ASTM E426-16

Standard Practice for Electromagnetic (Eddy Current) Examination of Seamless and Welded Tubular Products, Titanium, Austenitic Stainless Steel and Similar Alloys

SIGNIFICANCE AND USE
5.1 Eddy current testing is a nondestructive method of locating discontinuities in a product. Changes in electromagnetic response caused by the presence of discontinuities are detected by the sensor, amplified and modified in order to actuate audio or visual indicating devices, or both, or a mechanical marker. Signals can be caused by outer surface, inner surface, or subsurface discontinuities. The eddy current examination is sensitive to many factors that occur as a result of processing (such as variations in conductivity, chemical composition, permeability, and geometry) as well as other factors not related to the tubing. Thus, all received indications are not necessarily indicative of defective tubing.
SCOPE
1.1 This practice2 covers procedures for eddy current examination of seamless and welded tubular products made of relatively low conductivity materials such as titanium, stainless steel, and similar alloys, such as nickel alloys. Austenitic chromium-nickel stainless steels, which are generally considered to be nonmagnetic, are specifically covered as distinguished from the martensitic and ferritic straight chromium stainless steels which are magnetic.  
1.2 This practice is intended as a guide for eddy current examination of both seamless and welded tubular products using either an encircling coil or a probe-coil technique. Coils and probes are available that can be used inside the tubular product; however, their use is not specifically covered in this document. This type of examination is usually employed only to examine tubing which has been installed such as in a heat exchanger.  
1.3 This practice covers the examination of tubular products ranging in diameter from 0.125 to 5 in. (3.2 to 127.0 mm) and wall thicknesses from 0.005 to 0.250 in. (0.127 to 6.4 mm).  
1.4 For examination of aluminum alloy tubular products, see standard Practice E215.  
1.5 Units—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.  
1.6 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.

General Information

• Status: Historical
• Publication Date: 30-Nov-2016
• ICS: 23.040.10 - Iron and steel pipes
• Technical Committee: E07 - Nondestructive Testing
• Drafting Committee: E07.07 - Electromagnetic Method

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.
E42616Standard
Practice for Electromagnetic (Eddy Current)
Examination of Seamless and Welded Tubular Products, Titanium,
Austenitic Stainless Steel and Similar
Alloys1This
standard is issued under the fixed designation E426; 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. This standard has been
approved for use by agencies of the U.S. Department of
Defense.Scope*A
Summary of Changes section appears at the end of this
standard.This
practice2
covers procedures for eddy current examination of seamless and welded
tubular products made of relatively low conductivity materials such as
titanium, stainless steel, and similar alloys, such as nickel alloys.
Austenitic chromium-nickel stainless steels, which are generally
considered to be nonmagnetic, are specifically covered as distinguished
from the martensitic and ferritic straight chromium stainless steels
which are
magnetic.This
practice is intended as a guide for eddy current examination of both
seamless and welded tubular products using either an encircling coil or
a probe-coil technique. Coils and probes are available that can be used
inside the tubular product; however, their use is not specifically
covered in this document. This type of examination is usually employed
only to examine tubing which has been installed such as in a heat
exchanger.This
practice covers the examination of tubular products ranging in diameter
from 0.125 to 5 in. (3.2 to 127.0 mm) and wall thicknesses from 0.005
to 0.250 in. (0.127 to 6.4
mm).For
examination of aluminum alloy tubular products, see standard Practice
E215.Units—The
values stated in inch-pound units are to be regarded as standard. The
values given in parentheses are mathematical conversions to SI units
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
that are provided for information only and are not considered
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
standard.This
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
standard does not purport to address all of the safety problems, if
1 4
This practice is under the jurisdiction of ASTM Committee E07 on Nonde- Available from American Society for Nondestructive Testing (ASNT), P.O. Box
structiveany, associatedTesting and is thewithdirectitsresponsibilityuse. It isof Subcommitteethe responsibilityE07.07 on of28518,the171user1 Arlingateof Ln., Columbus, OH 43228-0518, http://www.asnt.org.
5
Electromagnetic Method. Available from Aerospace Industries Association of America, Inc. (AIA), 1000
this standard to establish appropriate safety and health practices and
Current edition approved Dec. 1, 2016. Published December 2016. Originally Wilson Blvd., Suite 1700, Arlington, VA 22209-3928, http://www.aia-aerospace.org.
approved in 1971. Last previous edition approved in 2012 as E426 – 12. DOI:
determine the applicability of regulatory limitations prior to
6
10.1520/E0426-16. Available from International Organization for Standardization (ISO), ISO
2
use.Referenced
For ASME Boiler and Pressure Vessel Code applications see related Practice Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier,
SE-426 in Section II of that Code. Geneva, Switzerland, http://www.iso.org.
DocumentsASTM
Standards:3E215Practice
for Standardizing Equipment for Electromagnetic Testing of Seamless
*A Summary of Changes section appears at the end of this standard
Aluminum-Alloy
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
TubeE543Specification
1
for Agencies Performing Nondestructive
TestingE1316Terminology

