ASTM A720/A720M-02(2016)e1

Standard Test Method for Ductility of Nonoriented Electrical Steel

SIGNIFICANCE AND USE
4.1 This is a specialized bend test for nonoriented electrical steel not covered under the provisions of Test Methods E290.  
4.2 This test is applicable to nonoriented silicon steel such as described in Specifications A677 and A683 in commercial thicknesses.  
4.3 It is not intended to be applied to steels considered inherently ductile.
SCOPE
1.1 This test method covers determination of ductility utilizing Epstein test strips and a bending device for bending the strip over a predetermined radius. It is intended for commercial silicon-bearing steel sheet or strip of nonoriented types in the thickness range from 0.010 to 0.031 in. [0.25 to 0.79 mm], inclusive.  
1.2 The values and equations stated in customary (cgs-emu and inch-pound) or SI units are to be regarded separately as standard. Within this test method, SI units are shown in brackets. 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 this test method.  
1.3 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.

General Information

• Status: Historical
• Publication Date: 31-Mar-2016
• ICS: 77.140.50 - Flat steel products and semi-products
• Technical Committee: A06 - Magnetic Properties
• Drafting Committee: A06.01 - Test Methods

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: A720/A720M − 02 (Reapproved 2016)
Standard Test Method for
Ductility of Nonoriented Electrical Steel
This standard is issued under the fixed designationA720/A720M; 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.
ε NOTE—Editorially corrected designation in 2.1 in April 2016.
1. Scope 3. Summary of Test Method
3.1 A test strip is placed in the special test apparatus
1.1 This test method covers determination of ductility uti-
designed to clamp one end of the specimen securely while the
lizing Epstein test strips and a bending device for bending the
other end is free to move, but held in tension by a spring. The
strip over a predetermined radius. It is intended for commercial
specimen is repeatedly bent through 180° reversals until a
silicon-bearing steel sheet or strip of nonoriented types in the
crack appears at the bend or until sudden failure occurs by
thickness range from 0.010 to 0.031 in. [0.25 to 0.79 mm],
complete rupture.The number of reversals until failure is taken
inclusive.
as a measure of the ductility.
1.2 The values and equations stated in customary (cgs-emu
and inch-pound) or SI units are to be regarded separately as
4. Significance and Use
standard. Within this test method, SI units are shown in
4.1 This is a specialized bend test for nonoriented electrical
brackets. The values stated in each system may not be exact
steel not covered under the provisions of Test Methods E290.
equivalents;therefore,eachsystemshallbeusedindependently
of the other. Combining values from the two systems may 4.2 This test is applicable to nonoriented silicon steel such
result in nonconformance with this test method.
as described in Specifications A677 and A683 in commercial
thicknesses.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 4.3 It is not intended to be applied to steels considered
responsibility of the user of this standard to establish appro- inherently ductile.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 5. Apparatus
5.1 The apparatus, Fig. 1, consists of a set of stationary jaws
2. Referenced Documents
and a movable arm to which is attached another set of jaws and
a spring.
2.1 ASTM Standards:
5.1.1 The stationary jaws shall have working edges with
A34/A34M Practice for Sampling and Procurement Testing
radii of approximately 0.2 in. [5 mm] over which the test
of Magnetic Materials
specimen is bent. Stationary jaws shall be of the quick-
A677 Specification for Nonoriented Electrical Steel Fully
clamping type.
Processed Types
5.1.2 The jaws attached to the movable arm shall allow the
A683 Specification for Nonoriented Electrical Steel, Semi-
specimen to move freely during bending.
processed Types
5.1.3 The spring clamped to the free end of the specimen
E290 Test Methods for Bend Testing of Material for Ductil-
ity shall provide sufficient tension in the specimen to localize the
bend.
5.1.4 Design of the movable arm shall permit a rotation of
approximately 180°.
This test method is under the jurisdiction of ASTM Committee A06 on
MagneticPropertiesandisthedirectresponsibilityofSubcommitteeA06.01onTest
Methods.
6. Sampling
Current edition approved April 1, 2016. Published April 2016. Originally
6.1 Select samples from at least two well separated loca-
approved in 1975. Last previous edition approved in 2011 as A720/A720M – 02
(2011). DOI: 10.1520/A0720_A0720M-02R16E01.
tions in each test lot or lift.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1.1 The test specimens may be cut from samples used for
contact ASTM Customer Service at [e-mail]. For A
...

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.
´1
Designation: A720/A720M − 02 (Reapproved 2011) A720/A720M − 02 (Reapproved 2016)
Standard Test Method for
Ductility of Nonoriented Electrical Steel
This standard is issued under the fixed designation A720/A720M; 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.
ε NOTE—Editorially corrected designation in 2.1 in April 2016.
1. Scope
1.1 This test method covers determination of ductility utilizing Epstein test strips and a bending device for bending the strip over
a predetermined radius. It is intended for commercial silicon-bearing steel sheet or strip of nonoriented types in the thickness range
from 0.010 to 0.031 in. [0.25 to 0.79 mm], inclusive.
1.2 The values and equations stated in customary (cgs-emu and inch-pound) or SI units are to be regarded separately as
standard. Within this test method, SI units are shown in brackets. 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 this test method.
1.3 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.
2. Referenced Documents
2.1 ASTM Standards:
A34/A34M Practice for Sampling and Procurement Testing of Magnetic Materials
A677 Specification for Nonoriented Electrical Steel Fully Processed Types
A683/A683MA683 Specification for Nonoriented Electrical Steel, Semiprocessed Types
E290 Test Methods for Bend Testing of Material for Ductility
3. Summary of Test Method
3.1 A test strip is placed in the special test apparatus designed to clamp one end of the specimen securely while the other end
is free to move, but held in tension by a spring. The specimen is repeatedly bent through 180° reversals until a crack appears at
the bend or until sudden failure occurs by complete rupture. The number of reversals until failure is taken as a measure of the
ductility.
4. Significance and Use
4.1 This is a specialized bend test for nonoriented electrical steel not covered under the provisions of Test Methods E290.
4.2 This test is applicable to nonoriented silicon steel such as described in Specifications A677 and A683/A683MA683 in
commercial thicknesses.
4.3 It is not intended to be applied to steels considered inherently ductile.
5. Apparatus
5.1 The apparatus, Fig. 1, consists of a set of stationary jaws and a movable arm to which is attached another set of jaws and
a spring.
5.1.1 The stationary jaws shall have working edges with radii of approximately 0.2 in. [5 mm] over which the test specimen
is bent. Stationary jaws shall be of the quick-clamping type.
This test method is under the jurisdiction of ASTM Committee A06 on Magnetic Properties and is the direct responsibility of Subcommittee A06.01 on Test Methods.
Current edition approved Oct. 1, 2011April 1, 2016. Published October 2011April 2016. Originally approved in 1975. Last previous edition approved in 20072011 as
A720/A720M – 02 (2011).(2007). DOI: 10.1520/A0720_A0720M-02R11.10.1520/A0720_A0720M-02R16E01.
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.
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A720/A720M − 02 (2016
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