ASTM A753-08

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 inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

General Information

• Status: Historical
• Publication Date: 30-Apr-2008
• ICS: 77.120.40 - Nickel, chromium and their alloys
• Technical Committee: A06 - Magnetic Properties
• Drafting Committee: A06.02 - Material Specifications

Relations

• Replaces: ASTM A753-02 - Standard Specification for Wrought Nickel-Iron Soft Magnetic Alloys (UNS K94490, K94840, N14076, N14080)
• Effective Date: 01-May-2008
• Referred By: ASTM A904-20 - Standard Specification for 50 Nickel-50 Iron Powder Metallurgy Soft Magnetic Parts
• Effective Date: 01-May-2008

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:A753 −08
StandardSpecification 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 A340 Terminology of Symbols and Definitions Relating to
Magnetic Testing
1.1 This specification covers commonly used wrought
A341/A341M Test Method for Direct Current Magnetic
nickel-ironsoftmagneticalloysproducedorsuppliedexpressly
Properties of Materials Using D-C Permeameters and the
for use in magnetic cores and other parts requiring high
Ballistic Test Methods
magnetic permeability, high electrical resistivity, low coercive
A480/A480M Specification for General Requirements for
field strength, and low core loss.
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
1.2 This specification covers materials supplied by a pro-
Sheet, and Strip
ducer or converter to the form and physical condition desired
A484/A484M Specification for General Requirements for
for fabrication into parts that will later be given a final heat
Stainless Steel Bars, Billets, and Forgings
treatment to achieve the desired magnetic characteristics. It
A555/A555M Specification for General Requirements for
covers materials supplied in the form of forging billet; hot-
Stainless Steel Wire and Wire Rods
rolled plate, strip, and bar; cold-finished bar; cold-rolled and
A596/A596M Test Method for Direct-Current Magnetic
annealed sheet and strip; shaped bar and wire; and wire.
Properties of Materials Using the Ballistic Method and
1.2.1 This specification does not cover either powder met-
Ring Specimens
allurgically produced or cast parts.
A772/A772M TestMethodforACMagneticPermeabilityof
1.2.2 This specification lists requirements for strip products
Materials Using Sinusoidal Current
havingisotropicorsemi-isotropicmagneticpropertiesbutdoes
A773/A773M Test Method for dc Magnetic Properties of
not include requirements for anisotropic or square hysteresis
Materials Using Ring and Permeameter Procedures with
loop alloys or alloys processed to yield flattened hysteresis
dc Electronic Hysteresigraphs
loops by use of heat treatments in an applied magnetic field.
E527 Practice for Numbering Metals and Alloys in the
1.2.3 This specification does not cover alloys modified by
Unified Numbering System (UNS)
theadditionofelementssuchassulfurandseleniumtoenhance
E1019 Test Methods for Determination of Carbon, Sulfur,
machinability.
Nitrogen, and Oxygen in Steel, Iron, Nickel, and Cobalt
1.3 The values stated in inch-pound units are to be regarded
Alloys by Various Combustion and Fusion Techniques
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
3. Terminology
and are not considered standard.
3.1 The terms and symbols used in this specification are
defined in Terminology A340.
2. Referenced Documents
2
2.1 ASTM Standards:
4. Classification
A34/A34M Practice for Sampling and Procurement Testing
of Magnetic Materials
4.1 Four specific alloy types are covered in Table 1.
4.2 Alloy Type 2 in thin-strip form (thickness less than or
1
This specification is under the jurisdiction of ASTM Committee A06 on
equal to 0.020 in. (0.51 mm)) is available in two different
Magnetic Properties, and is the direct responsibility of Subcommittee A06.02 on
grades. Grade 1 is semi-isotropic and is recommended for use
Material Specifications.
in transformer laminations. Grade 2 is isotropic and is recom-
Current edition approved May 1, 2008. Published May 2008. Originally
mended for use in rotating machinery laminations and mag-
approved in 1978. Last previous edition approved in 2002 as A753–02. DOI:
10.1520/A0753-08.
netic shielding parts. These grades are the result of different
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
mill processing (that is, cold-rolling and annealing) practices
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
and cannot be created by changes in the final heat treatment
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. given to the laminations or parts.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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A753−08
TABLE 1 Specific Alloy Types
6.2 Determination of metallic constituents and phosphorus
A B
Alloy Type UNS Number Nickel Range, % shall be by a method(s) acceptable to both producer and user.
1 K94490 43.5 to 46.5 Analysis of ca
...

This document is not anASTM standard and is intended only to provide the user of anASTM 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:A753–02 Designation: A 753 – 08
Standard Specification for
Wrought Nickel-Iron Soft Magnetic Alloys (UNS K94490,
1
K94840, N14076, N14080)
This standard is issued under the fixed designation A 753; 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 customary (cgs-emu and inch-pound) inch-pound units are to be regarded as standard.The values given
in parentheses are mathematical conversions to SI units whichthat are provided for information only and are not considered
standard.
2. Referenced Documents
2
2.1 ASTM Standards:
A 34/A 34M Practice for Sampling and Procurement Testing of Magnetic Materials
A 340 Terminology of Symbols and Definitions Relating to Magnetic Testing
A 341/A 341M Test Method for Direct Current Magnetic Properties of Materials Using dc Permeameters and the Ballistic Test
2
Methods
A343Test Method for Alternating-Current Magnetic Properties of Materials at Power Frequencies Using Wattmeter-Ammeter-
2
Voltmeter Method and 25-cm Epstein Test Frame Test Method for Direct Current Magnetic Properties of Materials Using
D-C Permeameters and the Ballistic Test Methods
A 480/MA 480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and
Strip
A 484/A 484M Specification for General Requirements for Stainless and Heat-Resisting Steel Bars and Shapes, Carbon, Rolled
3
from “T” Rails Specification for General Requirements for Stainless Steel Bars, Billets, and Forgings
A 555/A 555M Specification for General Requirements for Stainless Steel Wire and Wire Rods
A 596/A 596M Test Method for Direct-Current Magnetic Properties of Materials Using the Ballistic Method and Ring
Specimens
A 772/A 772M Test Method for acAC Magnetic Permeability of Materials Using Sinusoidal Current
A 773/A 773M Test Method for dc Magnetic Properties of Materials Using Ring and Permeameter Procedures with dc
Electronic Hysteresigraphs
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 Oct. 10, 2002. Published November 2002. Originally published as A753-78. Last previous edition A753-97.
Current edition approved May 1, 2008. Published May 2008. Originally approved in 1978. Last previous edition approved in 2002 as A 753–02.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at [e-mail]. ForAnnualBookofASTMStandards
, Vol 03.04.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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A753–08
E 527Practice for Numbering Metals andAlloys (UNS) Practice for Numbering Metals andAlloys in the Unified Numbering
System (UNS)
E 1019 TestMethodsforDeterminationofCarbon,Sulfur,Nitrogen,andOxygeninSteelandinIron,Nickel,andCobaltAlloys
3. Terminology
3.1
...