ASTM B491/B491M-00
(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
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 [2M], in outside diameters of 0.250 through 0.750 in. [6.00 through 20.00 mm]. For diameters over 0.500 through 0.750 in. [over 12.50 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 [H35.1M]. 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 Specification B221, and for drawn tubes for general-purpose applications see Specification B483. 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.
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Designation: B 491/B 491M – 00
Standard Specification for
Aluminum and Aluminum-Alloy Extruded Round Tubes for
General-Purpose Applications
This standard is issued under the fixed designation B 491/B 491M; 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 (e) 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. Referenced Documents
1.1 Thisspecificationcoversaluminumandaluminum-alloy 2.1 The following documents of the issue in effect on the
extruded round tubes either in coils or straight lengths, for date of material purchase form a part of this specification to the
general purpose applications such as refrigeration service, gas extent referenced herein:
lines, oil lines, and instrument lines, in the alloys (Note 2) and 2.2 ASTM Standards:
tempers shown in Table 2 [Table 3], in outside diameters of B 557 Test Methods of Tension Testing Wrought and Cast
0.250 through 0.750 in. [6.00 through 20.00 mm]. For diam- Aluminum- and Magnesium-Alloy Products
eters over 0.500 through 0.750 in. [over 12.50 through 20.00 B 557M Test Methods ofTensionTestingWrought and Cast
mm], the diameter and wall-thickness tolerances and eddy- Aluminum- and Magnesium-Alloy Products (Metric)
current test parameters, if required, shall be agreed upon by the B 660 Practices for Packaging/Packing of Aluminum and
producer and the purchaser. Only tubes in aluminum 1200- Magnesium Products
H111 and 1235-H111 are sized after extrusion to minimize B 666/B 666M Practice for Identification Marking of Alu-
ovalness. minum Products
1.2 Alloy and temper designations are in accordance with B 807 Practice for Extrusion Press Solution Heat Treatment
ANSI H35.1[H35.1M]. The equivalent Unified Numbering for Aluminum Alloys
System alloy designations are those of Table 1 preceded byA9 E 29 Practice for Using Significant Digits in Test Data to
(for example,A91050 for aluminum 1050) in accordance with Determine Conformance with Specifications
Practice E 527. E 34 Test Methods for ChemicalAnalysis ofAluminum and
Aluminum Base Alloys
NOTE 1—For extruded tubes see Specification B 221, and for drawn
E 55 PracticeforSamplingWroughtNonferrousMetalsand
tubes for general-purpose applications see Specification B 483.
Alloys for Determination of Chemical Composition
NOTE 2—Throughout this specification the term alloy in the general
sense includes aluminum as well as aluminum alloy. E 215 Practice for Standardizing Equipment for Electro-
NOTE 3—For inch-pound orders specify B 491; for metric orders
magnetic Testing of Seamless Aluminum-Alloy Tube
specify B 491M. Do not mix units.
E 227 Test Method for Optical Emission Spectrometric
Analysis of Aluminum and Aluminum Alloys by the
1.3 For acceptance criteria for inclusion of new aluminum
Point-to-Plane Technique
and aluminum alloys in this specification, see Annex A2.
E 527 Practice for Numbering Metals and Alloys (UNS)
1.4 The values stated in either inch-pound or SI units are to
E 607 Test Method for Optical Emission Spectrometric
be regarded separately as standards. The SI units are shown
Analysis of Aluminum and Aluminum Alloys by the
either in brackets or in separate tables. The values stated in
Point-to-Plane Technique, Nitrogen Atmosphere
each system are not exact equivalents; therefore, each system
E 716 Practices for Sampling Aluminum and Aluminum
must be used independently of the other. Combining values
Alloys for Spectrochemical Analysis
from two systems will result in nonconformance with the
specification.
Annual Book of ASTM Standards, Vol 02.02.
1 3
This specification is under the jurisdiction of ASTM Committee B07 on Light Annual Book of ASTM Standards, Vol 14.02.
Metals and Alloys and is the direct responsibility of Subcommittee B07.03 on Annual Book of ASTM Standards, Vol 03.05.
Aluminum Alloy Wrought Products. Annual Book of ASTM Standards, Vol 03.03.
