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    ASTM

    ASTM B491/B491M : 15

    Standard Specification for Aluminum and Aluminum-Alloy Extruded Round Tubes for General-Purpose Applications

    Standard Details

    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 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.

    (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 E29.
    (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, rounded to the second decimal before determining the sum.
    (G) Vanadium 0.05%, maximum.
    (H) In case there of a discrepancy in the values listed in Table 1 with those listed in the “International Alloy Designations and Chemical Composition Limits for Wrought Aluminum and Wrought Aluminum Alloys” (known as the “Teal Sheets”), the composition limits registered with the Aluminum Association and published in the “Teal Sheets” should be considered the controlling composition. The “Teal Sheets” are available at http://www.aluminum.org/tealsheets.
    (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 E29.
    (C) Tubes in this alloy are also available in the F (as extruded) temper. Tensile properties for F temper are not specified or guaranteed.
    (D) Maximum tensile strength for coils. No maximum limit for extruded lengths.
    (A) Tubes in this alloy are also available in the F (as extruded) temper. Tensile properties for F temper are not specified or guaranteed.
    (B) Maximum tensile strength for coils. No maximum limit for extruded lengths.

    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 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 StandardDetails. 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.

    General Information

    Status : Historical
    Standard Type: Main
    Document No: ASTM B491/B491M : 15
    Document Year: 2015
    Pages: 7
    • Section Volume:
    • 02.02 Volume 02.02 Aluminum and Magnesium Alloys
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