ASTM A848-17
(Specification)Standard Specification for Low-Carbon Magnetic Iron
Standard Specification for Low-Carbon Magnetic Iron
ABSTRACT
This specification covers the standard requirements for wrought low-carbon iron having a carbon content of 0.015% or less with the remainder of the analysis being substantially iron. These alloys are not electrical steels such as are described in Specifications A 726 and A 840 but are instead primarily used in dc magnetic applications and are produced in a wide variety of mill forms such as forging billet and cold finished bar and wire as well as strip. Two alloy types are covered: Type 1 is a low-phosphorus grade and Type 2 contains a phosphorus addition to improve machinability. Apart from chemical requirements, alloy produced to this specification must exhibit guaranteed maximum values of coercive field strength when heat treated according to this specification. This specification has several useful appendices dealing with typical magnetic, physical and mechanical properties, heat treatment and magnetic aging.
SCOPE
1.1 This specification covers the requirements for wrought low-carbon iron typically having a carbon content of 0.015 % or less with the remainder of the chemical composition being substantially iron.
1.1.1 Two alloy types are covered: Type 1 is a low-phosphorous grade and Type 2 contains a phosphorous addition to improve machinability.
1.2 This specification also covers alloys supplied by a producer or converter in the form and condition suitable for fabrication into parts which will be subsequently heat treated to create the desired magnetic characteristics. It covers alloys supplied in the form of forging billets, hot-rolled products, and cold-finished bar, wire, and strip.
1.3 This specification does not cover iron powders capable of being processed into magnetic components. Please refer to the following ASTM Standards for information regarding powdered metal materials and magnetic components: Specifications A811, A839, and A904.
1.4 This specification does not cover flat-rolled, low-carbon electrical steels. Please refer to Specification A726 for information regarding these materials.
1.5 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.
1.6 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 and health practices and determine the applicability of regulatory limitations prior to use.
1.7 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:A848 −17
Standard Specification for
1
Low-Carbon Magnetic Iron
This standard is issued under the fixed designation A848; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This specification covers the requirements for wrought
low-carbon iron typically having a carbon content of 0.015%
2. Referenced Documents
or less with the remainder of the chemical composition being
2
substantially iron.
2.1 ASTM Standards:
1.1.1 Two alloy types are covered: Type 1 is a low-
A34/A34MPractice for Sampling and Procurement Testing
phosphorousgradeandType2containsaphosphorousaddition
of Magnetic Materials
to improve machinability.
A340Terminology of Symbols and Definitions Relating to
1.2 This specification also covers alloys supplied by a Magnetic Testing
producer or converter in the form and condition suitable for
A341/A341MTest Method for Direct Current Magnetic
fabricationintopartswhichwillbesubsequentlyheattreatedto
Properties of Soft Magnetic Materials Using D-C Per-
create the desired magnetic characteristics. It covers alloys
meametersandthePointbyPoint(Ballistic)TestMethods
supplied in the form of forging billets, hot-rolled products, and
A596/A596MTest Method for Direct-Current Magnetic
cold-finished bar, wire, and strip.
Properties of Materials Using the Ballistic Method and
Ring Specimens
1.3 This specification does not cover iron powders capable
A726Specification for Cold-Rolled Magnetic Lamination
of being processed into magnetic components. Please refer to
Quality Steel, Semiprocessed Types
the following ASTM Standards for information regarding
A773/A773MTest Method for Direct Current Magnetic
powdered metal materials and magnetic components: Specifi-
Properties of Low Coercivity Magnetic Materials Using
cations A811, A839, and A904.
Hysteresigraphs
1.4 This specification does not cover flat-rolled, low-carbon
A811Specification for Soft Magnetic Iron Parts Fabricated
electrical steels. Please refer to Specification A726 for infor-
by Powder Metallurgy Techniques
mation regarding these materials.
A839Specification for Iron-Phosphorus Powder Metallurgy
1.5 The values stated in SI units are to be regarded as
Parts for Soft Magnetic Applications
standard. The values given in parentheses are mathematical
A904Specification for 50 Nickel-50 Iron Powder Metal-
conversions to customary (cgs-emu and inch-pound) units
lurgy Soft Magnetic Parts
whichareprovidedforinformationonlyandarenotconsidered
2.2 Other:
standard.
