ASTM A753-21
(Specification)Standard Specification for Wrought Nickel-Iron Soft Magnetic Alloys (UNS K94490, K94840, N14076, N14080)
Standard Specification for Wrought Nickel-Iron Soft Magnetic Alloys (UNS K94490, K94840, N14076, N14080)
ABSTRACT
This specification covers commonly used wrought nickel-iron soft magnetic alloys produced or supplied expressly for use in magnetic cores and other parts requiring high magnetic permeability, high electrical resistivity, low coercive field strength, and low core loss. This specification does not cover material produced by casting or by powder metallurgy techniques. These materials are capable of being produced in a wide variety of forms and conditions such as forging billet, hot-rolled plate, strip, and bar, cold-finished bars, cold-rolled sheep and strip, shaped bar and wire. Four specific alloy types containing nominally 45, 48, 76 and 80 nickel with various other elements are covered by this specification. The alloy chemistry requirements are listed. Magnetic property requirements for the different alloys, product forms and sizes are specified. Typical physical property data and useful heat treatment information are provided in appendices.
SCOPE
1.1 This specification covers commonly used wrought nickel-iron soft magnetic alloys produced or supplied expressly for use in magnetic cores and other parts requiring high magnetic permeability, high electrical resistivity, low coercive field strength, and low core loss.
1.2 This specification covers materials supplied by a producer or converter to the form and physical condition desired for fabrication into parts that will later be given a final heat treatment to achieve the desired magnetic characteristics. It covers materials supplied in the form of forging billet; hot-rolled plate, strip, and bar; cold-finished bar; cold-rolled and annealed sheet and strip; shaped bar and wire; and wire.
1.2.1 This specification does not cover either powder metallurgically produced or cast parts.
1.2.2 This specification lists requirements for strip products having isotropic or semi-isotropic magnetic properties but does not include requirements for anisotropic or square hysteresis loop alloys or alloys processed to yield flattened hysteresis loops by use of heat treatments in an applied magnetic field.
1.2.3 This specification does not cover alloys modified by the addition of elements such as sulfur and selenium to enhance machinability.
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to customary (cgs-emu and inch-pound) units which are provided for information only and are not considered standard.
1.3.1 There are selected values presented in two units, both of which are in acceptable SI units. These are differentiated by the word “, or,” as in “g/cm3, or, (kg/m3).” In addition, values for mean linear coefficient of expansion in Table X1.1 are shown solely in μm/m/°C in keeping with prior versions of this standard.
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 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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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:A753 −21
Standard Specification for
Wrought Nickel-Iron Soft Magnetic Alloys (UNS K94490,
1
K94840, N14076, N14080)
This standard is issued under the fixed designation A753; 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 1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This specification covers commonly used wrought
responsibility of the user of this standard to establish appro-
nickel-ironsoftmagneticalloysproducedorsuppliedexpressly
priate safety, health, and environmental practices and deter-
for use in magnetic cores and other parts requiring high
mine the applicability of regulatory limitations prior to use.
magnetic permeability, high electrical resistivity, low coercive
1.5 This international standard was developed in accor-
field strength, and low core loss.
dance with internationally recognized principles on standard-
1.2 This specification covers materials supplied by a pro-
ization established in the Decision on Principles for the
ducer or converter to the form and physical condition desired
Development of International Standards, Guides and Recom-
for fabrication into parts that will later be given a final heat
mendations issued by the World Trade Organization Technical
treatment to achieve the desired magnetic characteristics. It
Barriers to Trade (TBT) Committee.
covers materials supplied in the form of forging billet; hot-
2. Referenced Documents
rolled plate, strip, and bar; cold-finished bar; cold-rolled and
2
annealed sheet and strip; shaped bar and wire; and wire.
