ASTM B491/B491M-23
(Specification)Standard Specification for Aluminum and Aluminum-Alloy Extruded Round Tubes for General-Purpose Applications
Standard Specification for Aluminum and Aluminum-Alloy Extruded Round Tubes for General-Purpose Applications
ABSTRACT
This specification covers aluminum and aluminum-alloy extruded round tubes either in coils or straight lengths, for general purpose applications such as refrigeration service, gas lines, oil lines, and instrument lines, in the alloys and tempers. Chemical composition: silicon, iron, copper, manganese, magnesium, chromium, zinc, vanadium, titanium, and aluminum. Tubes produced shall be cooled from an elevated temperature shaping process and naturally aged to a substantially stable condition. The specimen shall then undergo tests to check leakage and any evidence of leak shall be a cause for rejection. The ends of tubes in selected tempers shall be capable of being expanded by forcing a steel pin into the tube without signs of cracks, ruptures, or other defects clearly visible by normal vision. The tubes shall be supplied in the mill finish and shall be uniform as defined by the requirements of this specification and shall be commercially sound. Each tube shall be examined to determine conformance to this specification with respect to general quality and identification marking.
SCOPE
1.1 This specification covers aluminum and aluminum-alloy extruded round tubes either in coils or straight lengths, for general purpose applications such as refrigeration service, gas lines, oil lines, and instrument lines, in the alloys (Note 2) and tempers shown in Table 2 [Table 3], in outside diameters of 0.250 in. through 0.750 in. [6.00 mm through 20.00 mm]. For diameters over 0.500 in. through 0.750 in. [over 12.50 mm through 20.00 mm], the diameter and wall-thickness tolerances and eddy-current test parameters, if required, shall be agreed upon by the producer and the purchaser. Only tubes in aluminum 1200-H111 and 1235-H111 are sized after extrusion to minimize ovalness.
1.2 Alloy and temper designations are in accordance with ANSI H35.1/H35.1(M). The equivalent Unified Numbering System alloy designations are those of Table 1 preceded by A9 (for example, A91050 for aluminum 1050), in accordance with Practice E527.
Note 1: For extruded tubes see Specifications B221 or B221M, and for drawn tubes for general-purpose applications see Specification B483/B483M.
Note 2: Throughout this specification the term alloy in the general sense includes aluminum as well as aluminum alloy.
Note 3: For inch-pound orders specify B491; for metric orders specify B491M. Do not mix units.
1.3 For acceptance criteria for inclusion of new aluminum and aluminum alloys in this specification, see Annex A2.
1.4 The values stated in either inch-pound or SI units are to be regarded separately as standards. The SI units are shown either in brackets or in separate tables. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from two systems will result in nonconformance with the specification.
1.5 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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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: B491/B491M − 23
Standard Specification for
Aluminum and Aluminum-Alloy Extruded Round Tubes for
1
General-Purpose Applications
This standard is issued under the fixed designation B491/B491M; 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.
1. Scope* ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.1 This specification covers aluminum and aluminum-alloy
mendations issued by the World Trade Organization Technical
extruded round tubes either in coils or straight lengths, for
Barriers to Trade (TBT) Committee.
general purpose applications such as refrigeration service, gas
lines, oil lines, and instrument lines, in the alloys (Note 2) and
2. Referenced Documents
tempers shown in Table 2 [Table 3], in outside diameters of
2.1 The following documents of the issue in effect on the
0.250 in. through 0.750 in. [6.00 mm through 20.00 mm]. For
date of material purchase form a part of this specification to the
diameters over 0.500 in. through 0.750 in. [over 12.50 mm
extent referenced herein:
through 20.00 mm], the diameter and wall-thickness tolerances
2
and eddy-current test parameters, if required, shall be agreed
2.2 ASTM Standards:
upon by the producer and the purchaser. Only tubes in
B221 Specification for Aluminum and Aluminum-Alloy Ex-
aluminum 1200-H111 and 1235-H111 are sized after extrusion
truded Bars, Rods, Wire, Profiles, and Tubes
to minimize ovalness.
B221M Specification for Aluminum and Aluminum-Alloy
Extruded Bars, Rods, Wire, Profiles, and Tubes (Metric)
1.2 Alloy and temper designations are in accordance with
B483/B483M Specification for Aluminum and Aluminum-
ANSI H35.1/H35.1(M). The equivalent Unified Numbering
Alloy Drawn Tube and Drawn Pipe for General Purpose
System alloy designations are those of Table 1 preceded by A9
Applications
(for example, A91050 for aluminum 1050), in accordance with
B557 Test Methods for Tension Testing Wrought and Cast
Practice E527.
Aluminum- and Magnesium-Alloy Products
NOTE 1—For extruded tubes see Specifications B221 or B221M, and
B557M Test Methods for Tension Testing Wrought and Cast
for drawn tubes for general-purpose applications see Specification B483/
Aluminum- and Magnesium-Alloy Products (Metric)
B483M.
NOTE 2—Throughout this specification the term alloy in the general B660 Practices for Packaging/Packing of Aluminum and
sense includes aluminum as well as aluminum alloy.