Current edition approved May 10, 2000. Published August 2000. Originally Annual Book of ASTM Standards, Vol 01.01.
published as B 491–69. Last previous edition B 491/B 491M–95. Annual Book of ASTM Standards, Vol 03.06.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 491/B 491M
A,B,C
TABLE 1 Chemical Composition Limits
Other
Magne- Chro- Vana- Tita- D
Elements
Alloy Silicon Iron Copper Manganese Zinc Aluminum
sium mium dium nium
E
Each Total
F
1050 0.25 0.40 0.05 0.05 0.05 . 0.05 0.05 0.03 0.03 . 99.50
F
1100 0.95 Si + Fe 0.05–0.20 0.05 . . 0.10 . . 0.05 0.15 99.00
F
1200 1.00 Si + Fe 0.05 0.05 . . 0.10 . 0.05 0.05 0.15 99.00
F
1235 0.65 Si + Fe 0.05 0.05 0.05 . 0.10 0.05 0.06 0.03 . 99.35
3003 0.6 0.7 0.05–0.20 1.0–1.5 . . 0.10 . . 0.05 0.15 remainder
3102 0.40 0.7 0.10 0.05–0.40 . . 0.30 . 0.10 0.05 0.15 remainder
6063 0.20–0.6 0.35 0.10 0.10 0.45–0.9 0.10 0.10 . 0.10 0.05 0.15 remainder
A
Limits are in percent maximum unless shown as a range or otherwise stated.
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 a calculated value attained from analysis shall be rounded off to the nearest unit in
the last right-hand place of figures used in expressing the specified limit, in accordance with the rounding method of Practice E 29.
D
Others includes listed elements for which no specific limit is shown as well as unlisted metallic elements. The producer may analyze 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 exceeds the limit of Each or that the aggregate of several Others elements exceeds the limit of Total, the material shall be considered
nonconforming.
E
Other Elements—Total shall be the sum of unspecified metallic elements 0.010 % or more, rounded to the second decimal before determining the sum.
F
The aluminum content shall be calculated by subtracting from 100.00 % the sum of all metallic elements present in amounts of 0.010 % or more each, roundedtothe
second decimal before determining the sum.
A,B
TABLE 2 Tensile Property Limits
Yield Strength
Tensile Strength, ksi
Specified Wall Elongation in
Alloy Temper (0.2 % Offset)
Thickness, in. 2 in. min, %
min max
min, ksi
C
1050 H112 0.032–0.050 8.5 14.5 2.5 25
C
1100 H112 0.032–0.050 11.0 . 3.0 25
C
1200 H111 0.032–0.050 11.0 17.0 9.5 25
H112 0.032–0.050 10.0 16.0 3.0 25
C
1235 H111 0.032–0.050 11.0 . 7.5 30
H112 0.032–0.050 9.0 15.0 3.0 25
C
3003 H112 0.032–0.050 14.0 . 5.0 25
3102 H112 0.032–0.050 11.0 18.0 4.0 25
6063 T1 0.032–0.050 17.0 . 9.0 12
A
The basis for establishment of mechanical property limits is shown in Annex A1.
B
To determine conformance to this specification, each value for tensile strength and for yield strength shall be rounded to the nearest 0.1 ksi and each value for
elongation to the nearest 0.5 %, both in accordance with the rounding method of Practice E 29.
C
Tubes in this alloy are also available in the F (as extruded) temper. Tensile properties for F temper are not specified or guaranteed.
TABLE 3 Tensile Property Limits [SI Units]
Yield Strength Elongation
Tensile Strength, MPa
Specified Wall
Alloy Temper (0.2 % Offset) in 50 mm
Thickness, mm
min max
min, MPa min, %
A
1050 H112 0.80–1.30 60 100 15 25
A
1100 H112 0.80–1.30 75 . 20 25
A
1200 H111 0.80–1.30 75 115 65 25
H112 0.80–1.30 70 110 20 25
A
1235 H111 0.80–1.30 75 . 50 30
H112 0.80–1.30 60 105 20 25
A
3003 H112 0.80–1.30 95 . 35 25
3102 H112 0.80–1.30 95 125 30 25
6063 T1 0.80–1.30 115 . 60 12
A
Tubes in this alloy are also available in the F (as extruded) temper. Tensile properties for F temper are not specified or guaranteed.
E 1251 Test Method for Optical Emission Spectrometric H35.2M Dimensional Tolerances for Aluminum Mill Prod-
Analysis ofAluminum andAluminumAlloys by theArgon ucts (Metric)
Atmosphere, Point-to-Plane, Unipolar Self-Initiating Ca-
2.4 Federal Standard:
pacitor Discharge
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
2.3 ANSI Standards: 8
2.5 Military Standard:
H35.1 Alloy and Temper Designation Systems for Alumi-
MIL-STD-129 Marking for Shipment and Storage
num
H35.1M Alloy and Temper Designation Systems for Alu-
minum (Metric)
H35.2 Dimensional Tolerances for Aluminum Mill Prod-
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
ucts Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
B 491/B 491M
3. Terminology 6. Responsibility for Quality Assurance
3.1 Definitions: 6.1 Responsibility for Inspection— Unless otherwise speci-
3.1.1 tube—a hollow wrought product that is long in rela- fied in the contract or purchase order, the producer is respon-
tion to its cross section, that is round, a regular hexagon, a sible for the performance of all inspection and test require-
regular octagon, elliptical, or square or rectangular with sharp ments specified herein. Except as otherwise specified in the
or rounded corners, and that has uniform wall thickness except contract or order, the producer may use his own or any other
as may be affected by corner radii. suitable facilities for the performance of the inspection and test
3.1.1.1 extruded tube—a tube formed by hot extruding. requirements specified herein, unless disapproved by the pur-
3.1.1.2 sized tube—a tube which, after extrusion, has been chaser.The purchaser shall have the right to perform any of the
cold drawn a slight amount to minimize ovalness. inspections and tests set forth in this specification where such
3.1.2 producer—the primary manufacturer of the material. inspections are deemed necessary to assure that material
3.1.3 supplier—includes only the category of jobbers and conforms to prescribed requirements.
