ASTM A1126-23

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: A1126 − 23
Standard Specification for
Magnetic Pure Iron
This standard is issued under the fixed designation A1126; 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 1.8 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 the requirements for mill-cast
responsibility of the user of this standard to establish appro-
and wrought magnetic pure iron containing no more than
priate safety, health, and environmental practices and deter-
0.0060 % carbon and a typical total iron content of 99.9 %. The
mine the applicability of regulatory limitations prior to use.
magnetic characteristics exhibited by magnetic pure iron are
1.9 This international standard was developed in accor-
made possible by the absence of alloying elements during
dance with internationally recognized principles on standard-
production.
ization established in the Decision on Principles for the
1.2 This specification also covers magnetic pure iron sup-
Development of International Standards, Guides and Recom-
plied in a form and condition which allows for subsequent heat
mendations issued by the World Trade Organization Technical
treatment to achieve desired magnetic characteristics.
Barriers to Trade (TBT) Committee.
1.3 Magnetic pure iron may be supplied in forms including
2. Referenced Documents
hot-rolled strip, sheet, plate, bar, billet, and slab; cold-rolled
strip and sheet; mill-cast slab and bloom; forgings; and drawn
2.1 ASTM Standards:
wire and rod.
A34/A34M Practice for Sampling and Procurement Testing
of Magnetic Materials
1.4 This specification does not cover cast parts or iron
A340 Terminology of Symbols and Definitions Relating to
powders capable of being processed into magnetic compo-
Magnetic Testing
nents. Please refer to the following ASTM standards for
A341/A341M Test Method for Direct Current Magnetic
information regarding powdered metal materials and magnetic
Properties of Soft Magnetic Materials Using D-C Per-
components: Specifications A811, A839, and A904.
meameters and the Point by Point (Ballistic) Test Methods
1.5 This specification does not cover material that contains
A596/A596M Test Method for Direct-Current Magnetic
constituent elements sufficient to increase the carbon content
Properties of Materials Using the Point by Point (Ballistic)
above 0.0060 % or to decrease the iron content below 99.9 %.
Method and Ring Specimens
Refer to Specification A848 for properties of low carbon
A773/A773M Test Method for Direct Current Magnetic
magnetic iron.
Properties of Low Coercivity Magnetic Materials Using
1.6 The values stated in SI units are to be regarded as Hysteresigraphs
standard. The values given in parentheses are mathematical A811 Specification for Soft Magnetic Iron Parts Fabricated
conversions to customary (cgs-emu and inch-pound) units by Powder Metallurgy Techniques
which are provided for information only and are not considered A839 Specification for Iron-Phosphorus Powder Metallurgy
standard. Parts for Soft Magnetic Applications
1.6.1 There are selected values presented in two units, both A848 Specification for Low-Carbon Magnetic Iron
A904 Specification for 50 Nickel-50 Iron Powder Metal-
of which are acceptable SI units. These are differentiated by the
3 3
word “or,” as in “g/cm , or, (kg/m ).” lurgy Soft Magnetic Parts
1.7 Acceptance values may be generated by an independent
3. Terminology
party. This specification accepts reports from producers or
3.1 The terms and symbols used in this specification, unless
intermediate suppliers.
otherwise noted, are defined in Terminology A340.
This specification is under the jurisdiction of ASTM Committee A06 on
Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Material Specifications. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved May 1, 2023. Published May 2023. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
A1126-23. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A1126 − 23
4. Ordering Information 6.1.4 Forgings.
4.1 Orders to this specification shall include as much of the
7. Magnetic Property Requirements
following information as is required to describe the desired
material: 7.1 Density—The density for test purposes is 7.86 g/cm , or,
4.1.1 ASTM specification number; (7860 kg/m ).
4.1.2 Dimensions and Tolerances—Dimensional tolerances
7.2 Test Specimen—The test specimen size and shape shall
are to be mutually agreed upon between the user and the
conform to Practice A34/A34M. Shapes such as ring
producer or supplier;
laminations, solid rings, Epstein specimens, or straight lengths
4.1.3 Quantity (weight or number of pieces);
having a uniform cross section are preferred. If, however, it is
4.1.4 Form and condition;
impossible to prepare a preferred test specimen shape from the
4.1.5 Magnetic property requirements if they are other than
as-manufactured product, specimen shape and size shall be
stated herein;
mutually agreed upon by the user and producer or supplier.
4.1.6 Certification of chemical analysis or magnetic prop-
7.3 Heat Treatment—When testing of heat-treated speci-
erty evaluation, or both;
mens is requested by the user, the following method shall be
4.1.7 Marking and packaging;
used: in a reducing atmosphere, inert atmosphere, or vacuum,
4.1.8 End Use—Whenever possible, the user should specify
temperature shall be held at 845 °C (1553 °F) for up to two
subsequent processing such as machining, blanking, forging, or
hours and cooled at a rate from 55 °C to 100 °C per hour
deep drawing to shape. This information will help the supplier
(131 °F to 212 °F per hour) to 500 °C (932 °F), and cooled at
provide the most suitable product for the user’s fabrication
any rate thereafter. Use of a heat treatment method other than
practice; and
the method described above shall be subject to agreement
4.1.9 Exceptions to this specification or special require-
between the supplier or producer and user. While the magnetic
ments.
properties of magnetic pure iron are often sufficient as
5. Chemical Composition produced, certain desired magnetic properties require heat
treatment to achieve. See Appendix X2 for a discussion of heat
5.1 Magnetic pure iron supplied to this specification shall
treatment.
conform to the chemical composition requirements shown in
Table 1. 7.4 Test Method—Magnetic testing shall be conducted in
5.1.1 By agreement between user and producer or supplier, accordance with Test Methods A341/A341M, A596/A596M,
analysis may be required, and limits established for elements or A773/A773M. Under this specification, magnetic polariza-
not specified in the table of chemical composition. tion and relative maximum permeability shall be measured
when reporting of magnetic characteristics is required by the
6. Form and Condition
user.
6.1 Magnetic pure iron is capable o
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