Magnesium Products
NOTE 3—For inch-pound orders specify B491; for metric orders specify
B666/B666M Practice for Identification Marking of Alumi-
B491M. Do not mix units.
num and Magnesium Products
1.3 For acceptance criteria for inclusion of new aluminum
B881 Terminology Relating to Aluminum- and Magnesium-
and aluminum alloys in this specification, see Annex A2.
Alloy Products
B945 Practice for Aluminum Alloy Extrusions Press Cooled
1.4 The values stated in either inch-pound or SI units are to
from an Elevated Temperature Shaping Process for Pro-
be regarded separately as standards. The SI units are shown
duction of T1, T2, T5 and T10-Type Tempers
either in brackets or in separate tables. The values stated in
B985 Practice for Sampling Aluminum Ingots, Billets, Cast-
each system are not exact equivalents; therefore, each system
ings and Finished or Semi-Finished Wrought Aluminum
must be used independently of the other. Combining values
Products for Compositional Analysis
from two systems will result in nonconformance with the
E29 Practice for Using Significant Digits in Test Data to
specification.
Determine Conformance with Specifications
1.5 This international standard was developed in accor-
E215 Practice for Standardizing Equipment and Electromag-
dance with internationally recognized principles on standard-
netic Examination of Seamless Aluminum-Alloy Tube
1
This specification is under the jurisdiction of ASTM Committee B07 on Light
Metals and Alloys and is the direct responsibility of Subcommittee B07.03 on
2
Aluminum Alloy Wrought Products. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Nov. 1, 2023. Published December 2023. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1969. Last previous edition approved in 2015 as B491/B491M – 15. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/B0491_B0491M-23. the ASTM website.
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM 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: B491/B491M − 15 B491/B491M − 23
Standard Specification for
Aluminum and Aluminum-Alloy Extruded Round Tubes for
1
General-Purpose Applications
This standard is issued under the fixed designation B491/B491M; 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.
1. Scope*
1.1 This specification covers aluminum and aluminum-alloy extruded round tubes either in coils or straight lengths, for general
purpose applications such as refrigeration service, gas lines, oil lines, and instrument lines, in the alloys (Note 2) and tempers
shown in Table 2 [Table 3], in outside diameters of 0.2500.250 in. through 0.750 in. [6.00[6.00 mm through 20.00 mm]. For
diameters over 0.500 through 0.750 in. [over 12.500.500 in. through 0.750 in. [over 12.50 mm through 20.00 mm], the diameter
and wall-thickness tolerances and eddy-current test parameters, if required, shall be agreed upon by the producer and the purchaser.
Only tubes in aluminum 1200-H111 and 1235-H111 are sized after extrusion to minimize ovalness.
1.2 Alloy and temper designations are in accordance with ANSI H35.1/H35.1(M). The equivalent Unified Numbering System
alloy designations are those of Table 1 preceded by A9 (for example, A91050 for aluminum 1050), in accordance with Practice
E527.
NOTE 1—For extruded tubes see SpecificationSpecifications B221 or B221M, and for drawn tubes for general-purpose applications see Specification
B483B483/B483M.
NOTE 2—Throughout this specification the term alloy in the general sense includes aluminum as well as aluminum alloy.
NOTE 3—For inch-pound orders specify B491; for metric orders specify B491M. Do not mix units.
1.3 For acceptance criteria for inclusion of new aluminum and aluminum alloys in this specification, see Annex A2.
1.4 The values stated in either inch-pound or SI units are to be regarded separately as standards. The SI units are shown either
in brackets or in separate tables. The values stated in each system are not exact equivalents; therefore, each system must be used
independently of the other. Combining values from two systems will result in nonconformance with the specification.
1.5 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.
2. Referenced Documents
2.1 The following documents of the issue in effect on the date of material purchase form a part of this specification to the extent
referenced herein:
1
This specification is under the jurisdiction of ASTM Committee B07 on Light Metals and Alloys and is the direct responsibility of Subcommittee B07.03 on Aluminum
Alloy Wrought Products.
Current edition approved Jan. 1, 2015Nov. 1, 2023. Published January 2015December 2023. Originally approved in 1969. Last previous edition approved in 20062015
as B491/B491M – 06.B491/B491M – 15. DOI: 10.1520/B0491_B0491M-15.10.1520/B0491_B0491M-23.
*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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B491/B491M − 23
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2.2 ASTM Standards:
B221 Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes
B221M Specification for Aluminum and Aluminum-Alloy Extruded Bars, Rods, Wire, Profiles, and Tubes (Metric)
B483/B483M Specification for Aluminum and Aluminum-Alloy Drawn Tube and Drawn Pipe for General Purpose Applications
B557 Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products
B557M Test Methods for Tension Testing Wrought and Cast Aluminum- and Magnesium-Alloy Products (Metric)
B660 Practices for Packaging/Packing of Aluminum and Magnesium Products
B666/B666M Practice for Identification Marking of Aluminum and Magnesium Products
B881 Terminology Relating to Aluminum- and Magnesium-Alloy Products
B945 Practice for Aluminum Alloy Extrusions Press Cooled from an Elevated Temperature Shaping Process for Production of
T1, T2, T5 and T10-Type Tempers
B985 Practice for Sampling Aluminum Ingots, Billets, Castings and Finished or Semi-Finis
...
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