ASTM A901-19
(Specification)Standard Specification for Amorphous Magnetic Core Alloys, Semi-Processed Types
Standard Specification for Amorphous Magnetic Core Alloys, Semi-Processed Types
ABSTRACT
This specification covers the requirements to which flat-cast, amorphous, semi-processed, iron-base magnetic core alloys must conform. These alloys shall be produced by a rapid-quenching, direct-casting process, resulting in metals with noncrystalline structure. The alloys shall be made to meet specified maximum core-loss values and shall be intended primarily for commercial power frequency applications. Desirable core-loss and permeability characteristics shall be developed by further heat treatment in a magnetic field. Amorphous magnetic core alloys are normally composed of iron with small amounts of alloying elements such as boron and silicon. There are no specific chemical requirements in this specification. Material produced to this specification shall conform to the required physical and mechanical properties such as density, ductility, thermal expansion, thermal conductivity, volume resistivity, lamination factor, surface, edge, and pinholes. The alloy shall also conform to the magnetic property requirements such as DC induction, DC coercive field strength, DC residual induction, core loss, and specific exciting power.
SCOPE
1.1 This specification covers the general requirements to which flat-cast, amorphous, semi-processed, iron-base magnetic core alloys must conform.
1.2 These alloys are produced by a rapid-quenching, direct-casting process, resulting in metals with noncrystalline (amorphous) structure. The metallic alloys are made to meet specified maximum core-loss values and are intended primarily for commercial power frequency (50- and 60-Hz) applications in magnetic devices. Desirable core-loss and permeability characteristics are developed by further heat treatment in a magnetic field by the user. The heat treatment typically consists of heating the material to a temperature of 320 to 420°C in a dry, inert atmosphere for 5 to 10 min, although soak times of up to 2 h may be used for large transformer cores. A magnetic field may be required during annealing as designated by the producer. Exact optimum annealing conditions depend on the processing of the material and the size and shape of the device.
1.3 Some of these alloys are sensitive to mechanical stress. Care must be exercised in minimizing any stresses on the material in its final application, otherwise, its magnetic properties will be significantly impaired.
1.4 This specification is developed to aid in the purchase of transformer grade amorphous strip. It provides the chemical, physical, and magnetic parameters and procedures for quality control tests.
1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are numerical conversions to customary (cgs and inch-pound) units which are provided for information only and are not considered standard.
1.6 This standard does not purport to address the safety concerns associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.7 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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Standards Content (Sample)
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.
Designation:A901 −19
Standard Specification for
1
Amorphous Magnetic Core Alloys, Semi-Processed Types
This standard is issued under the fixed designation A901; 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 1.7 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 This specification covers the general requirements to
ization established in the Decision on Principles for the
which flat-cast, amorphous, semi-processed, iron-base mag-
Development of International Standards, Guides and Recom-
netic core alloys must conform.
mendations issued by the World Trade Organization Technical
1.2 These alloys are produced by a rapid-quenching, direct-
Barriers to Trade (TBT) Committee.
casting process, resulting in metals with noncrystalline (amor-
2. Referenced Documents
phous) structure. The metallic alloys are made to meet speci-
2
fied maximum core-loss values and are intended primarily for
2.1 ASTM Standards:
commercial power frequency (50- and 60-Hz) applications in
A34/A34M Practice for Sampling and Procurement Testing
magnetic devices. Desirable core-loss and permeability char-
of Magnetic Materials
acteristics are developed by further heat treatment in a mag-
A340 Terminology of Symbols and Definitions Relating to
netic field by the user. The heat treatment typically consists of
Magnetic Testing
heating the material to a temperature of 320 to 420°C in a dry,
A712 Test Method for Electrical Resistivity of Soft Mag-
inert atmosphere for 5 to 10 min, although soak times of up to
netic Alloys
2 h may be used for large transformer cores. A magnetic field
A773/A773M Test Method for Direct Current Magnetic
may be required during annealing as designated by the pro-
Properties of Low Coercivity Magnetic Materials Using
ducer. Exact optimum annealing conditions depend on the
Hysteresigraphs
processing of the material and the size and shape of the device.
