ASTM A753-02

Standard Specification for Wrought Nickel-Iron Soft Magnetic Alloys (UNS K94490, K94840, N14076, N14080)

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) 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: 09-Oct-2002
• ICS: 77.120.40 - Nickel, chromium and their alloys
• Technical Committee: A06 - Magnetic Properties
• Drafting Committee: A06.02 - Material Specifications

Relations

• Replaces: ASTM A753-97 - Standard Specification for Wrought Nickel-Iron Soft Magnetic Alloys (UNS K94490, K94840, N14076, N14080)
• Effective Date: 10-Oct-2002
• Replaced By: ASTM A753-08 - 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: 10-Oct-2002

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: A 753 – 02
Standard Specification for
Wrought Nickel-Iron Soft Magnetic Alloys (UNS K94490,
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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 (e) indicates an editorial change since the last revision or reapproval.
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1. Scope ing of Magnetic Materials
A 340 Terminology of Symbols and Definitions Relating to
1.1 This specification covers commonly used wrought
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Magnetic Testing
nickel-ironsoftmagneticalloysproducedorsuppliedexpressly
A 341/A 341M Test Method for Direct Current Magnetic
for use in magnetic cores and other parts requiring high
Properties of Materials Using dc Permeameters and the
magnetic permeability, high electrical resistivity, low coercive
2
Ballistic Test Methods
field strength, and low core loss.
A 343 Test Method forAlternating-Current Magnetic Prop-
1.2 This specification covers materials supplied by a pro-
erties of Materials at Power Frequencies UsingWattmeter-
ducer or converter to the form and physical condition desired
Ammeter-Voltmeter Method and 25-cm Epstein Test
for fabrication into parts that will later be given a final heat
2
Frame
treatment to achieve the desired magnetic characteristics. It
A 480/M 480M SpecificationforGeneralRequirementsfor
covers materials supplied in the form of forging billet; hot-
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
rolled plate, strip, and bar; cold-finished bar; cold-rolled and
3
Sheet, and Strip
annealed sheet and strip; shaped bar and wire; and wire.
A 484/A 484M Specification for General Requirements for
1.2.1 This specification does not cover either powder met-
Stainless and Heat-Resisting Steel Bars and Shapes, Car-
allurgically produced or cast parts.
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bon, Rolled from “T” Rails
1.2.2 This specification lists requirements for strip products
A 555/A 555M Specification for General Requirements for
having isotropic or semi-isotropic magnetic properties but does
3
Stainless Steel Wire and Wire Rods
not include requirements for anisotropic or square hysteresis
A 596/A 596M Test Method for Direct-Current Magnetic
loop alloys or alloys processed to yield flattened hysteresis
Properties of Materials Using the Ballistic Method and
loops by use of heat treatments in an applied magnetic field.
2
Ring Specimens
1.2.3 This specification does not cover alloys modified by
A 772 Test Method for ac Magnetic Permeability of Mate-
theadditionofelementssuchassulfurandseleniumtoenhance
2
rials Using Sinusoidal Current
machinability.
A 773/A 773M Test Method for dc Magnetic Properties of
1.3 The values stated in customary (cgs-emu and inch-
Materials Using Ring and Permeameter Procedures with
pound) units are to be regarded as standard. The values given
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dc Electronic Hysteresigraphs
in parentheses are mathematical conversions to SI units which
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E 527 Practice for Numbering Metals and Alloys (UNS)
are provided for information only and are not considered
E 1019 Test Methods for Determination of Carbon, Sulfur,
standard.
Nitrogen, and Oxygen in Steel and in Iron, Nickel, and
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2. Referenced Documents
Cobalt Alloys
2.1 ASTM Standards:
3. Terminology
A 34/A 34M Practice for Sampling and Procurement Test-
3.1 The terms and symbols used in this specification are
defined in Terminology A 340.
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This specification is under the jurisdiction of ASTM Committee A06 on
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Magnetic Properties , and is the direct responsibility of Subcommittee A06.02 on Annual Book of ASTM Standards, Vol 03.04.
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Material Specifications. Annual Book of ASTM Standards, Vol 01.03.
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Current edition approved Oct. 10, 2002. Published November 2002. Originally Annual Book of ASTM Standards, Vol 01.01.
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published as A 753-78. Last previous edition A 753 - 97. Annual Book of ASTM Standards, Vol 03.05.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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A753–02
TABLE 1 Chemical Requirements (Weight Percent)
4. Classification
Alloy 1 Alloy 2 Alloy 3 Alloy 4
4.1 Four specific alloy types are covered:
UNS K94490 UNS K94840 UNS N14076 UNS N14080
A B
Alloy Type UNS Number Nominal Range of Nickel, %
Carbon, max. 0.05 0.05 0.05 0.05
1 K94490 43.5 to 46.5
Manganese, max. 0.80 0.80 1.5 0.80
2 K94840 47.0 to 49.0
Silicon, max. 0.50 0.50 0.50 0.50
3 N14076 75.0 to 78.0
Phosphorus, max. 0.03 0.03 0.02 0.02
4 N14080 79.0 to 82.0
Sulfur, max. 0.01 0.01 0.01 0.01
Chromium 0.30 max. 0.30 max. 2.0-3.0 0.30 max.
A
UNS refers to the Unified Numbering System, an alloy identification system
Nickel 43.5-46.5 47.0-49.0 75.0-78.0 79.0-82.0
supported by ASTM. Refer to Practice
...