ASTM B308/B308M-20

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
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
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,
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
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
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
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
B308/B308M−20
NOTE2—Forinch-poundordersspecifyB308;formetricordersspecify
E607 Test Method for Atomic Emission Spectrometric
B308M. Do not mix units.
Analysis Aluminum Alloys by the Point to Plane Tech-
nique Nitrogen Atmosphere (Withdrawn 2011)
4.1.2 Quantity in pieces or pounds [kilograms],
E716 Practices for Sampling and Sample Preparation of
4.1.3 Alloy (Section 8),
Aluminum and Aluminum Alloys for Determination of
4.1.4 Temper (10.1 and Table 2),
Chemical Composition by Spark Atomic Emission Spec-
4.1.5 Typeofsection(1.2),dimensions(includingadrawing
trometry
if necessary), and length,
E1251 Test Method for Analysis of Aluminum and Alumi-
4.2 Additionally, orders for material to this specification
num Alloys by Spark Atomic Emission Spectrometry
shall include the following information when required by the
E3061 Test Method for Analysis of Aluminum and Alumi-
purchaser:
numAlloys by Inductively Coupled PlasmaAtomic Emis-
4.2.1 Whether solution heat treatment at the extrusion press
sion Spectrometry (Performance Based Method)
is unacceptable (9.2),
2.3 ANSI Standards:
4.2.2 Whether heat treatment in accordance with Practice
H35.1/H35.1(M) AlloyandTemperDesignationSystemsfor
B918 is required (9.3),
Aluminum
4.2.3 Whether inspection or witness of inspection and tests
H35.2 Dimensional Tolerances for Aluminum Mill Prod-
by the purchaser’s representative is required prior to material
ucts
shipment (Section 13),
H35.2(M) Dimensional Tolerances for Aluminum Mill
4.2.4 Whether certification of the material by the supplier is
Products (Metric)
required (Section 15),
2.4 Federal Standard:
4.2.5 Whether marking for identification is required (16.1),
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
and
2.5 AMS Specifications:
4.2.6 Whether Practices B660 applies and, if so, the appli-
AMS 2772 Heat Treatment of Aluminum Alloy/Raw Mate-
cable levels of preservation, packaging, and packing required
rials
(17.3).Table 2
2.6 Military Specifications:
MIL-STD-129 Marking for Shipment and Storage
5. Materials and Manufacture
2.7 CEN EN Standards:
EN14242 Aluminumandaluminumalloys,Chemicalanaly-
5.1 The products covered by this specification shall be
sis inductively coupled plasma optical emission spectral
produced by hot extruding only.
analysis.
3. Terminology
3.1 Definitions—Refer to Terminology B881 for definitions A,B,C,F
TABLE 1 Chemical Composition Limits
of product terms used in this specification.
Alloy 6061 Composition, %
3.2 Definitions of Terms Specific to This Standard: Silicon 0.40–0.8
Iron 0.7
3.2.1 inspection lot—an identifiable quantity of material of
Copper 0.15–0.40
the same mill form, alloy, temper, and nominal dimensions
Manganese 0.15
Magnesium 0.8–1.2
traceable to a heat-treat lot of lots, subjected to inspection at
Chromium 0.04–0.35
one time (see 14.1).
Zinc 0.25
3.2.2 heat-treat lot—an identifiable quantity of material
Titanium 0.15
D
heat-treated in the same furnace at the same time (see 10.2.1 Other elements each 0.05
E
Total 0.15
and 10.2.2).
Aluminum rem
A
Where single units are shown, these indicate the maximum amounts permitted.
4. Ordering Information
B
Analysis shall be made for the elements for which limits are shown in this table.
C
For purposes of determining conformance to these limits, an observed value or
4.1 Orders for material to this specification shall include the
a calculated value obtained from analysis shall be rounded to the nearest unit in
following information:
the last right-hand place of figures used in expressing the specified limit, in
4.1.1 This specification designation (which includes the
accordance with the rounding-off method of Practice E29.
D
Others includes all unlisted metallic elements. The producer may analyze
number, the year, and the revision letter, if applicable),
samples for trace elements not specified in the specification. However, such
analysis is not required and may not cover all metallic Others elements. Should
any analysis by the producer or the purchaser establish that an Others element
The last approved version of this historical standard is referenced on
exceeds the limit of Each or that the aggregate of several Others elements
www.astm.org.
exceeds the limit of Total, the material shall be considered nonconforming.
