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ASTM A726-05

(Specification)

Standard Specification for Cold-Rolled Magnetic Lamination Quality Steel, Semiprocessed Types

Standard Specification for Cold-Rolled Magnetic Lamination Quality Steel, Semiprocessed Types

ABSTRACT
This specification covers the standard requirements for semi-processed cold-rolled magnetic lamination quality steels. These steels shall be made by the basic-oxygen or electric-furnace method and shall be processed by hot rolling, pickling, cold rolling, annealing, and temper rolling. Magnetic lamination steels shall have low-carbon contents and may have manganese, phosphorus, silicon, and aluminum additions to enhance punchability and to improve magnetic characteristics by increasing the electrical resistivity. There are no fixed chemical requirements for these steels only the requirement to meet the specified magnetic properties. These steels must be heat treated by the user to develop the specified magnetic properties. This specification covered steels with thicknesses of 0.0185 in. ( 0.47 mm), 0.022 in. (0.56 mm), 0.025 in. (0.64 mm), 0.028 in. (0.71 mm) and 0.031 in. (0.79 mm). For a given thickness there are three or more core loss types distinguished by maximum allowable core loss after a specified quality development anneal. Magnetic testing shall be done after the specified quality development anneal and shall use the Epstein test method. Magnetic testing shall be done at a test frequency of 60 Hz and a maximum flux density of 15 kG (1.5 T). Test methods to determine the magnetic and mechanical properties are listed. Other typical magnetic and physical properties are listed for reference.
SCOPE
1.1 This specification covers cold-rolled carbon sheet steel used for magnetic applications. These products, commonly called "cold-rolled magnetic lamination steel" (CRML) are usually intended for applications in which the stamped laminations or assembled core structures for electrical equipment are annealed to develop the desired core loss and permeability characteristics.
1.2 By using appropriate lamination annealing practices, the user can optimize magnetic properties for the various types.
1.3 Non-guaranteed core-loss types, usually made to controlled chemical compositions, are available but are not covered by this specification.
1.4 Higher quality core-loss types are made to controlled chemical compositions and are usually given a critical reduction on a temper-mill to yield specified magnetic properties after a suitable lamination anneal. These products, typically called semiprocessed lamination steel, are classified by the ASTM Code Letter D in accordance with Practice A 664.
1.5 The values stated in customary (cgs-emu and inch-pound) units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units which are provided for information only and are not considered standard.

General Information

Status
Historical
Publication Date
30-Nov-2005
Technical Committee
A06 - Magnetic Properties
Drafting Committee
A06.02 - Material Specifications
Current Stage
Ref Project

Relations

Replaces
ASTM A726-00 - Standard Specification for Cold-Rolled Magnetic Lamination Quality Steel, Semiprocessed Types
Effective Date
01-Dec-2005
Replaced By
ASTM A726-05(2010) - Standard Specification for Cold-Rolled Magnetic Lamination Quality Steel, Semiprocessed Types
Effective Date
01-Nov-2010
Referred By
ASTM A1036-04(2020) - Standard Guide for Measuring Power Frequency Magnetic Properties of Flat-Rolled Electrical Steels Using Small Single Sheet Testers
Effective Date
01-Dec-2005
Referred By
ASTM A848-17 - Standard Specification for Low-Carbon Magnetic Iron
Effective Date
01-Dec-2005
Referred By
ASTM A664-15(2022) - Standard Practice for Identification of Standard Electrical Steel Grades in ASTM Specifications
Effective Date
01-Dec-2005
Referred By
ASTM A971/A971M-17(2022) - Standard Test Method for Measuring Edge Taper and Crown of Flat-Rolled Electrical Steel Coils
Effective Date
01-Dec-2005
Referred By
ASTM A976-18 - Standard Classification of Insulating Coatings for Electrical Steels by Composition, Relative Insulating Ability and Application
Effective Date
01-Dec-2005
Referred By
ASTM A867-19 - Standard Specification for Iron-Silicon Relay Steels
Effective Date
01-Dec-2005
Referred By
ASTM A345-19 - Standard Specification for Flat-Rolled Electrical Steels for Magnetic Applications
Effective Date
01-Dec-2005