2.1 ASTM Standards:
1.2.1 This specification does not cover either powder met-
A34/A34M Practice for Sampling and Procurement Testing
allurgically produced or cast parts.
of Magnetic Materials
1.2.2 This specification lists requirements for strip products
A340 Terminology of Symbols and Definitions Relating to
havingisotropicorsemi-isotropicmagneticpropertiesbutdoes
Magnetic Testing
not include requirements for anisotropic or square hysteresis
A341/A341M Test Method for Direct Current Magnetic
loop alloys or alloys processed to yield flattened hysteresis
Properties of Soft Magnetic Materials Using D-C Per-
loops by use of heat treatments in an applied magnetic field.
meameters and the Point by Point (Ballistic)Test Methods
1.2.3 This specification does not cover alloys modified by A480/A480M Specification for General Requirements for
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
theadditionofelementssuchassulfurandseleniumtoenhance
machinability. Sheet, and Strip
A484/A484M Specification for General Requirements for
1.3 The values stated in SI units are to be regarded as
Stainless Steel Bars, Billets, and Forgings
standard. The values given in parentheses are mathematical
A555/A555M Specification for General Requirements for
conversions to customary (cgs-emu and inch-pound) units
Stainless Steel Wire and Wire Rods
whichareprovidedforinformationonlyandarenotconsidered
A596/A596M Test Method for Direct-Current Magnetic
standard.
PropertiesofMaterialsUsingthePointbyPoint(Ballistic)
1.3.1 There are selected values presented in two units, both
Method and Ring Specimens
of which are in acceptable SI units. These are differentiated by
A772/A772M TestMethodforACMagneticPermeabilityof
3 3
the word “, or,” as in “g/cm , or, (kg/m ).” In addition, values
Materials Using Sinusoidal Current
for mean linear coefficient of expansion in Table X1.1 are
A773/A773M Test Method for Direct Current Magnetic
shown solely in µm/m/°C in keeping with prior versions of this
Properties of Low Coercivity Magnetic Materials Using
standard.
Hysteresigraphs
E527 Practice for Numbering Metals and Alloys in the
Unified Numbering System (UNS)
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 Feb. 1, 2021. Published February 2021. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1978. Last previous edition approved in 2013 as A753 – 08 (2013). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/A0753-21. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA
...
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: A753 − 08 (Reapproved 2013) A753 − 21
Standard Specification for
Wrought Nickel-Iron Soft Magnetic Alloys (UNS K94490,
1
K94840, N14076, N14080)
This standard is issued under the fixed designation A753; 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 commonly used wrought nickel-iron soft magnetic alloys produced or supplied expressly for use in
magnetic cores and other parts requiring high magnetic permeability, high electrical resistivity, low coercive field strength, and low
core loss.
1.2 This specification covers materials supplied by a producer or converter to the form and physical condition desired for
fabrication into parts that will later be given a final heat treatment to achieve the desired magnetic characteristics. It covers
materials supplied in the form of forging billet; hot-rolled plate, strip, and bar; cold-finished bar; cold-rolled and annealed sheet
and strip; shaped bar and wire; and wire.
1.2.1 This specification does not cover either powder metallurgically produced or cast parts.
1.2.2 This specification lists requirements for strip products having isotropic or semi-isotropic magnetic properties but does not
include requirements for anisotropic or square hysteresis loop alloys or alloys processed to yield flattened hysteresis loops by use
of heat treatments in an applied magnetic field.
1.2.3 This specification does not cover alloys modified by the addition of elements such as sulfur and selenium to enhance
machinability.
1.3 The values stated in inch-poundSI units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units thatcustomary (cgs-emu and inch-pound) units which are provided for information only and are not
considered standard.
1.3.1 There are selected values presented in two units, both of which are in acceptable SI units. These are differentiated by the
3 3
word “, or,” as in “g/cm , or, (kg/m ).” In addition, values for mean linear coefficient of expansion in Table X1.1 are shown solely
in μm/m/°C in keeping with prior versions of this standard.
1.4 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.5 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.
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 May 1, 2013Feb. 1, 2021. Published July 2013February 2021. Originally approved in 1978. Last previous edition approved in 20082013 as
A753A753 – 08 (2013).–08. DOI: 10.1520/A0753-08R13.10.1520/A0753-21.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A753 − 21
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
A341/A341M Test Method for Direct Current Magnetic Properties of Soft Magnetic Materials Using D-C Permeameters and the
Point by Point (Ballistic) Test Methods
A480/A480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip
A484/A484M Specification for General Requirements for Stainless Steel Bars, Billets, and Forgings
A555/A555M Specification for General Requirements for Stainless Steel Wire and Wire Rods
A596/A596M Test Method for Direct-Current Magnetic Properties of Materials Using the Point by Point (Ballistic) Method and
Ring Specimens
A772/A772M Test Method for AC Magnetic Permeability of Materials Using Sinusoidal Current
A773/A773M Test Method for Direct Current Magnetic Properties of Low Coercivity Magnetic Materia
...
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