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E426 − 16
examination of the tube and/or weld may be made. The depth
of penetration of the interrogating magnetic fields into the
tubular product may be smaller for this type of probe coil
compared to the encircling coil.
5. Significance and Use
5.1 Eddy current testing is a nondestructive method of
locating discontinuities in a product. Changes in electromag-
netic response caused by the presence of discontinuities are
detected by the sensor, amplified and modified in order to
actuate audio or visual indicating devices, or both, or a
mechanical marker. Signals can be caused by outer surface,
inner surface, or subsurface discontinuities. The eddy current
examination is sensitive to many factors tha
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: E426 − 12 E426 − 16
Standard Practice for
Electromagnetic (Eddy-Current) (Eddy Current) Examination
of Seamless and Welded Tubular Products, Titanium,
1
Austenitic Stainless Steel and Similar Alloys
This standard is issued under the fixed designation E426; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
2
1.1 This practice covers procedures for eddy-current eddy current examination of seamless and welded tubular products made
of relatively low conductivity materials such as titanium, stainless steel, and similar alloys, such as nickel alloys. Austenitic
chromium-nickel stainless steels, which are generally considered to be nonmagnetic, are specifically covered as distinguished from
the martensitic and ferritic straight chromium stainless steels which are magnetic.
1.2 This practice is intended as a guide for eddy-current eddy current examination of both seamless and welded tubular products
using either an encircling coil or a probe-coil technique. Coils and probes are available that can be used inside the tubular product;
however, their use is not specifically covered in this document. This type of examination is usually employed only to examine
tubing which has been installed such as in a heat exchanger.
1.3 This practice covers the examination of tubular products ranging in diameter from 0.125 to 5 in. (3.2 to 127.0 mm) and wall
thicknesses from 0.005 to 0.250 in. (0.127 to 6.4 mm).
1.4 For examination of aluminum alloy tubular products, see standard Practice E215.
1.5 Units—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.
1.6 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
3
2.1 ASTM Standards:
E215 Practice for Standardizing Equipment for Electromagnetic Testing of Seamless Aluminum-Alloy Tube
E543 Specification for Agencies Performing Nondestructive Testing
E1316 Terminology for Nondestructive Examinations
2.2 Other Documents:
4
SNT-TC-1A Recommended Practice for Personnel Qualification and Certification in Nondestructive Testing
4
ANSI/ASNT CP-189 ASNT Standard for Qualification and Certification of Nondestructive Testing Personnel
5
NAS-410 NAS Certification and Qualification of Nondestructive Personnel (Quality Assurance Committee)
6
ISO 9712 Non-Destructive Testing—Certification and Qualification of NDT Personnel
1
This practice is under the jurisdiction of ASTM Committee E07 on Nondestructive Testing and is the direct responsibility of Subcommittee E07.07 on Electromagnetic
Method.
Current edition approved Aug. 1, 2012Dec. 1, 2016. Published September 2012December 2016. Originally approved in 1971. Last previous edition approved in 20072012
as E426 – 98 (2007).E426 – 12. DOI: 10.1520/E0426-12.10.1520/E0426-16.
2
For ASME Boiler and Pressure Vessel Code applications see related Practice SE-426 in Section II of that Code.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
4
Available from American Society for Nondestructive Testing (ASNT), P.O. Box 28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http://www.asnt.org.
5
Available from Aerospace Industries Association of America, Inc. (AIA), 1000 Wilson Blvd., Suite 1700, Arlington, VA 22209-3928, http://www.aia-aerospace.org.
6
Available from International Organization for Standardization (ISO), ISO Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier, Geneva,
Switzerland, http://www.iso.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
1

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E426 − 16
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