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ASTM A840/A840M-00(2006)

(Specification)

Standard Specification for Fully Processed Magnetic Lamination Steel (Withdrawn 2011)

Standard Specification for Fully Processed Magnetic Lamination Steel (Withdrawn 2011)

ABSTRACT
This specification covers standard requirements for flat-rolled carbon steel used in the fully processed condition in magnetic lamination applications. Steels supplied to this specification normally do not require further heat treatment by the user. There are no chemical requirements for these lamination steels. Instead the steels shall be produced to specified maximum core-loss values. Steels produced to this specification are available in thicknesses of 0.0185 in. (0.47 mm) and 0.025 in. (0.64 mm). For each thickness there are two core-loss types. The core loss is determined using the Epstein test method at a frequency of 60 Hz and a maximum flux density of 15 kG. In addition to the magnetic property requirements, dimensional tolerances, lamination factors and mechanical hardnesses are specified.
SCOPE
1.1 This specification covers cold-rolled carbon steel coils or strip used in the fully processed condition in magnetic lamination applications.
1.2 This steel is produced to specified maximum core-loss values and is intended primarily for commercial power frequency (50- and 60-Hz) applications in magnetic devices. Desirable core-loss and permeability characteristics are developed during mill processing, so further heat treatment by the purchaser is not necessary for most uses.
1.3 Fully processed magnetic lamination steels are flat-rolled low carbon iron alloys having 1 % maximum silicon and 0.4 % maximum aluminum.
1.4 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.
WITHDRAWN RATIONALE
This specification covers cold-rolled carbon steel coils or strip used in the fully processed condition in magnetic lamination applications.
Formerly under the jurisdiction of Committee A06 on Magnetic Properties, this specification was withdrawn in May 2011. This standard is being withdrawn with no replacement because of a lack of commercial/technical interest.

General Information

Status
Withdrawn
Publication Date
31-Dec-2005
Withdrawal Date
30-Apr-2011
ICS
77.140.50 - Flat steel products and semi-products
Technical Committee
A06 - Magnetic Properties
Drafting Committee
A06.02 - Material Specifications
Current Stage
Ref Project

Relations

Replaces
ASTM A840/A840M-00 - Standard Specification for Fully Processed Magnetic Lamination Steel
Effective Date
01-Jan-2006
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-Jan-2006

