ASTM A596/A596M-95(2004)
(Test Method)Standard Test Method for Direct-Current Magnetic Properties of Materials Using the Ballistic Method and Ring Specimens
Standard Test Method for Direct-Current Magnetic Properties of Materials Using the Ballistic Method and Ring Specimens
SIGNIFICANCE AND USE
Test methods using suitable ring-type specimens4 are the preferred methods of determining the basic magnetic properties of a material caused by the absence of demagnetizing effects and are well suited for specification acceptance, service evaluation, and research and development.
Provided the test specimen is representative of the bulk material as is usually the case for thin strip and wire, this test is also suitable for design purposes.
When the test specimen is not necessarily representative of the bulk material such as a ring machined from a large forging or casting, the results of this test method may not be an accurate indicator of the magnetic properties of the bulk material. In such instances, the test results when viewed in context of past performance history will be useful for judging the suitability of the current material for the intended application.
SCOPE
1.1 This test method covers dc ballistic testing for the determination of basic magnetic properties of materials in the form of ring, toroidal, link, double-lapped Epstein cores, or other standard shapes which may be cut, stamped, machined, or ground from cast, compacted, sintered, forged, or rolled materials. It includes tests for normal induction and hysteresis taken under conditions of steep wavefront reversals of the direct-current magnetic field strength.
1.2 This test method shall be used in conjunction with Practice A 34/A 34M.
1.3 This test method is suitable for a testing range from very low magnetic field strength up to 200 or more Oe [15.9 or more kA/m]. The lower limit is determined by integrator sensitivity and the upper limit by heat generation in the magnetizing winding. Special techniques and short duration testing may extend the upper limit of magnetic field strength.
1.4 Testing under this test method is inherently more accurate than other methods. When specified dimensional or shape requirements are observed, the measurements are a good approximation to absolute properties. Test accuracy available is primarily limited by the accuracy of instrumentation.
1.5 This test method permits a choice of test specimen to permit measurement of properties in any desired direction relative to the direction of crystallographic orientation without interference from external yoke systems.
1.6 The symbols and abbreviated definitions used in this test method appear in and Sections 5, 6, 9, and 10. For the official definitions see Terminology A 340. Note that the term flux density used in this document is synonymous with the term magnetic induction.
1.7 The values stated in either customary (cgs-emu and inch-pound) units or SI units are to be regarded separately as standard. Within this test method, the SI units are shown in brackets except for the sections concerning calculations where there are separate sections for the respective unit systems. 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 method.
1.8 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.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
Designation: A 596/A 596M – 95 (Reapproved 2004)
Standard Test Method for
Direct-Current Magnetic Properties of Materials Using the
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Ballistic Method and Ring Specimens
ThisstandardisissuedunderthefixeddesignationA596/A596M;thenumberimmediatelyfollowingthedesignationindicatestheyear
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 (ϵ) indicates an editorial change since the last revision or reapproval.
1. Scope 1.7 The values stated in either customary (cgs-emu and
inch-pound) units or SI units are to be regarded separately as
1.1 This test method covers dc ballistic testing for the
standard. Within this test method, the SI units are shown in
determination of basic magnetic properties of materials in the
brackets except for the sections concerning calculations where
form of ring, toroidal, link, double-lapped Epstein cores, or
there are separate sections for the respective unit systems. The
other standard shapes which may be cut, stamped, machined,
values stated in each system are not exact equivalents; there-
or ground from cast, compacted, sintered, forged, or rolled
fore, each system shall be used independently of the other.
materials. It includes tests for normal induction and hysteresis
Combiningvaluesfromthetwosystemsmayresultinnoncon-
taken under conditions of steep wavefront reversals of the
formance with this method.
direct-current magnetic field strength.
1.8 This standard does not purport to address all of the
1.2 This test method shall be used in conjunction with
safety concerns, if any, associated with its use. It is the
Practice A34/A34MA34/A34M.
responsibility of the user of this standard to establish appro-
1.3 Thistestmethodissuitableforatestingrangefromvery
priate safety and health practices and determine the applica-
lowmagneticfieldstrengthupto200ormoreOe[15.9ormore
bility of regulatory limitations prior to use.
kA/m]. The lower limit is determined by integrator sensitivity
and the upper limit by heat generation in the magnetizing
2. Referenced Documents
winding. Special techniques and short duration testing may
2.1 ASTM Standards:
extend the upper limit of magnetic field strength.
A34/A34M Practice for Sampling and Procurement Test-
1.4 Testing under this test method is inherently more accu-
2
ing of Magnetic Materials
rate than other methods. When specified dimensional or shape
A340 Terminology of Symbols and Definitions Relating to
requirements are observed, the measurements are a good
2
Magnetic Testing
approximationtoabsoluteproperties.Testaccuracyavailableis
A341/A341M Test Method for Direct Current Magnetic
primarily limited by the accuracy of instrumentation.
Properties of Materials Using dc Permeameters and the
1.5 This test method permits a choice of test specimen to
2
Ballistic Test Methods
permit measurement of properties in any desired direction
A343/A343M Test Method for Alternating-Current Mag-
relative to the direction of crystallographic orientation without
netic Properties of Materials at Power Frequencies Using
interference from external yoke systems.
theWattmeter-Ammeter-VoltmeterMethodand25-cmEp-
1.6 Thesymbolsandabbreviateddefinitionsusedinthistest
2
stein Test Frame
method appear in Fig. 1 and Sections 5, 6, 9, and 10. For the
A773/A773M Test Method for dc Magnetic Properties of
official definitions see TerminologyA340A340. Note that the
Materials Using Ring and Permeameter Procedures with
termfluxdensityusedinthisdocumentissynonymouswiththe
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dc Electronic Hysteresigraphs
term magnetic induction.
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This test method is under the jurisdiction of ASTM Committee A06 on
MagneticPropertiesandisthedirectresponsibilityofSubcommitteeA06.01onTest
2
Methods. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2004. Published October 2004. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1969. Last previous edition approved in 1999 as A596/A596–95 Standards volume information, refer to the standard’s Document Summary page on
(1999). the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM International (www.astm.org) for the latest information.
A 596/A 596M – 95 (2004)
maintained in the test specimens, the magnetic field strength
will be excessively nonuniform throughout the test specimen
andthemeasuredparameterscannotberepresentedasmaterial
properties.
4.2 The basic quality of materials having directionally
sensitivepropertiescannotbetestedsatisfactorilywithrin
...
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