distributors as distinct from producers. 6.2 Lot Definition—An inspection lot shall be defined as
3.2 Definitions of Terms Specific to This Standard: follows:
3.2.1 capable of—The term capable of as used in this 6.2.1 For heat-treated tempers, an inspection lot shall con-
specification means that the test need not be performed by the sist of an identifiable quantity of material of the same mill
producer of the material. However, should testing by the form, alloy, temper, and nominal dimensions traceable to a
purchaser establish that the material does not meet these heat-treated lot or lots, and subjected to inspection at one time.
requirements, the material shall be subject to rejection. 6.2.2 For nonheat-treated tempers, an inspection lot shall
consist of an identifiable quantity of material of the same mill
4. Ordering Information
form, alloy, temper, and nominal dimensions subjected to
4.1 Orders for material to this specification shall include the inspection at one time.
following information:
4.1.1 This specification designation (which includes the
7. Chemical Composition
number, the year, and the revision letter, if applicable),
7.1 Limits—The tubes shall conform to the chemical com-
position limits specified in Table 1. Conformance shall be
NOTE 4—For inch-pound orders specify B 491, for metric orders
specify B 491M. Do not mix units. determined by analyzing samples taken at the time the ingots
are poured or samples taken from the finished or semifinished
4.1.2 Quantity in pieces or pounds [kilograms],
product. If the producer has determined the chemical compo-
4.1.3 Alloy (Section 7),
sition of the material during the course of manufacture he shall
4.1.4 Temper (Section 8),
not be required to sample and analzye the finished product.
4.1.5 Cross-sectionaldimensions(outsidediameterandwall
thickness, or inside diameter and wall thickness),
NOTE 5—It is standard practice in the United States aluminum industry
4.1.6 Length, random or specific, to determine conformance to the chemical composition limits prior to
further processing of ingots into wrought products. Due to the continuous
4.1.7 Nominal inside diameter of coils, and weight or
nature of the process, it is not practical to keep a specific ingot analysis
maximum outside diameter, if applicable (18.3),
identified with a specific quantity of finished material.
4.2 Additionally, orders for material to this specification
shall include the following information when required by the 7.2 Number of Samples—The number of samples taken for
purchaser: determination of chemical composition shall be as follows:
4.2.1 Whether testing for leaks is required (Section 10), and 7.2.1 When samples are taken at the time the ingots are
frequency of testing required, poured, at least one sample shall be taken for each group of
4.2.2 For aluminum 1200-H111 and 1235-H111, whether ingots poured simultaneously from the same source of molten
metal.
inside cleanliness test is required (11.2), and frequency of
testing required, 7.2.2 When samples are taken from the finished or semifin-
ished product, a sample shall be taken to represent each 4000
4.2.3 Whether inspection or witness of inspection and tests
by the purchaser’s representative is required prior to material lb [2000 kg] or fraction thereof in the lot, except that not more
shipment (Section 14), than one sample shall be required per piece.
4.2.4 Whether certification is required (Section 16), 7.3 Methods of Sampling—Samples for determination of
4.2.5 Whether marking for identification is required (Sec- chemical composition shall be taken in accordance with one of
tion 17), and the following methods:
4.2.6 Whether Practices B 660 applies and, if so, the levels 7.3.1 Samples for chemical analysis shall be taken from the
of preservation packaging, and packing required (18.4). material by drilling, sawing, milling, turning, or clipping a
representative piece or pieces to obtain a prepared sample of
5. Manufacture
not less than 75 g. Sampling shall be in accordance with
5.1 The tubes covered by this specification shall be pro- Practice E 55.
duced by the hot-extrusion method. The tube ends shall be 7.3.2 Sampling for spectrochemical analysis shall be in
crimped or otherwise sealed to avoid contamination during accordancewithPracticesE 716.Samplesforothermethodsof
shipping. When sized tube in aluminum 1200-H111 or 1235- analysis shall be suitable for the form of material being
H111 is required the extruded tube may be lightly cold drawn. analyzed and the type of analytical method used.
B
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