ASTM A721-97

Standard Test Method for Ductility of Oriented Electrical Steel

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 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.  
1.3 The values stated in inch-pound units are to be regarded as standard. The values stated in SI units, shown in parentheses, are for information only.

General Information

• Status: Historical
• Publication Date: 09-Oct-1997
• ICS: 77.140.50 - Flat steel products and semi-products
• Technical Committee: A06 - Magnetic Properties
• Drafting Committee: A06.01 - Test Methods

Relations

• Replaced By: ASTM A721/A721M-02 - Standard Test Method for Ductility of Oriented Electrical Steel
• Effective Date: 10-Oct-2002

Standards Content (Sample)

Designation: A 721 – 97 An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
1
Ductility of Oriented Electrical Steel
This standard is issued under the fixed designation A 721; 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 thicknesses and widths up to 36 in. [910 mm].
1.1 This test method covers determination of the ductility of
5. Apparatus
grain-oriented silicon steel by use of an apparatus known
5.1 The machine required to perform this test is known
variously as a tinner’s brake, hand folder, or an apron brake.
variously as a tinner’s brake, hand folder, or an apron brake.
1.2 This standard does not purport to address all of the
5.2 The brake shall be at least 36 in. [910 mm] wide with an
safety concerns, if any, associated with its use. It is the
opening capacity of approximately 0.035 in. [0.9 mm].
responsibility of the user of this standard to establish appro-
5.2.1 The nose bar shall have a 0.031-in. [0.8-mm] radius.
priate safety and health practices and determine the applica-
5.2.2 The bending bar must be movable through an angle of
bility of regulatory limitations prior to use.
at least 160°.
1.3 The values stated in either customary (cgs-emu and
5.2.3 The movable table or apron shall move around the end
inch-pound) units or SI units are to be regarded separately as
of the nose bar at a distance of approximately 0.25 in. [6.35
standard. Within the text, the SI units are shown in brackets.
mm].
The values stated in each system are not exact equivalents;
therefore, each system shall be used independently of the other.
6. Test Specimen
Combining values from the two systems may result in noncon-
6.1 Two specimens are required and they shall be selected
formance with this test method.
from the same general location as that of the magnetic test
specimens in accordance with Practice A 34.
2. Referenced Documents
6.2 The specimens shall be cut transversely to the rolling
2.1 ASTM Standards:
direction and have a length equal to the sheet or strip width and
A 34 Practice for Sampling and Procurement Testing of
2
a minimum dimension of 3 in. [80 mm] in the direction of
Magnetic Materials
rolling.
A 876/A 876M Specification for Flat-Rolled, Grain-
6.3 The specimens shall be free of rust, ripples, and
Oriented, Silicon-Iron, Electrical Steel, Fully Processed
2 scratches.
Types
E 290 Test Methods for Bend Testing of Material for
7. Procedure
3
Ductility
7.1 The test specimen shall be at a temperature of 25 6 5°C
at the start of the test.
3. Summary of Test Method
7.2 Insert the test specimen into the brake and clamp with
3.1 A test specimen representing the full width of grain-
the direction of rolling perpendicular to the nose bar and 0.5 to
oriented steel to be tested is bent through an angle of about
1.5 in. [12 to 40 mm] under the nose bar thereby allowing the
160° in a tinner’s brake. The number of breaks, or fractures,
balance of the specimen width to rest against the bending bar.
occurring along the bend determines the ductility class rating.
7.3 Bend the s
...