ASTM A721/A721M-02

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.

General Information

• Status: Historical
• Publication Date: 09-Oct-2002
• ICS: 77.140.50 - Flat steel products and semi-products
• Technical Committee: A06 - Magnetic Properties
• Drafting Committee: A06.01 - Test Methods

Relations

• Replaces: ASTM A721-97 - Standard Test Method for Ductility of Oriented Electrical Steel
• Effective Date: 10-Oct-2002
• Replaced By: ASTM A721/A721M-02(2007) - Standard Test Method for Ductility of Oriented Electrical Steel
• Effective Date: 01-Nov-2007
• Referred By: ASTM A876-17e1 - Standard Specification for Flat-Rolled, Grain-Oriented, Silicon-Iron, Electrical Steel, Fully Processed Types
• Effective Date: 10-Oct-2002
• Referred By: ASTM A345-19 - Standard Specification for Flat-Rolled Electrical Steels for Magnetic Applications
• Effective Date: 10-Oct-2002

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: A 721/A 721M – 02
Standard Test Method for
1
Ductility of Oriented Electrical Steel
This standard is issued under the fixed designationA 721/A 721M; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Significance and Use
1.1 This test method covers determination of the ductility of 4.1 This is a specialized bend test for grain-oriented steel
grain-oriented silicon steel by use of an apparatus known not covered under the provisions of Test Methods E 290.
variously as a tinner’s brake, hand folder, or an apron brake. 4.2 Thistestisapplicabletograin-orientedsiliconsteelsuch
1.2 The values and equations stated in customary (cgs-emu as covered in Specifications A 876/A 876M in commercial
and inch-pound) or SI units are to be regarded separately as thicknesses and widths up to 36 in. [910 mm].
standard. Within this test method, SI units are shown in
5. Apparatus
brackets. The values stated in each system may not be exact
5.1 The machine required to perform this test is known
equivalents;therefore,eachsystemshallbeusedindependently
of the other. Combining values from the two systems may variously as a tinner’s brake, hand folder, or an apron brake.
5.2 The brake shall be at least 36 in. [910 mm] wide with an
result in nonconformance with this test method.
1.3 This standard does not purport to address all of the opening capacity of approximately 0.035 in. [0.9 mm].
5.2.1 The nose bar shall have a 0.031-in. [0.8-mm] radius.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 5.2.2 The bending bar must be movable through an angle of
at least 160°.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 5.2.3 The movable table or apron shall move around the end
of the nose bar at a distance of approximately 0.25 in. [6.35
2. Referenced Documents
mm].
2.1 ASTM Standards:
6. Test Specimen
A 34/A 34M Practice for Sampling and Procurement Test-
2
ing of Magnetic Materials 6.1 Two specimens are required and they shall be selected
A 876/A 876M Specification for Flat-Rolled, Grain- from the same general location as that of the magnetic test
specimens in accordance with Practice A 34/A 34M.
Oriented, Silicon-Iron, Electrical Steel, Fully Processed
2
Types 6.2 The specimens shall be cut transversely to the rolling
direction and have a length equal to the sheet or strip width and
E 290 Test Methods for Bend Testing of Material for
3
Ductility a minimum dimension of 3 in. [80 mm] in the direction of
rolling.
3. Summary of Test Method
6.3 The specimens shall be free of rust, ripples, and
3.1 A test specimen representing the full width of grain- scratches.
oriented steel to be tested is bent through an angle of about
7. Procedure
160° in a tinner’s brake. The number of breaks, or fractures,
7.1 The test specimen shall be at a temperature of 25 6 5°C
occurring along the bend determines the ductility class rating.
at the start of the test.
7.2 Insert the test specimen into the brake and clamp with
1
This test method is under the jurisdiction of ASTM Committee A06 on
the direction of rolling perpendicular to the nose bar and 0.5 to
Magnetic Properties and is the
...