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ASTM A971-00

(Test Method)

Standard Test Method for Measuring Edge Taper and Crown of Flat-Rolled Electrical Steel Coils

Standard Test Method for Measuring Edge Taper and Crown of Flat-Rolled Electrical Steel Coils

SCOPE
1.1 This test method provides a procedure for measuring edge taper and crown of flat-rolled electrical steel coils as produced at the steel mill.
1.2 The values stated in either customary (cgs-emu and inch-pound) units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not 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 The following material specifications include requirements for edge taper or crown: A677, A677M, A683/A683M, A726, A840, A840M, and A876/A876M.
1.4This 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-Jul-2000
ICS
77.140.50 - Flat steel products and semi-products
Technical Committee
A06 - Magnetic Properties
Drafting Committee
A06.01 - Test Methods
Current Stage
Ref Project

Relations

Replaced By
ASTM A971/A971M-05 - Standard Test Method for Measuring Edge Taper and Crown of Flat-Rolled Electrical Steel Coils
Effective Date
15-Dec-2005
Referred By
ASTM A683-16 - Standard Specification for Nonoriented Electrical Steel, Semiprocessed Types
Effective Date
10-Jul-2000

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ASTM A971-00 - Standard Test Method for Measuring Edge Taper and Crown of Flat-Rolled Electrical Steel CoilsASTM A971-00 - Standard Test Method for Measuring Edge Taper and Crown of Flat-Rolled Electrical Steel Coils
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ASTM A971-00 - Standard Test Method for Measuring Edge Taper and Crown of Flat-Rolled Electrical Steel Coils
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 971 – 00
Standard Test Method for
Measuring Edge Taper and Crown of Flat-Rolled Electrical
Steel Coils
This standard is issued under the fixed designation A 971; 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 A 876/A 876M Specification for Flat-Rolled, Grain-
Oriented, Silicon Iron, Electrical Steel, Fully Processed
1.1 This test method provides a procedure for measuring
Types
edge taper and crown of flat-rolled electrical steel coils as
produced at the steel mill.
3. Terminology
1.2 The values stated in either customary (cgs-emu and
3.1 Definitions: Except as defined as follows, the symbols
inch-pound) units or SI units are to be regarded separately as
and terminology used in this test method are defined in
standard. Within the text, the SI units are shown in brackets.
Terminology A 340.
The values stated in each system are not exact equivalents;
3.1.1 edge taper and crown—the variations of thickness
therefore, each system shall be used independently of the other.
across the widths of cold-rolled steel coils, that is, perpendicu-
Combining values from the two systems may result in noncon-
lar to the rolling direction. Edge taper slope (g) is expressed in
formance with this test method.
ten thousandths of an inch per inch (ten thousandths of a
1.3 The following material specifications include require-
millimetre per millimetre).
ments for edge taper or crown: A 677, A 677M, A 683/
3.1.1.1 Discussion—The variation of thickness from the
A 683M, A 726, A 840, A 840M, and A 876/A 876M.
edge to approximately 4 in. [100 mm] from the edge of the coil
1.4 This standard does not purport to address all of the
is called edge taper. The variation of thickness from the center
safety concerns, if any, associated with its use. It is the
to the edge is called crown.
responsibility of the user of this standard to establish appro-
3.1.1.2 Discussion—Edge taper and crown are not the same
priate safety and health practices and determine the applica-
as thickness variation. Thickness variation is measured parallel
bility of regulatory limitations prior to use.
to the rolling direction (although it is loosely defined as
2. Referenced Documents variation in any direction).
3.1.2 edge trimming—the slitting of a narrow strip from
2.1 ASTM Standards:
each edge of the master coil for discard. This reduces the edge
A 340 Terminology of Symbols and Definitions Relating to
2 taper gamma on the remainder of the master coil.
Magnetic Testing
3.1.3 master coils—full-width coils as produced by cold-
A 677 Specification for Nonoriented Electrical Steel, Fully
2 rolling mills. Slit coils are narrower width coils slit from a
Processed Types
master coil. A coupon is a full-width piece of the master coil,
A 677M Specification for Nonoriented Electrical Steel,
2 usually manually cut off for test purposes. A sample strip 1 to
Fully Processed Types (Metric)
4 in. [25 to 102 mm] wide is sheared across the width of the
A 683/A 683M Specification for Nonoriented Electrical
2 coilfromacouponforthepurposeofmeasuringedgetaperand
Steel, Semiprocessed Types
crown. This is called a gamma strip because gamma (g)isthe
A 726 Specification for Cold-Rolled Magnetic Lamination
symbol used to quantify edge taper slope or rate of variation
Quality Steel, Semiprocessed Types
with distance. See Fig. 1.
A 840 Specification for Fully Processed Magnetic Lamina-
tion Steel
4. Summary of Test Method
A 840M Specification for Fully Processed Magnetic Lami-
4.1 In determining the edge taper and crown, a sample
nation Steel (Metric)
gamma strip is taken from the coil head and tail. Thickness
readings are taken using a micrometer or other measuring
This test method is under the jurisdiction of ASTM Committee A–6 on device along a single line perpendicular to the rolling direction
Magnetic Properties and is the direct responsibility of SubcommitteeA06.01 onTest 3 3 3 3
⁄8,1 ⁄8,2 ⁄8, and 4 ⁄8 in. [10, 35, 60, and 111 mm]
at points
Methods.
from each edge to determine edge taper and in the center to
Current edition approved June 10, 2000. Published September 2000. Originally
determine crown. The readings are recorded, and variations
published as A 971 – 97. Last previous edition A 971 – 97.
Annual Book of ASTM Standards, Vol 03.04.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
A 971
FIG. 1 Typical Steel Mill Coil Thickness Profile across Width of Coil
between the readings calculated. If the edge taper is greater is used to cut a gamma strip from the coupon.The shear can be
than specified, edge trimming can be performed to meet the fitted with an edge guide or other means to establish a strip
limits agreed upon between the producer and the purchaser. perpendicular to the coil edges. Perpendicularity shall be
within 1°. See Fig. 2.
5. Significance and Use
7.2 Means for locating and marking the gamma strip mea-
5.1 Flat-rolled electrical steel master coils are usually slit
surement points shall be provided.Atemplate can be made that
into narrower coils. Usually these slit coils are punched or will quickly locate for marking the test points from each edge.
shearedintolaminationsofvariousshapes.Thelaminationsare
The center point can be located with a scale. Points shall be
then uniformly stacked to become the cores of magnetic locate
...

