ASTM A721/A721M-02(2007)
(Test Method)Standard Test Method for Ductility of Oriented Electrical Steel
Standard Test Method for Ductility of Oriented Electrical Steel
SIGNIFICANCE AND USE
This is a specialized bend test for grain-oriented steel not covered under the provisions of Test Methods E 290.
This test is applicable to grain-oriented silicon steel such as covered in Specifications A 876/A 876M in commercial thicknesses and widths up to 36 in. [910 mm].
SCOPE
1.1 This test method covers determination of the ductility of grain-oriented silicon steel by use of an apparatus known variously as a tinner's brake, hand folder, or an apron brake.
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.
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Designation: A721/A721M – 02 (Reapproved 2007)
Standard Test Method for
Ductility of Oriented Electrical Steel
This standard is issued under the fixed designationA721/A721M; 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 4.2 Thistestisapplicabletograin-orientedsiliconsteelsuch
as covered in Specification A876 in commercial thicknesses
1.1 This test method covers determination of the ductility of
and widths up to 36 in. [910 mm].
grain-oriented silicon steel by use of an apparatus known
variously as a tinner’s brake, hand folder, or an apron brake.
5. Apparatus
1.2 The values and equations stated in customary (cgs-emu
5.1 The machine required to perform this test is known
and inch-pound) or SI units are to be regarded separately as
variously as a tinner’s brake, hand folder, or an apron brake.
standard. Within this test method, SI units are shown in
5.2 The brake shall be at least 36 in. [910 mm] wide with an
brackets. The values stated in each system may not be exact
opening capacity of approximately 0.035 in. [0.9 mm].
equivalents;therefore,eachsystemshallbeusedindependently
5.2.1 The nose bar shall have a 0.031-in. [0.8-mm] radius.
of the other. Combining values from the two systems may
5.2.2 The bending bar must be movable through an angle of
result in nonconformance with this test method.
at least 160°.
1.3 This standard does not purport to address all of the
5.2.3 The movable table or apron shall move around the end
safety concerns, if any, associated with its use. It is the
of the nose bar at a distance of approximately 0.25 in. [6.35
responsibility of the user of this standard to establish appro-
mm].
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
6. Test Specimen
2. Referenced Documents 6.1 Two specimens are required and they shall be selected
2 from the same general location as that of the magnetic test
2.1 ASTM Standards:
specimens in accordance with Practice A34/A34M.
A34/A34M Practice for Sampling and Procurement Testing
6.2 The specimens shall be cut transversely to the rolling
of Magnetic Materials
direction and have a length equal to the sheet or strip width and
A876 Specification for Flat-Rolled, Grain-Oriented,
a minimum dimension of 3 in. [80 mm] in the direction of
Silicon-Iron, Electrical Steel, Fully Processed Types
rolling.
E290 Test Methods for Bend Testing of Material for Duc-
6.3 The specimens shall be free of rust, ripples, and
tility
scratches.
3. Summary of Test Method
7. Procedure
3.1 A test specimen representing the full width of grain-
7.1 The test specimen shall be at a temperature of 25 6 5°C
oriented steel to be tested is bent through an angle of about
at the start of the test.
160° in a tinner’s brake. The number of breaks, or fractures,
7.2 Insert the test specimen into the brake and clamp with
occurring along the bend determines the ductility class rating.
the direction of rolling perpendicular to the nose bar and 0.5 to
4. Significance and Use 1.5 in. [12 to 40 mm] under the nose bar thereby allowing the
balance of the specimen width to rest against the bending bar.
4.1 This is a specialized bend test for grain-oriented steel
7.3 Bend the specimen around the nose bar at a uniform rate
not covered under the provisions of Test Methods E290.
by rotating the bending bar through an angle of 160°.
7.4 Remove the specimen from t
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