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ASTM A840/A840M-00(2006) - Standard Specification for Fully Processed Magnetic Lamination Steel (Withdrawn 2011)ASTM A840/A840M-00(2006) - Standard Specification for Fully Processed Magnetic Lamination Steel (Withdrawn 2011)
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ASTM A840/A840M-00(2006) - Standard Specification for Fully Processed Magnetic Lamination Steel (Withdrawn 2011)
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
Designation: A 840/A 840M – 00 (Reapproved 2006)
Standard Specification for
1
Fully Processed Magnetic Lamination Steel
ThisstandardisissuedunderthefixeddesignationA840/A840M;thenumberimmediatelyfollowingthedesignationindicatestheyear
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (ϵ) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 This specification covers cold-rolled carbon steel coils 3.1 The terms and symbols used in this specification are
or strip used in the fully processed condition in magnetic defined in Terminology A340A340.
lamination applications.
4. Classification
1.2 This steel is produced to specified maximum core-loss
values and is intended primarily for commercial power fre- 4.1 The fully processed magnetic lamination steel types
described by this specification are as shown in Table 1.
quency (50- and 60-Hz) applications in magnetic devices.
Desirable core-loss and permeability characteristics are devel-
5. Ordering Information
oped during mill processing, so further heat treatment by the
5.1 Ordersformaterialunderthisspecificationshallinclude
purchaser is not necessary for most uses.
as much of the following information as necessary to describe
1.3 Fully processed magnetic lamination steels are flat-
the desired material adequately:
rolledlowcarbonironalloyshaving1%maximumsiliconand
5.1.1 ASTM specification number.
0.4% maximum aluminum.
5.1.2 Name of material (fully processed magnetic lamina-
1.4
tion steel).
2. Referenced Documents
5.1.3 ASTM core-loss type number.
2
2.1 ASTM Standards: 5.1.4 Thickness, width and length (if in cut lengths instead
of coils).
A34/A34M Practice for Sampling and Procurement Testing
of Magnetic Materials 5.1.5 Total weight of ordered item.
5.1.6 Limitations in coil size or lift weights.
A340 Terminology of Symbols and Definitions Relating to
Magnetic Testing 5.1.7 End Use—The purchaser shall disclose as much
A343/A343M Test Method for Alternating-Current Mag- pertinent information as possible about the intended applica-
tion to enable the supplier to provide material characteristics
netic Properties of Materials at Power Frequencies Using
Wattmeter-Ammeter-VoltmeterMethodand25-cmEpstein most suitable for specific fabricating practices.
5.1.8 Special requirements or exceptions to the provisions
Test Frame
A664 PracticeforIdentificationofStandardElectricalSteel of this specification.
Grades in ASTM Specifications
6. Manufacture
A700 PracticesforPackaging,Marking,andLoadingMeth-
6.1 Melting Practice:
ods for Steel Products for Shipment
6.1.1 These fully processed magnetic lamination steels may
A719/A719M Test Method for Lamination Factor of Mag-
be made by basic oxygen, electric furnace, or other steelmak-
netic Materials
ing practices.
6.1.2 Thesesteelstypicallycontainlessthan0.03%carbon.
1
This specification is under the jurisdiction of ASTM Committee A06 on
6.1.3 The addition of silicon, aluminum, manganese, and
Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on
phosphorus may be used to enhance punchability and improve
Material Specifications.
magnetic properties by increasing electrical resistivity. The
Current edition approved Jan. 1, 2006. Published January 2006. Originally
approved in 1985. Last previous edition approved in 2000 as A840/A840M–00.
alloy additions are usually restricted such that the density of
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 3 3
these steels is maintained above 7.825 g/cm (7825 kg/m ).
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1.4 Residual elements such as copper, nickel, chromium,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. molybdenum, and tin should be held as low as practicable.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
A 840/A 840M – 00 (2006)
A B C
TABLE 1 Core-Loss Types and Maximum Core-Loss Values at 15 kG (1.5 T) and 60 Hz for As-Sheared Epstein Specimens
Strip Thickness, Maximum Core Loss
Typical Relative Peak
A
ASTM Core-Loss Type
Permeability
in. (mm) W/lb (W/kg)
47C550 0.0185 (0.47) 5.50 (12.13) 1150
47C600 6.00 (13.23) 1300
64C700 0.025 (0.64) 7.00 (15.43) 1250
64C750 7.50 (16.53) 1400
A
See Practice A 664A664.
B
Maximum core losses at 15 kG (1.5 T) and 50 Hz are 0.79 times maximum core loss at 60 Hz.
C
One half of the strips cut parallel to and one half of the s
...

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1.1 This specification covers the detailed requirements to which flat-rolled thin-gauge nonoriented fully processed electrical steel shall conform. Nominal thicknesses included in this specification are 0.10 mm (0.004 in.) to 0.30 mm (0.012 in.).  
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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. The ASTM core-loss type designations for the electrical steels covered here are 18G041, 23G045, 27G051, 30G058, 35G066, 23H070, 27H074, 30H083, 35H094, 23P060, 27P066, 23Q054, and 27Q057. Steels may be acquired in any of four conditions, classified according to a combination of material form and surface type or treatment as desired for the expected end use. Materials shall conform to specified values of magnetic properties (core loss, permeability, and magnetic aging), physical dimensions (thickness, length, and width), and mechanical properties (lamination factor and ductility).
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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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1.3 The electrical-steel grades described in this specification include (1) conventional grain-oriented electrical steel tested at 1.5 T (15 kG) in accordance with Test Method A343/A343M, (2) conventional grain-oriented electrical steel tested at 1.7 T (17 kG) in accordance with Test Method A343/A343M, (3) high-permeability grain-oriented electrical steel tested at 1.7 T (17 kG) in accordance with Test Method A343/A343M, and (4) laser-scribed high-permeability grain-oriented electrical steel tested at 1.7 T (17 kG) in accordance with Test Methods A804/A804M.  
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ABSTRACT
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.
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1.5 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.  
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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4.3 It is not intended to be applied to steels considered inherently ductile.
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