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This specification covers the detailed requirements for specified grades of flat-rolled, grain-oriented, fully processed low-carbon silicon-iron electrical steels, whose low core loss and high permeability in the direction of rolling have been achieved by appropriate metallurgical processing. These steels are primarily used in transformer cores operating at moderate to high magnetic flux densities at commercial power frequencies. These steels may be acquired in any of four conditions a.) conventional grain-oriented tested at 15 kG (1.5 T), b.) conventional grain-oriented tested at 17 kG (1.7 T), c.) high-permeability grain-oriented tested at 17 kG (1.7 T) and d.) laser-scribed high-permeability grain-oriented tested at 17 kG (1.7 T). These steels can be purchased in a number of combinations of material form and surface type or treatment. This specification explains in detail, the available forms, thicknesses and magnetic performance.
SCOPE
1.1 This specification covers the detailed requirements to which the specified grades of flat-rolled, grain-oriented, fully processed electrical steels shall conform. These steels are used primarily in transformer cores operating at moderate to high magnetic flux densities at commercial power frequencies (50 and 60 Hz).  
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This specification covers four grades of carbon steel plates of structural quality for general application. Steel samples shall be melt processed by either open-hearth, basic-oxygen, or electric furnace. Heat and product analysis shall be performed wherein steel materials shall conform to required chemical compositions of carbon, manganese, phosphorus, sulfur, silicon, and copper. Steel specimens shall also undergo tensile tests and shall conform to required values of tensile strength, yield point, and elongation.
SCOPE
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1.5 This specification contains notes or footnotes, or both, that provide explanatory material. Such notes and footnotes, excluding those in tables and figures, do not contain any mandatory requirements.  
1.6 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.

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