ASTM A753-97

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 force, 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 final heat treatment to achieve the desired magnetic characteristics. It covers materials supplied in the form of forging billets, hot-rolled plate, strip, and bar; cold-finished bar; cold-rolled and annealed sheet and strip; shaped wire; and wire.  
1.2.1 This specification doesn't 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 either customary (cgs-emu and inch-pound) units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this specification.

General Information

• Status: Historical
• Publication Date: 09-Oct-1997
• ICS: 77.120.40 - Nickel, chromium and their alloys
• Technical Committee: A06 - Magnetic Properties
• Drafting Committee: A06.02 - Material Specifications

Relations

• Replaced By: ASTM A753-02 - Standard Specification for Wrought Nickel-Iron Soft Magnetic Alloys (UNS K94490, K94840, N14076, N14080)
• Effective Date: 10-Oct-2002

Standards Content (Sample)

Designation: A 753 – 97 An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope Properties of Materials Using D-C Permeameters and the
2
Ballistic Test Methods
1.1 This specification covers commonly used wrought
A 343 Test Method for Alternating-Current Magnetic Prop-
nickel-iron soft magnetic alloys produced or supplied expressly
erties of Materials at Power Frequencies Using Wattmeter-
for use in magnetic cores and other parts requiring high
Ammeter-Voltmeter Method and 25-cm Epstein Test
magnetic permeability, high electrical resistivity, low coercive
2
Frame
field strength, and low core loss.
A 480/M 480M Specification for General Requirements for
1.2 This specification covers materials supplied by a pro-
Flat-Rolled Stainless and Heat-Resisting Steel Plate,
ducer or converter to the form and physical condition desired
3
Sheet, and Strip
for fabrication into parts that will later be given a final heat
A 484/A 484M Specification for General Requirements for
treatment to achieve the desired magnetic characteristics. It
Stainless and Heat-Resisting Steel Bars and Shapes, Car-
covers materials supplied in the form of forging billet; hot-
3
bon, Rolled from “T” Rails
rolled plate, strip, and bar; cold-finished bar; cold-rolled and
A 555/A 555M Specification for General Requirements for
annealed sheet and strip; shaped bar and wire; and wire.
3
Stainless Steel Wire and Wire Rods
1.2.1 This specification does not cover either powder met-
A 596/A 596M Test Method for Direct-Current Magnetic
allurgically produced or cast parts.
Properties of Materials Using the Ballistic Method and
1.2.2 This specification lists requirements for strip products
2
Ring Specimens
having isotropic or semi-isotropic magnetic properties but does
A 772 Test Method for A-C Magnetic Permeability of
not include requirements for anisotropic or square hysteresis
2
Materials Using Sine Current
loop alloys or alloys processed to yield flattened hysteresis
A 773/A 773M Test Method for D-C Magnetic Properties
loops by use of heat treatments in an applied magnetic field.
of Materials Using Ring and Permeameter Procedures with
1.2.3 This specification does not cover alloys modified by
2
D-C Electronic Hysteresigraphs
the addition of elements such as sulfur and selenium to enhance
4
E 527 Practice for Numbering Metals and Alloys (UNS)
machinability.
E 1019 Test Methods for Determination of Carbon, Sulfur,
1.3 The values stated in either customary (cgs-emu and
Nitrogen, and Oxygen in Steel and in Iron, Nickel, and
inch-pound) units or SI units are to be regarded separately as
5
Cobalt Alloys
standard. Within the text, the SI units are shown in brackets.
The values stated in each system are not exact equivalents;
3. Terminology
therefore, each system shall be used independently of the other.
3.1 The terms and symbols used in this specification are
Combining values from the two systems may result in noncon-
defined in Terminology A 340.
formance with this specification.
4. Classification
2. Referenced Documents
4.1 Four specific alloy types are covered:
2.1 ASTM Standards:
A B
Alloy Type UNS Number Nominal Range of Nickel, %
A 34/A 34M Practice for Sampling and Procurement Test-
2
ing of Magnetic Materials 1 K94490 43.5 to 46.5
2 K94840 47.0 to 49.0
A 340 Terminology of Symbols and Definitions Relating to
3 N14076 75.0 to 78.0
2
Magnetic Testing
4 N14080 79.0 to 82.0
A 341/A 341M Test Method for Direct Current Magnetic
A
UNS refers to the Unified Numbering System, an alloy identification system
supported by ASTM. Refer to Practice E 527 for details.
B
Alloy Types 3 and 4 have additions of molybdenum, copper, and chromium to
1
This specification is under the jurisdiction of ASTM Committee A-6 on improve magnetic performance.
Magnetic Properties, and is the direct responsibility of Subcommittee A06.02 on
Material Specifications.
3
Current edition approved Oct. 10, 1997. Published December 1998. Originally Annual Book of ASTM Standards, Vol 01.03.
e1 4
published as A 753-78. Last previous edition A 753-85 (1990) . Annual Book of ASTM Standards, Vol 01.01.
2 5
Annual Book of ASTM Standards, Vol 03.04. Annual Book of ASTM Standards, Vol 03.06.
1

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A 753
4.2 Alloy Type 2 in thin-strip form (thickness less than or ture into specific magnetic articles. The desired form and
equal to 0.0200 in. [0.508 mm]) is available in two differe
...