ASTM A34/A34M-06(2021)

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: A34/A34M − 06 (Reapproved 2021)
Standard Practice for
Sampling and Procurement Testing of Magnetic Materials
This standard is issued under the fixed designation A34/A34M; 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 2. Referenced Documents
2.1 ASTM Standards:
1.1 This practice covers sampling procedures and test prac-
A340 Terminology of Symbols and Definitions Relating to
tices for determination of various magnetic properties of both
Magnetic Testing
soft and hard magnetic materials.
1.2 This practice may be used either in conjunction with, or
3. Terminology
independent of, the standard test methods and materials speci-
3.1 Definitions:
fications under the jurisdiction of ASTM Committee A06. In
3.1.1 For definitions of terms relating to magnetic testing,
the former situation, the sampling and testing procedures listed
reference shall be made to Terminology A340.
herein shall not supersede those found in the individual test
methods and materials specifications. In the latter situation, the
4. Significance and Use
sampling and testing procedures listed herein shall strictly
apply.
4.1 This practice defines test lots and describes the selection
and preparation of test specimens used in the determination of
1.3 The values and equations stated in customary (cgs-emu
magnetic properties of various materials.
and inch-pound) or SI units are to be regarded separately as
standard. Within this standard, SI units are shown in brackets
4.2 A method of calculating the density of iron-base elec-
except for the sections concerning calculations where there are
trical steels is given and a table of assumed densities for
separate sections for the respective unit systems. The values
magnetic testing of commercial soft magnetic alloys is pro-
stated in each system may not be exact equivalents; therefore,
vided.
each system shall be used independently of the other. Combin-
ing values from the two systems may result in nonconformance
5. Test Lots
with this standard.
5.1 Wrought, Flat-Rolled, or Long Products:
1.4 This standard does not purport to address all of the
5.1.1 Atest lot of wrought, flat-rolled, or long products shall
safety concerns, if any, associated with its use. It is the consist of not more than 50 000 lb [23 000 kg] of material.
responsibility of the user of this standard to establish appro-
5.1.2 A test lot may be composed of coils or cut lengths. A
priate safety, health, and environmental practices and deter- test lot of coil product may consist of one or more coils having
mine the applicability of regulatory limitations prior to use.
essentially the same treatment and composition.
1.5 This international standard was developed in accor-
5.2 Amorphous Strip and Wire:
dance with internationally recognized principles on standard-
5.2.1 A test lot shall consist of a continuously cast strip or
ization established in the Decision on Principles for the
wire in one coil without breaks. In practice this may represent
Development of International Standards, Guides and Recom-
quantities up to 2200 lb [1000 kg].
mendations issued by the World Trade Organization Technical
5.3 Powder Metallurgically Produced Parts:
Barriers to Trade (TBT) Committee.
5.3.1 A test lot shall consist of parts of the same geometry
and dimensions, made from powder of the same composition,
This practice is under the jurisdiction of ASTM Committee A06 on Magnetic
Properties and is the direct responsibility of Subcommittee A06.01 on Test
Methods. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Feb. 1, 2021. Published February 2021. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1911. Last previous edition approved in 2018 as A34/A34M – 06 Standards volume information, refer to the standard’s Document Summary page on
(2018). DOI: 10.1520/A0034_A0034M-06R21. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A34/A34M − 06 (2021)
molded and sintered under the same conditions, which have 6.5.1 Sampling shall consist of one sample per test lot
been submitted for inspection at one time. unless otherwise specified in the appropriate ASTM specifica-
tion or by mutual agreement between the producer and
5.4 Cast Parts:
purchaser.
5.4.1 A test lot shall consist of parts of the same geometry
and dimensions, made from the same casting heat, which have 6.6 Cast Parts:
6.6.1 Sampling shall consist of one sample per test lot
been submitted for inspection at one time.
unless otherwise specified in the appropriate ASTM specifica-
tion or by mutual agreement between the producer and
6. Sampling
purchaser.
6.1 Electrical Steel Coils:
6.1.1 From test lots in coil form, consisting of only one
7. Test Specimens
master coil, prepare the test strips from test sheets cut from one
7.1 The test specimens used for the determination of prop-
or both ends of the coil.
erties of magnetic materials will vary in form, depending upon
6.1.2 When a test lot in coil form consists of several coils
the test equipment and the dimensions of the material to be
sheared or slit from a master coil, the test strips shall be
tested. Prepare the test specimens in a manner to adequately
prepared from test sheets representing one or both ends of the
represent the areas being sampled. Standard forms include flat
master coil.
strips, rings, bars, and links in accordance with the following
6.1.3 When a test lot in coil form consists of several coils
practices.
having essentially the same treatment and composition, test
7.1.1 Flat Strips:
strips shall be prepared from test sheets cut from one or both
7.1.1.1 Except when otherwise established by mutual agree-
ends of enough master coils to be representative of the lot.
ment between the producer and the purchaser, the Epstein test
6.2 Electrical Steel Cut Lengths: specimen shall be the standard specimen for determination of
6.2.1 When cut lengths are sheared from coil material
the magnetic properties of flat-rolled electrical steels.
without subsequent treatments (such as roller leveling or cold 7.1.1.2 Standard Epstein test specimens shall be composed
rolling), the test on the original coil shall suffice.
of test strips preferably cut from test sheets in a manner shown
6.2.2 Two or more test sheets shall be taken from the same in Fig. 1 (a) or (b). One half of the strips are cut parallel to and
lotofcutlengthsteelthathasbeencoldrolledorleveled.These
the other half cut perpendicular to the direction of rolling.
test sheets shall not lie adjacent to each other, but shall be 7.1.1.3 If the width of the material does not permit cutting
selected in a manner to assure representative sampling.
of strips perpendicular to the rolling direction, or, if the
material has preferred properties in any one direction with
6.3 Wrought Products Other Than Electrical Steels:
respect to the direction of rolling, or, if the material is to be
6.3.1 Sampling shall be one sample per each heat applied to
used with the flux in any one direction, all of the strips may be
the order unless otherwise specified in the appropriate ASTM
cut in a specified direction which shall be agreed upon by the
specification or by mutual agreement between the producer and
producer and the purchaser. All lengthwise strips may be
purchaser.
selected as shown in Fig. 1 (c).
6.4 Amorphous Strip and Wire:
7.1.1.4 When fewer than the tota
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