ASTM A577/A577M-17(2023)
(Specification)Standard Specification for Ultrasonic Angle-Beam Examination of Steel Plates
Standard Specification for Ultrasonic Angle-Beam Examination of Steel Plates
ABSTRACT
This specification covers ultrasonic angle-beam procedure and acceptance standards for the detection of internal discontinuities not laminar in nature and of surface imperfections in a steel plate. This specification is intended for use only as a supplement to specifications which provide straight-beam ultrasonic examination. The ultrasonic frequency for the examination shall be the highest frequency that permits detection of the required calibration notch.
SCOPE
1.1 This specification2 covers an ultrasonic angle-beam procedure and acceptance standards for the detection of internal discontinuities not laminar in nature and of surface imperfections in a steel plate. This specification is intended for use only as a supplement to specifications which provide straight-beam ultrasonic examination.
Note 1: An internal discontinuity that is laminar in nature is one whose principal plane is parallel to the principal plane of the plate.
1.2 Individuals performing examinations in accordance with this specification shall be qualified and certified in accordance with the requirements of the latest edition of ASNT SNT-TC-1A or an equivalent accepted standard. An equivalent standard is one which covers the qualification and certification of ultrasonic nondestructive examination candidates and which is acceptable to the purchaser.
1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: A577/A577M − 17 (Reapproved 2023)
Standard Specification for
Ultrasonic Angle-Beam Examination of Steel Plates
This standard is issued under the fixed designation A577/A577M; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
2.1 ASTM Standards:
1.1 This specification covers an ultrasonic angle-beam
E317 Practice for Evaluating Performance Characteristics of
procedure and acceptance standards for the detection of inter-
Ultrasonic Pulse-Echo Testing Instruments and Systems
nal discontinuities not laminar in nature and of surface imper-
without the Use of Electronic Measurement Instruments
fections in a steel plate. This specification is intended for use
E1316 Terminology for Nondestructive Examinations
only as a supplement to specifications which provide straight-
E2491 Guide for Evaluating Performance Characteristics of
beam ultrasonic examination.
Phased-Array Ultrasonic Testing Instruments and Systems
NOTE 1—An internal discontinuity that is laminar in nature is one
2.2 ASNT Standards:
whose principal plane is parallel to the principal plane of the plate.
SNT-TC-1A Recommended Practice for Personnel Qualifi-
cation and Certification in Nondestructive Testing
1.2 Individuals performing examinations in accordance with
this specification shall be qualified and certified in accordance
3. Terminology
with the requirements of the latest edition of ASNT SNT-
TC-1A or an equivalent accepted standard. An equivalent
3.1 Definitions—For definitions of terms relating to nonde-
standard is one which covers the qualification and certification structive examinations used in this specification, refer to
of ultrasonic nondestructive examination candidates and which
Terminology E1316.
is acceptable to the purchaser.
4. Ordering Information
1.3 The values stated in either inch-pound units or SI units
4.1 The inquiry and order shall indicate any additions to the
are to be regarded separately as standard. Within the text, the
provisions of this specification as prescribed in 12.1.
SI units are shown in brackets. The values stated in each
system are not exact equivalents; therefore, each system must
5. Examination Conditions
be used independently of the other. Combining values from the
5.1 The examination shall be conducted in an area free of
two systems may result in nonconformance with the specifi-
operations that interfere with proper performance of the
cation.
examination.
1.4 This international standard was developed in accor-
5.2 The surface of the plate shall be conditioned as neces-
dance with internationally recognized principles on standard-
sary to provide a clear, easily interpreted A-scan on the screen
ization established in the Decision on Principles for the
of the ultrasonic instrument. Any specified identification which
Development of International Standards, Guides and Recom-
is removed to achieve proper surface smoothness shall be
mendations issued by the World Trade Organization Technical
restored.
Barriers to Trade (TBT) Committee.
6. Apparatus
6.1 Ultrasonic Instruments:
6.1.1 The ultrasonic instrument shall be a pulse echo type
instrument capable of addressing either a mono-element probe
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.11 on Steel Plates for Boilers and Pressure Vessels. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Nov. 1, 2023. Published November 2023. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1967. Last previous edition approved in 2017 as A577/A577M – 17. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/A0577_A0577M-17R23. the ASTM website.
2 4
For ASME Boiler and Pressure Vessel Code applications, see related Specifi- Available from American Society for Nondestructive Testing (ASNT), P.O. Box
cation SA-577/SA-577M in Section II of that Code. 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A577/A577M − 17 (2023)
or a phased-array probe and shall be equipped with a standard- indication. Adjust the instrument gain so that this reflection
ized dB gain or attenuation control stepped in increments of amplitude is at least 50 % but not more than 80 % of full screen
1 dB minimum. The system shall be capable of generating and height. Record the location and amplitude of this indication on
displaying A-scans. the screen.
9.1.2 Move the search unit away from the notch until the
6.2 Vertical and horizontal linearity and amplitude control
second vee-path indication is obtained. Maximize the response
linearity shall be checked in accordance with Practice E317,
and record the indication amplitude. Draw a line between the
Guide E2491, or another procedure approved by the users of
peaks from the two successive notch indications on the screen.
this specification. An acceptable linearity performance may be
This line is the distance amplitude correction (DAC) curve for
agreed upon by the manufacturer and purchaser.
this material and shall be a 100 % reference line for reporting
6.3 The search unit shall be a 45-deg (in steel) angle-beam
indication amplitudes. Alternatively the second vee-path indi-
type with active transducer length and width dimensions of a
cation may be set to equalize its amplitude to the first vee-path
minimum of ⁄2 in. [12.5 mm] and a maximum of 1 in.
signal using time-corrected gain.
[25 mm]. When phased-array systems are used, focal laws
9.2 Plate Over 2 in. to 6 in. [50 mm to 150 mm] Inclusive in
using an equivalent active aperture shall be used. Search units
Thickness:
of other sizes and angles may be used for additional explora-
9.2.1 Place the search unit on the test surface aimed at the
tion and evaluation.
broad side of the notch on the opposite surface of the plate.
Maximize the one-half vee-path indication amplitude. Adjust
7. Examination Frequency
the instrument gain so that this amplitude is at least 50 % but
7.1 A nominal test frequency of 5 MHz is recommended.
not more than 80 % of full screen height. Record the location
Thickness, grain size, or microstructure of the material and
and amplitude on the screen. Without adjusting the instrument
nature of the equipment or method may permit a higher or
settings, repeat this procedure for the 1 ⁄2 vee-path indication.
require a lower examination frequency. The ultrasonic fre-
9.2.2 Without adjusting the instrument settings, maximize
quency selected for the examination shall permit detection of
the full vee-path indication from the notch on the test surface.
the required calibration notch, such that the amplitude of the
Record the location
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.