloys may be solution heat-treated and quenched at the extrusion press in accordance with practice B 807 for the production of T4 and T6-type tempers, as applicable. The material shall conform to the tensile property requirements specified. The tension tests shall be made in accordance with test methods B 557. The stress-corrosion cracking test shall be performed on extruded tube. The stress-corrosion test shall be made in accordance with test method G 47. The aluminum alloy coating of clad tube shall comprise the inside surface (only) of the tube and its thickness shall be approximately 10 % of the total wall thickness of the tube.
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This specification covers extruded bars, rods, wires, profiles, and tubes made from aluminum and aluminum alloys. All the products should be produced by hot extrusion or similar methods. The chemical composition of each material is determined in accordance with the specified suitable chemical and spectrochemical test methods. 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. Tensile properties, elongation, and yield strengths of each product should conform to the requirements listed herein. Elongation requirements are not applicable for materials with sizes smaller than the specified limits.
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Note 1: Throughout this specification, the use of the term  alloy in the general sense includes aluminum as well as aluminum alloy.
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Note 3: Pipe and tube products listed in this specification are intended for general purpose applications. This specification may not address the manufacturing processes, integrity testing, and verification required for fluid-carrying applications involving pressure. See Specifications B210/B210M or B241/B241M, or both as appropriate, for seamless pipe and tube used in fluid-carrying applications involving pressure. See Specification B234, as appropriate, for use in surface condensers, evaporators, and heat exchangers.  
1.2 Alloy and temper designations are in accordance with ANSI H35.1/H35.1M. The equivalent Unified Numbering System alloy designations are those of Table 1 preceded by A9; for example, A91100 for Aluminum 1100 in accordance with Practice E527.  
1.3 For acceptance criteria for inclusion of new aluminum and aluminum alloys in this specification, see Annex A2.  
1.4 A complete metric companion to Specification B221 has been developed—Specification B221M; therefore, no metric equivalents are presented in this specification.  
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1.1 This specification covers aluminum and aluminum-alloy extruded bars, rods, wires, profiles, and tubes in the aluminum alloys (Note 1) and tempers shown in Table 2.  
Note 1: Throughout this specification the use of the term  alloy  in the general sense includes aluminum as well as aluminum alloy.
Note 2: For rolled or cold-finished bars and rods refer to Specification B211/B211M, for drawn seamless tube used in pressure applications, Specification B210/B210M, for structural pipe and tube, Specification B429/B429M, and for seamless pipe and tube used in pressure applications, Specification B241/B241M.
Note 3: Pipe and tube products listed in this specification are intended for general purpose applications. This specification may not address the manufacturing processes, integrity testing, and verification required for fluid-carrying applications involving pressure. See Specification B210/B210M, B241/B241M, or both as appropriate for seamless pipe and tube used in fluid-carrying applications involving pressure. See Specification B234M, as appropriate, for use in surface condensers, evaporators, and heat exchangers.  
1.2 Alloy and temper designations are in accordance with ANSI H35.1/H35.1M. The equivalent Unified Numbering System alloy designations are those of Table 1 preceded by A9, for example, A91100 for Aluminum 1100 in accordance with Practice E527.  
1.3 For acceptance criteria for inclusion of new aluminum and aluminum alloys in this specification, see Annex A2.  
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This practice is intended for use in the heat treatment of wrought aluminum alloys for general purpose applications. Aluminum alloys are typically heated in air chamber furnaces or molten salt baths. Though lead baths, oil baths, or fluidized beds may be used, uncontrolled heating is not permitted. The furnace temperature uniformity and calibration shall conform to the specified requirements. Preparation for heat treatment of alloys shall follow the racking, spacing, and cleanliness requirements. Solution heat treatment shall follow the recommended soaking times and quenching procedures. Precipitation heat treatment shall conform to the prescribed times, temperatures, and annealing procedures. The alloys shall be subjected to tensile testing, eutectic melting and heat-treat-induced porosity analysis, intergranular corrosion test, and Alclad diffusion test.
SCOPE
1.1 This practice is intended for use in the heat treatment of wrought aluminum alloys for general purpose applications.  
1.1.1 The heat treatment of wrought aluminum alloys used in specific aerospace applications is covered in AMS2772.  
1.1.2 Heat treatment of aluminum alloy castings for general purpose applications is covered in Practice B917/B917M.  
1.2 Times and temperatures appearing in the heat-treatment tables are typical for various forms, sizes, and manufacturing methods and may not provide the optimum heat treatment for a specific item.  
1.3 Some alloys in the 6xxx series may achieve the T4 temper by quenching from within the solution temperature range during or immediately following a hot working process, such as upon emerging from an extrusion die. Such alternatives to furnace heating and immersion quenching are indicated in Table 1, by footnote L, for heat treatment of wrought aluminum alloys. However, this practice does not cover the requirements for a controlled extrusion press or hot rolling mill solution heat treatment; it only covers the requirements of artificial aging, annealing and associated pyrometry of those processes for products solution heat treated in accordance with Practices B807/B807M and B947. (Refer to Practice B807/B807M for extrusion press solution heat treatment of aluminum alloys and to Practice B947 for hot rolling mill solution heat treatment of aluminum alloys and associated pyrometry.)  
1.4 Units—The values stated in either Metric or US Customary 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.  
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