A900/A900M Test Method for Lamination Factor of Amor-
phous Magnetic Strip
1.3 Some of these alloys are sensitive to mechanical stress.
A912/A912M Test Method for Alternating-Current Mag-
Care must be exercised in minimizing any stresses on the
netic Properties of Amorphous Materials at Power Fre-
material in its final application, otherwise, its magnetic prop-
quencies Using Wattmeter-Ammeter-Voltmeter Method
erties will be significantly impaired.
with Toroidal Specimens
1.4 This specification is developed to aid in the purchase of
A932/A932M Test Method for Alternating-Current Mag-
transformer grade amorphous strip. It provides the chemical,
netic Properties of Amorphous Materials at Power Fre-
physical, and magnetic parameters and procedures for quality
quencies Using Wattmeter-Ammeter-Voltmeter Method
control tests.
with Sheet Specimens
1.5 The values stated in SI units are to be regarded as
C693 Test Method for Density of Glass by Buoyancy
standard. The values given in parentheses are numerical
D3455 Test Methods for Compatibility of Construction Ma-
conversionstocustomary(cgsandinch-pound)unitswhichare
terial with Electrical Insulating Oil of Petroleum Origin
provided for information only and are not considered standard.
3. Terminology
1.6 This standard does not purport to address the safety
3.1 The terms and symbols used in this specification are
concerns associated with its use. It is the responsibility of the
defined in Terminology A340.
user of this standard to establish appropriate safety, health,
andenvironmentalpracticesanddeterminetheapplicabilityof
4. Classification
regulatory limitations prior to use.
4.1 The classification of iron-based amorphous alloys con-
forming to this material specification are given in Table 1 and
Table 2.
1
This specification is under the jurisdiction of ASTM Committee A06 on
Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on
2
Material Specifications. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Aug. 1, 2019. Published August 2019. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1990. Last previous edition approved in 2012 as A901 – 12. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/A0901-19. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A901 − 12 A901 − 19
Standard Specification for
1
Amorphous Magnetic Core Alloys, Semi-Processed Types
This standard is issued under the fixed designation A901; 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
1.1 This specification covers the general requirements to which flat-cast, amorphous, semi-processed, iron-base magnetic core
alloys must conform.
1.2 These alloys are produced by a rapid-quenching, direct-casting process, resulting in metals with noncrystalline (amorphous)
structure. The metallic alloys are made to meet specified maximum core-loss values and are intended primarily for commercial
power frequency (50- and 60-Hz) applications in magnetic devices. Desirable core-loss and permeability characteristics are
developed by further heat treatment in a magnetic field by the user. The heat treatment typically consists of heating the material
to a temperature of 320 to 420°C in a dry, inert atmosphere for 5 to 10 min, although soak times of up to 2 h may be used for
large transformer cores. A magnetic field may be required during annealing as designated by the producer. Exact optimum
annealing conditions depend on the processing of the material and the size and shape of the device.
1.3 Some of these alloys are sensitive to mechanical stress. Care must be exercised in minimizing any stresses on the material
in its final application, otherwise, its magnetic properties will be significantly impaired.
1.4 This specification is developed to aid in the purchase of transformer grade amorphous strip. It provides the chemical,
physical, and magnetic parameters and procedures for quality control tests.
1.5 The values stated in customary (cgs-emu and inch-pound) SI units are to be regarded as standard. The values given in
parentheses are mathematicalnumerical conversions to SI customary (cgs and inch-pound) units which are provided for
information only and are not considered standard.
NOTE 1—For more information on procedures associated with this specification, refer to the following: Practices A34/A34M, A664, A700, and B490;
Test Methods A370 and A773/A773M.
1.6 This standard does not purport to address the safety concerns associated with its use. It is the responsibility of the user of
this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the applicability of
regulatory limitations prior to use.
1.7 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.
2. Referenced Documents
2
2.1 ASTM Standards:
A34/A34M Practice for Sampling and Procurement Testing of Magnetic Materials
A340 Terminology of Symbols and Definitions Relating to Magnetic Testing
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A664 Practice for Identification of Standard Electrical Steel Grades in ASTM Specifications
A700 Guide for Packaging, Marking, and Loading Methods for Steel Products for Shipment
A712 Test Method for Electrical Resistivity of Soft Magnetic Alloys
A773/A773M Test Method for Direct Current Magnetic Properties of Low Coercivity Magnetic Materials Using Hysteresig-
raphs
1
This specification is under the jurisdiction of ASTM Committee A06 on Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on Material
Specifications.
Current edition approved Feb. 15, 2012Aug. 1, 2019. Published March 2012August 2019. Originally approved in 1990. Last previous edition approved in 20082012 as
A901–03(2008).A901 – 12. DOI: 10.1520/A0901-12.10.1520/A0901-19.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM 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
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A901 − 19
A900/A900M Test Method for Lamination Factor of Amorphous Magnetic Strip
A912/A912M Test Method for Alternatin
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