Available from Aluminum Association, Inc., 1400 Crystal Dr., Suite 430,
E
Other Elements—Total shall be the sum of unspecified metallic elements
Arlington, VA 22202, http://www.aluminum.org.
0.010 % or more, rounded to the second decimal before determining the sum.
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, F
In case there is a discrepancy in the values listed in Table 1 with those listed in
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
the “International Alloy Designations and Chemical Composition Limits for
dodssp.daps.dla.mil.
Wrought Aluminum and Wrought Aluminum Alloys” (known as the “Teal Sheets”),
Available from SAE International (SAE), 400 Commonwealth Dr.,Warrendale,
the composition limits registered with the Aluminum Association and published in
PA 15096-0001, http://www.sae.org.
the “Teal Sheets” shall be considered the controlling composition. The “Teal
Available from European Committee for Standardization (CEN), 36 rue de
Sheets” are available at http://www.aluminum.org/tealsheets.
Stassart, B-1050, Brussels, Belgium, http://www.cenorm.be.
B308/B308M−20
A,B
TABLE 2 Tensile Property Limits
8.2.1 Methods of Sampling—Samples for chemical analysis
6061-T6
shall be taken in accordance with Practice B985.
Tensile strength, min, ksi [MPa] 38.0 [260]
8.2.2 Methods of Analysis—Analysis shall be performed in
Yield strength, min, ksi [MPa] 35.0 [240]
C
accordance with Test Methods E607, E1251, E3061,orEN
Elongation, min, %
D
in 2 in. [50 mm] 10 [10]
14242.
10 [9]
in 4D [5D or 5.65 A ]
œ
8.3 Other methods of analysis or in the case of dispute may
A
For purposes of determining conformance with this specification, each value for
be by agreement between the producer and the purchaser.
tensile strength and yield strength shall be rounded to the nearest 0.1 ksi [1 MPa],
and each value for elongation shall be rounded to the nearest 0.5 %, both in
NOTE 3—It is standard practice in the United States aluminum industry
accordance with the rounding method of Practice E29.
B
to determine conformance to the chemical composition limits prior to
The basis for mechanical property limits is given in Annex A1.
C
Elongations in 2 in. [50 mm] apply for profiles tested in full section and for further processing of ingots into wrought products. Due to the continuous
sheet-type specimens machined from material up through 0.500 in. [12.5 mm] in nature of the process, it is not practical to keep a specific ingot analysis
thickness having parallel surfaces. Elongations in 4D [5D or 5.65 A], where D
identified with a specific quantity of finished material.
œ
and A are diameter and cross-sectional area of the specimen, respectively, apply
to round test specimens machined from thicknesses over 0.250 in. [6.30 mm].
9. Heat Treatment
D
For thicknesses less than 0.250 in. [up through 6.30 mm] the minimum
9.1 Except as noted in 9.2, or otherwise specified in 9.3,
elongation is 8 %.
producer or supplier heat treatment shall be in accordance with
AMS 2772.
6. Quality Assurance
9.2 Unless otherwise specified, material may be solution
heat-treated and quenched at the extrusion press in accordance
6.1 Responsibility for Inspection and Tests—Unless other-
with Practice B807/B807M.
wise specified in the contract or purchase order, the producer is
responsible for the performance of all inspection and test
9.3 When specified, heat treatment shall be in accordance
requirements specified herein. The producer may use his own
with Practice B918.
or any other suitable facilities for the performance of the
inspection and test requirements specified herein, unless dis-
10. Tensile Properties
approvedbythepurchaserintheorderoratthetimeofcontract
10.1 Limits—The structural profiles shall conform to the
signing. The purchaser shall have the right to perform any of
tensile requirements specified in Table 2.
the inspections and tests set forth in this specification where
10.1.1 The elongation requirements shall not be applicable
such inspections are deemed necessary to ensure that material
to the following:
conforms to prescribed requirements.
10.1.1.1 Material of such dimensions that a standard test
specimen cannot be taken in accordance with Test Methods
7. General Quality
B557 or B557M and of such profile that it cannot be satisfac-
7.1 Unless otherwise specified, the structural profiles shall
torily tested in full section.
besuppliedinthemillfinishandshallbeuniforma
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