ASTM B26 / B26M - 12

    Standard Specification for Aluminum-Alloy Sand Castings

    Active Standard ASTM B26 / B26M | Developed by Subcommittee: B07.01

    Book of Standards Volume: 02.02


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    Abstract

    This specification covers aluminum alloy sand castings except those that are for aerospace applications. The chemical compositions are determined in accordance with the specified suitable chemical and spectrochemical test methods. Addition of small amounts of modifiers and grain refining elements to the molten alloys from the remelting furnace is permitted before casting. Pure metals, recycled materials, and master alloys can also be used to make the alloys as long as the chemical composition can be analyzed and adjusted to conform to the requirements prior to pouring any casting. Castings should only be repaired using approved processes such as welding, impregnation, peening, blending, soldering, and so forth.

    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.

    Significance and Use

    1. Scope

    1.1 This specification covers aluminum-alloy sand castings designated as shown in Table 1.

    1.2 This specification is for aluminum-alloy sand castings used in general purpose applications. It may not address the mechanical properties, integrity testing, and verification required for highly loaded or safety critical applications.

    1.3 Alloy and temper designations are in accordance with ANSI H35.1/H35.1M. Unified Numbering System alloy designations are in accordance with Practice E527.

    1.4 Unless the order specifies the M specification designation, the material shall be furnished to the inch-pound units.

    1.5 For acceptance criteria for inclusion of new aluminum and aluminum alloys and their properties in this specification, see Annex A1 and Annex A2.

    1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.

    1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    TABLE 1 Chemical Composition Limits

    Note 1—When single units are shown, these indicate the maximum amounts permitted.

    Note 2—Analysis shall be made for the elements for which limits are shown in this table.

    Note 3—The following applies to all specified limits in this table: For purposes of determining conformance to these limits, an observed value or a calculated value obtained from analysis shall be rounded 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.

    Alloy AluminumComposition, (Values in Weight Percent)Others
    ANSIUNSSiliconIronCopperMan-
    ganese
    Magne-
    sium
    ChromiumNickelZincTinTitaniumEachTotal
    201.0 A02010remainder0.100.154.05.2 0.200.500.150.55... .........0.150.350.05A0.10
    204.0 A02040remainder0.200.354.25.0 0.100.150.35... 0.050.10 0.050.150.300.05 0.15
    242.0 A02420remainder0.71.03.74.5 0.351.21.80.25 1.72.30.35 ...0.250.05 0.15
    A242.0 A12420remainder0.60.83.74.5 0.101.21.70.150.251.82.30.10 ... 0.070.200.05 0.15
    295.0 A02950remainder0.71.5 1.04.05.00.350.03......0.35 ...0.250.050.15
    319.0 A03190remainder5.56.5 1.03.04.00.500.10...0.351.0 ...0.25...0.50
    328.0 A03280remainder7.58.5 1.01.02.00.200.60.200.60.35 0.251.5...0.25...0.50
    355.0 A03550remainder4.55.5 0.6B1.01.50.50B0.400.60.25... 0.35...0.25 0.050.15
    C355.0 A33550remainder4.55.5 0.201.01.50.100.400.6... ...0.10...0.200.05 0.15
    356.0 A03560remainder6.57.5 0.6B0.250.35B0.200.45...... 0.35...0.250.050.15
    A356.0 A13560remainder6.57.5 0.200.20 0.100.250.45... ...0.10 ...0.200.05 0.15
    443.0 A04430remainder4.56.0 0.80.6 0.500.050.25...0.50 ...0.25 ...0.35
    B443.0 A24430remainder4.56.0 0.80.15 0.350.05......0.35 ...0.25 0.050.15
    512.0 A05120remainder1.42.2 0.60.35 0.83.54.50.25 ...0.35...0.25 0.05 0.15
    514.0 A05140remainder0.350.500.15 0.353.54.5......0.15...0.25 0.050.15
    520.0 A05200remainder0.250.300.25 0.159.510.6......0.15 ...0.25 0.050.15
    535.0 A05350remainder0.150.150.05 0.100.256.27.5... .........0.100.250.05C 0.15
    705.0 A07050remainder0.200.80.20 0.400.61.41.80.200.40...2.73.3... 0.250.05 0.15
    707.0 A07070remainder0.200.80.20 0.400.61.82.40.200.40...4.04.5... 0.250.05 0.15
    710.0DA07100 remainder0.150.500.350.650.05 0.60.8......6.07.0... 0.250.050.15
    712.0DA07120 remainder0.300.500.250.100.500.650.400.6...5.06.5... 0.150.250.050.20
    713.0 A07130remainder0.251.10.401.0 0.60.200.500.35 0.157.08.0...0.250.10 0.25
    771.0 A07710remainder0.150.150.10 0.100.81.00.060.20...6.57.5...0.100.200.05 0.15
    850.0 A08500remainder0.70.70.71.3 0.100.10...0.71.3... 5.57.00.20...0.30
    851.0DA08510 remainder2.03.00.70.71.30.10 0.10...0.300.7...5.57.00.20...0.30
    852.0DA08520 remainder0.400.71.72.30.10 0.60.9...0.91.5...5.57.00.20...0.30

    A Contains silver 0.401.0 %.

    B If iron exceeds 0.45 %, manganese content shall not be less than one half of the iron content.

    C Contains beryllium 0.0030.007 %, boron 0.005 % max.

    D 710.0 formerly A712.0, 712.0 formerly D712.0, 851.0 formerly A850.0, 852.0 formerly B850.0.


    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

    B179 Specification for Aluminum Alloys in Ingot and Molten Forms for Castings from All Casting Processes

    B275 Practice for Codification of Certain Nonferrous Metals and Alloys, Cast and Wrought

    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

    B881 Terminology Relating to Aluminum- and Magnesium-Alloy Products

    B917/B917M Practice for Heat Treatment of Aluminum-Alloy Castings from All Processes

    D3951 Practice for Commercial Packaging

    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

    E94 Guide for Radiographic Examination

    E155 Reference Radiographs for Inspection of Aluminum and Magnesium Castings

    E165 Practice for Liquid Penetrant Examination for General Industry

    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

    E2422 Digital Reference Images for Inspection of Aluminum Castings

    AMS Standard

    AMS2771 Heat Treatment of Aluminum Alloy Castings


    ICS Code

    ICS Number Code 77.150.10 (Aluminium products)

    UNSPSC Code

    UNSPSC Code 31101606(Aluminum sand casting)


    DOI: 10.1520/B0026_B0026M-12

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