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ASTM A726-05 - Standard Specification for Cold-Rolled Magnetic Lamination Quality Steel, Semiprocessed TypesASTM A726-05 - Standard Specification for Cold-Rolled Magnetic Lamination Quality Steel, Semiprocessed Types
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ASTM A726-05 - Standard Specification for Cold-Rolled Magnetic Lamination Quality Steel, Semiprocessed Types
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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: A726 – 05
Standard Specification for
Cold-Rolled Magnetic Lamination Quality Steel,
1
Semiprocessed Types
This standard is issued under the fixed designation A726; 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 A370 Test Methods and Definitions for Mechanical Testing
of Steel Products
1.1 This specification covers cold-rolled carbon sheet steel
A664 Practice for Identification of Standard Electrical Steel
used for magnetic applications. These products, commonly
Grades in ASTM Specifications
called “cold-rolled magnetic lamination steel” (CRML) are
A700 PracticesforPackaging,Marking,andLoadingMeth-
usually intended for applications in which the stamped lami-
ods for Steel Products for Shipment
nations or assembled core structures for electrical equipment
E18 Test Methods for Rockwell Hardness of Metallic Ma-
are annealed to develop the desired core loss and permeability
terials
characteristics.
E140 Hardness Conversion Tables for Metals Relationship
1.2 Byusingappropriatelaminationannealingpractices,the
Among Brinell Hardness, Vickers Hardness, Rockwell
user can optimize magnetic properties for the various types.
Hardness, Superficial Hardness, Knoop Hardness, and
1.3 Non-guaranteed core-loss types, usually made to con-
Scleroscope Hardness
trolled chemical compositions, are available but are not cov-
ered by this specification.
3. Terminology
1.4 Higher quality core-loss types are made to controlled
3.1 Definitions of Terms Specific to This Standard:
chemical compositions and are usually given a critical reduc-
3.1.1 cold-rolled sheet—sheet manufactured from hot-
tion on a temper-mill to yield specified magnetic properties
rolled descaled coils by cold reducing to the desired thickness,
after a suitable lamination anneal. These products, typically
generally followed by annealing to recrystallize the grain
called semiprocessed lamination steel, are classified by the
structure.Inthecaseofmagneticlaminationsteels,particularly
ASTM Code Letter D in accordance with Practice A664.
semiprocessed lamination steels, temper rolling is used after
1.5 The values stated in customary (cgs-emu and inch-
annealingtoenhanceflatnessandoptimizemagneticproperties
pound) units are to be regarded as standard. The values given
during the user’s lamination anneal.
in parentheses are mathematical conversions to SI units which
3.1.2 magnetic lamination steels—specialty cold-rolled car-
are provided for information only and are not considered
bon sheet steel melted to controlled levels of carbon with
standard.
additions of manganese, phosphorus, silicon, and aluminum.
2. Referenced Documents Residual elements are generally held as low as possible. The
2
appropriate chemical composition combined with controlled
2.1 ASTM Standards:
mill processing results in a carbon sheet steel having mechani-
A340 Terminology of Symbols and Definitions Relating to
cal properties and magnetic properties (after a quality devel-
Magnetic Testing
opment anneal) desired for electrical applications.
A343/A343M Test Method for Alternating-Current Mag-
3.2 Other terms and symbols used in this specification are
netic Properties of Materials at Power Frequencies Using
defined in Terminology A340.
Wattmeter-Ammeter-VoltmeterMethodand25-cmEpstein
Test Frame
4. Ordering Information
4.1 Orders for material under this specification shall include
1
This specification is under the jurisdiction of ASTM Committee A06 on
the following information, as required, to describe the required
Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on
material adequately:
Material Specifications.
4.1.1 ASTM specification number and date of issue.
Current edition approved Dec. 1, 2005. Published December 2005. Originally
approved in 1976. Last previous edition approved in 2000 as A726 – 00. DOI: 4.1.2 Core-loss type number.
10.1520/A0726-05.
4.1.3 Finish (indicate typical profilometer range, as re-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
quired) (see 10.2).
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
4.1.4 Specify not oiled or oiled, as required (see 10.4).
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
A726 – 05
4.1.5 Dimensions (nominal thickness and coil width) and magnetic lamination steels may have alloy contents with
3 3
tolerances, if not standard (see 9.
...

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7.5  
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Note 1: Specific test methods are applicable only to certain types of joint fillers, as stated herein.  
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