ASTM B491 / B491M - 15

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

    Active Standard ASTM B491 / B491M | Developed by Subcommittee: B07.03

    Book of Standards Volume: 02.02


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    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.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    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 0.250 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 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.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    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-Finished Wrought Aluminum Products for Compositional Analysis

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E34 Test Methods for Chemical Analysis of Aluminum and Aluminum-Base Alloys

    E215 Practice for Standardizing Equipment for Electromagnetic Testing of Seamless Aluminum-Alloy Tube

    E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)

    E607 Test Method for Atomic Emission Spectrometric Analysis Aluminum Alloys by the Point to Plane Technique Nitrogen Atmosphere

    E716 Practices for Sampling and Sample Preparation of Aluminum and Aluminum Alloys for Determination of Chemical Composition by Spectrochemical Analysis

    E1251 Test Method for Analysis of Aluminum and Aluminum Alloys by Spark Atomic Emission Spectrometry


    ICS Code

    ICS Number Code 23.040.15 (Non-ferrous metal pipes)

    UNSPSC Code

    UNSPSC Code 40182700(Extruded aluminum tubes); 30102306(Aluminum profiles)


    Referencing This Standard

    DOI: 10.1520/B0491_B0491M-15

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM B491 / B491M-15, Standard Specification for Aluminum and Aluminum-Alloy Extruded Round Tubes for General-Purpose Applications, ASTM International, West Conshohocken, PA, 2015, www.astm.org

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