IEC Publication 60404-7 Magnetic Materials – Part 7:
1.6 This standard does not purport to address all of the
Method of Measurement of the Coercivity of Magnetic
safety concerns, if any, associated with its use. It is the
3
Materials in an Open Magnetic Circuit
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
3. Terminology
bility of regulatory limitations prior to use.
1.7 This international standard was developed in accor-
3.1 The terms and symbols used in this specification, unless
dance with internationally recognized principles on standard-
otherwise noted, are defined in Terminology A340.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This specification is under the jurisdiction of ASTM Committee A06 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on Standards volume information, refer to the standard’s Document Summary page on
Material Specifications. the ASTM website.
3
Current edition approved April 1, 2017. Published May 2017. Originally Available from International Electrotechnical Commission (IEC), 3, rue de
approved in 1985. Last previous edition approved in 2011 as A848–01 (2011). Varembé, 1st Floor, P.O. Box 131, CH-1211, Geneva 20, Switzerland, http://
DOI: 10.1520/A0848-17. www.iec.ch.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A848−17
4. Ordering Information 6.1.3.1 Relay condition applies to round bars of 25.4 mm
(1.00 in.) or less in diameter and other special shapes supplied
4.1
...
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: A848 − 01 (Reapproved 2011) A848 − 17
Standard Specification for
1
Low-Carbon Magnetic Iron
This standard is issued under the fixed designation A848; 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 the requirements for wrought low-carbon iron typically having a carbon content of 0.015 % or less
with the remainder of the analysis chemical composition being substantially iron.
1.1.1 Two alloy types are covered: Type 1 is a low-phosphorous grade and Type 2 contains a phosphorous addition to improve
machinability.
1.2 This specification also covers alloys supplied by a producer or converter in the form and condition suitable for fabrication
into parts which will be subsequently heat treated to create the desired magnetic characteristics. It covers alloys supplied in the
form of forging billets, hot-rolled products, and cold-finished bar, wire, and strip.
1.3 This specification does not cover iron powders capable of being processed into magnetic components. Please refer to the
following ASTM Standards for information regarding powdered metal materials and magnetic components: Specifications A811,
A839, and A904.
1.4 This specification does not cover flat-rolled, low-carbon electrical steels. Please refer to Specification A726 for information
regarding these materials.
1.5 The values stated in customary (cgs-emu and inch-pound) SI units are to be regarded as standard. The values given in
parentheses are mathematical conversions to SI customary (cgs-emu and inch-pound) units which are provided for information
only and are not considered standard.
1.6 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 and health practices and determine the applicability of regulatory
limitations prior to use.
1.7 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.
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
A596/A596M Test Method for Direct-Current Magnetic Properties of Materials Using the Ballistic Method and Ring Specimens
A726 Specification for Cold-Rolled Magnetic Lamination Quality Steel, Semiprocessed Types
A773/A773M Test Method for Direct Current Magnetic Properties of Low Coercivity Magnetic Materials Using Hysteresig-
raphs
A811 Specification for Soft Magnetic Iron Parts Fabricated by Powder Metallurgy Techniques
A839 Specification for Iron-Phosphorus Powder Metallurgy Parts for Soft Magnetic Applications
A904 Specification for 50 Nickel-50 Iron Powder Metallurgy Soft Magnetic Parts
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, 2011April 1, 2017. Published May 2011May 2017. Originally approved in 1985. Last previous edition approved in 20062011 as
A848 – 01 (2011). (2006). DOI: 10.1520/A0848-01R11.10.1520/A0848-17.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
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
---------------------- Page: 1 ----------------------
A848 − 17
2.2 Other:
IEC Publication 60404-7 Ed. 1 Magnetic Materials – Part 7: Method of Measurement of the Coercivity of Magnetic Materials
3
in an Open Magnetic Circuit
3. Terminology
3.1 The terms and symbols used in this specification, unless otherwise noted, are defined in Terminology A340.
4. Ordering Informatio
...
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