ASTM E428 - 08(2013)

    Standard Practice for Fabrication and Control of Metal, Other than Aluminum, Reference Blocks Used in Ultrasonic Testing

    Active Standard ASTM E428 | Developed by Subcommittee: E07.06

    Book of Standards Volume: 03.03


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    Significance and Use

    5.1 Reference blocks fabricated in accordance with this practice will exhibit specific area-amplitude and distance-amplitude relationships only with an immersion test at 5 MHz using the search unit, test instrument and test parameters described in this practice. Comparison test at other frequencies or with uncalibrated instruments will not necessarily give the same relationships shown in this practice. See Reference (1) for area-amplitude limitations at other frequencies and transducer diameters. Also see Reference (2) for cautions regarding use of standard blocks for test standardizations.

    1. Scope

    1.1 This practice covers a procedure for fabrication and control of metal alloy reference blocks used in ultrasonic examination that have a flat-surface sound entry, are cylindrical in shape, and contain flat-bottom holes (FBH) which may be used for checking the performance of ultrasonic examination instrumentation and search units and for standardization and control of ultrasonic examination of metal alloy products. The reference blocks described are suitable for use with either the direct-contact method or immersion pulse-echo ultrasonic methods.

    Note 1Use of flat-surface reference blocks may not be suitable for cylindrical materials (3)2.

    1.2 While this procedure is basically designed for the fabrication and control of carbon and alloy steel blocks to be used in conjunction with the examination of these materials, the fabrication and control procedures may also be suitable for the preparation of blocks for other types of materials such as nickel-base alloys, certain types of aluminum alloys, and so forth. Additional procedures and controls may be required when fabricating reference blocks from other than carbon or alloy steel material. This practice shall in no way preclude the specification or addition of any supplemented requirements as deemed necessary for the specific application. This practice, however, must not be confused with, nor does it supersede Practice E127, specifically governing the fabrication and evaluation of 7075-T6 aluminum alloy ultrasonic standard reference blocks.

    Note 2Practice E127 and Guide E1158 also describe procedures for selecting material, fabricating blocks, and checking response. Unlike this practice, Practice E127 has requirements for evaluation relative to a specified standard target.

    1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

    1.4 This standard does not purport to address all of the safety problems, 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.


    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

    E127 Practice for Fabricating and Checking Aluminum Alloy Ultrasonic Standard Reference Blocks

    E1158 Guide for Material Selection and Fabrication of Reference Blocks for the Pulsed Longitudinal Wave Ultrasonic Testing of Metal and Metal Alloy Production Material

    E1316 Terminology for Nondestructive Examinations


    ICS Code

    ICS Number Code 77.040.20 (Non-destructive testing of metals)

    UNSPSC Code

    UNSPSC Code 41111804(Ultrasonic examination equipment)


    Referencing This Standard

    DOI: 10.1520/E0428

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM E428-08(2013), Standard Practice for Fabrication and Control of Metal, Other than Aluminum, Reference Blocks Used in Ultrasonic Testing, ASTM International, West Conshohocken, PA, 2013, www.astm.org

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