ASTM A34/A34M-06(2012)
(Practice)Standard Practice for Sampling and Procurement Testing of Magnetic Materials
Standard Practice for Sampling and Procurement Testing of Magnetic Materials
SIGNIFICANCE AND USE
4.1 This practice defines test lots and describes the selection and preparation of test specimens used in the determination of magnetic properties of various materials.
4.2 A method of calculating the density of iron-base electrical steels is given and a table of assumed densities for magnetic testing of commercial soft magnetic alloys is provided.
SCOPE
1.1 This practice covers sampling procedures and test practices for determination of various magnetic properties of both soft and hard magnetic materials.
1.2 This practice may be used either in conjunction with, or independent of, the standard test methods and materials specifications under the jurisdiction of ASTM Committee A06. In the former situation, the sampling and testing procedures listed herein shall not supersede those found in the individual test methods and materials specifications. In the latter situation, the sampling and testing procedures listed herein shall strictly apply.
1.3 The values and equations stated in customary (cgs-emu and inch-pound) or SI units are to be regarded separately as standard. Within this standard, 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 may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this standard.
1.4 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.
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Standards Content (Sample)
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Designation: A34/A34M − 06 (Reapproved 2012)
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 3.1.1 For definitions of terms relating to magnetic testing,
reference shall be made to Terminology A340.
1.1 This practice covers sampling procedures and test prac-
tices for determination of various magnetic properties of both
4. Significance and Use
soft and hard magnetic materials.
4.1 This practice defines test lots and describes the selection
1.2 This practice may be used either in conjunction with, or
and preparation of test specimens used in the determination of
independent of, the standard test methods and materials speci-
magnetic properties of various materials.
fications under the jurisdiction of ASTM Committee A06. In
the former situation, the sampling and testing procedures listed 4.2 A method of calculating the density of iron-base elec-
trical steels is given and a table of assumed densities for
herein shall not supersede those found in the individual test
methods and materials specifications. In the latter situation, the magnetic testing of commercial soft magnetic alloys is pro-
vided.
sampling and testing procedures listed herein shall strictly
apply.
5. Test Lots
1.3 The values and equations stated in customary (cgs-emu
5.1 Wrought, Flat-Rolled, or Long Products:
and inch-pound) or SI units are to be regarded separately as
5.1.1 Atest lot of wrought, flat-rolled, or long products shall
standard. Within this standard, SI units are shown in brackets
consist of not more than 50 000 lb [23 000 kg] of material.
except for the sections concerning calculations where there are
5.1.2 A test lot may be composed of coils or cut lengths. A
separate sections for the respective unit systems. The values
test lot of coil product may consist of one or more coils having
stated in each system may not be exact equivalents; therefore,
essentially the same treatment and composition.
each system shall be used independently of the other. Combin-
ing values from the two systems may result in nonconformance
5.2 Amorphous Strip and Wire:
with this standard.
5.2.1 A test lot shall consist of a continuously cast strip or
1.4 This standard does not purport to address all of the wire in one coil without breaks. In practice this may represent
safety concerns, if any, associated with its use. It is the
quantities up to 2200 lb [1000 kg].
responsibility of the user of this standard to establish appro-
5.3 Powder Metallurgically Produced Parts:
priate safety and health practices and determine the applica-
5.3.1 A test lot shall consist of parts of the same geometry
bility of regulatory limitations prior to use.
and dimensions, made from powder of the same composition,
molded and sintered under the same conditions, which have
2. Referenced Documents
been submitted for inspection at one time.
2.1 ASTM Standards:
5.4 Cast Parts:
A340 Terminology of Symbols and Definitions Relating to
5.4.1 A test lot shall consist of parts of the same geometry
Magnetic Testing
and dimensions, made from the same casting heat, which have
3. Terminology
been submitted for inspection at one time.
3.1 Definitions:
6. Sampling
This practice is under the jurisdiction of ASTM Committee A06 on Magnetic
6.1 Electrical Steel Coils:
Properties and is the direct responsibility of Subcommittee A06.01 on Test
6.1.1 From test lots in coil form, consisting of only one
Methods.
master coil, prepare the test strips from test sheets cut from one
Current edition approved Nov. 1, 2012. Published November 2012. Originally
or both ends of the coil.
approved in 1911. Last previous edition approved in 2006 as A34/A34M – 06. DOI:
10.1520/A0034_A0034M-06R12.
6.1.2 When a test lot in coil form consists of several coils
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
sheared or slit from a master coil, the test strips shall be
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
prepared from test sheets representing one or both ends of the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. master coil.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
A34/A34M − 06 (2012)
6.1.3 When a test lot in coil form consists of several coils 7.1.1 Flat Strips:
having essentially the same treatment and composition, test
7.1.1.1 Except when otherwise established by mutual agree-
strips shall be prepared from test sheets cut from one or both
ment between the producer and the purchaser, the Epstein test
ends of enough master coils to be representative of the lot.
specimen shall be the standard specimen for determination of
the magnetic properties of flat-rolled electrical steels.
6.2 Electrical Steel Cut Lengths:
6.2.1 When cut lengths are sheared from coil material 7.1.1.2 Standard Epstein test specimens shall be composed
without subsequent treatments (such as roller leveling or cold
of test strips preferably cut from test sheets in a manner shown
rolling), the test on the original coil shall suffice. in Fig. 1 (a) or (b). One half of the strips are cut parallel to and
6.2.2 Two or more test sheets shall be taken from the same
the other half cut perpendicular to the direction of rolling.
lotofcutlengthsteelthathasbeencoldrolledorleveled.These
7.1.1.3 If the width of the material does not permit cutting
test sheets shall not lie adjacent to each other, but shall be
of strips perpendicular to the rolling direction, or, if the
selected in a manner to assure representative sampling.
material has preferred properties in any one direction with
respect to the direction of rolling, or, if the material is to be
6.3 Wrought Products Other Than Electrical Steels:
used with the flux in any one direction, all of the strips may be
6.3.1 Sampling shall be one sample per each heat applied to
cut in a specified direction which shall be agreed upon by the
the order unless otherwise specified in the appropriate ASTM
producer and the purchaser. All lengthwise strips may be
specification or by mutual agreement between the producer and
selected as shown in Fig. 1 (c).
purchaser.
7.1.1.4 When fewer than the total number of strips obtained
6.4 Amorphous Strip and Wire:
from the sampled area are needed for the test specimen, the
6.4.1 Sampling shall consist of one sample from each end of
excess strips should be discarded equally from all locations in
each continuously cast coil unless otherwise specified in the
the sampled area. For instance, if approximately ⁄4 of the total
appropriate ASTM specification or by mutual agreement be-
strips obtained is excess, every fourth strip should be dis-
tween the producer and purchaser.
carded.
6.5 Powder Metallurgically Produced Parts:
7.1.1.5 The Epstein test specimen shall consist of strips
6.5.1 Sampling shall consist of one sample per test lot
sheared or punched in a width of 3.00 cm [30.0 mm] and not
unless otherwise specified in the appropriate ASTM specifica-
less than 28.0 cm [280 mm] long. If for ease of assembling the
tion or by mutual agreement between the producer and
specimen in the test frame, it is desired to use strips slightly
purchaser.
longer than 28.0 cm [280 mm], a length of 30.5 cm [305
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