ASTM A939/A939M-15(2020)
(Practice)Standard Practice for Ultrasonic Examination from Bored Surfaces of Cylindrical Forgings (Withdrawn 2021)
Standard Practice for Ultrasonic Examination from Bored Surfaces of Cylindrical Forgings (Withdrawn 2021)
SIGNIFICANCE AND USE
3.1 This practice shall be used when ultrasonic inspection from the bore surface is required by the order or specification for inspection purposes in which the acceptance of the forging is based on limitations of the number, amplitude, or location of discontinuities or a combination thereof, which leads to ultrasonic indications.
3.2 The acceptance criteria shall be stated clearly as order requirements.
3.3 This practice requires pitch-catch search unit with twin transducers, which depending on the angle, are sensitive only to 2 in. to 3 in. [50 mm to 75 mm] into the metal from the bore surface.
SCOPE
1.1 This practice covers a basic procedure of ultrasonically inspecting cylindrical forgings with bores from the bore surface.
1.2 This practice applies to the manual testing mode. It does not restrict the use of other testing modes, such as mechanized or automated.
1.3 This practice applies to cylindrical forgings having bore sizes equal to or greater than 2.5 in. [64 mm].
1.4 This practice is expressed in inch-pound and SI units; however, the inch-pound units shall apply unless the purchase order or contract specifies the applicable “M” specification designation (SI units). The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
1.5 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.6 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.
WITHDRAWN RATIONALE
This practice covers a basic procedure of ultrasonically inspecting cylindrical forgings with bores from the bore surface.
Formerly under the jurisdiction of Committee A01 on Steel, Stainless Steel, and Related Alloys, this practice was withdrawn in May 2021. This standard is being withdrawn without replacement because there has been no activity in the subcommittee for many years, and no one in the subcommittee is currently aware of its usage in industry.
General Information
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: A939/A939M − 15 (Reapproved 2020)
Standard Practice for
Ultrasonic Examination from Bored Surfaces of Cylindrical
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Forgings
This standard is issued under the fixed designationA939/A939M; 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
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2.1 ASTM Standard:
1.1 This practice covers a basic procedure of ultrasonically
A788/A788M Specification for Steel Forgings, General Re-
inspecting cylindrical forgings with bores from the bore
quirements
surface.
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2.2 ASNT Standard:
1.2 This practice applies to the manual testing mode. It does
SNT-TC-1A Recommended Practice for Non-destructive
not restrict the use of other testing modes, such as mechanized
Personnel Qualifications and Certification
or automated.
3. Significance and Use
1.3 This practice applies to cylindrical forgings having bore
sizes equal to or greater than 2.5 in. [64 mm].
3.1 This practice shall be used when ultrasonic inspection
from the bore surface is required by the order or specification
1.4 This practice is expressed in inch-pound and SI units;
for inspection purposes in which the acceptance of the forging
however, the inch-pound units shall apply unless the purchase
is based on limitations of the number, amplitude, or location of
order or contract specifies the applicable “M” specification
discontinuities or a combination thereof, which leads to ultra-
designation (SI units). The values stated in either SI units or
sonic indications.
inch-pound units are to be regarded separately as standard.The
3.2 The acceptance criteria shall be stated clearly as order
values stated in each system are not necessarily exact equiva-
requirements.
lents; therefore, to ensure conformance with the standard, each
system shall be used independently of the other, and values
3.3 This practice requires pitch-catch search unit with twin
from the two systems shall not be combined.
transducers, which depending on the angle, are sensitive only
to 2 in. to 3 in. [50 mm to 75 mm] into the metal from the bore
1.5 This standard does not purport to address all of the
surface.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. General Requirements
priate safety, health, and environmental practices and deter-
4.1 As far as possible, the entire bore surface shall be
mine the applicability of regulatory limitations prior to use.
subjected to ultrasonic inspection. It may be impossible to
1.6 This international standard was developed in accor-
inspect some small portions of the bore surface because of
dance with internationally recognized principles on standard-
chamfers at step-downs and other local configurations.
ization established in the Decision on Principles for the
4.2 The bore ultrasonic inspection shall be performed after
Development of International Standards, Guides and Recom-
the final austenitizing and tempering heat treatment for me-
mendations issued by the World Trade Organization Technical
chanical properties of the forging, and may be performed either
Barriers to Trade (TBT) Committee.
prior to or after any subsequent stress relieving heat treatment.
4.3 The ultrasonic beam shall be introduced radially for
overall scanning.
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This practice is under the jurisdiction of ASTM Committee A01 on Steel, For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
A01.06 on Steel Forgings and Billets. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved March 1, 2020. Published March 2020. Originally the ASTM website.
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approved in 1995. Last previous edition approved in 2015 as A939/A939M–15. AvailablefromAmericanSocietyforNondestructiveTesting(ASNT),P.O.Box
DOI: 10.1520/A0939_A0939M–15R20. 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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A939/A939M − 15 (2020)
4.4 Forgings may be tested either when stationary or while beam width. Search units shall have interchangeable shoes that
rotated by means of a lathe or rollers. are machined to various diameters for matching different bore
diameters.
4.5 To ensure complete coverage of the bore surface, the
search unit shall be
...
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