ASTM C783-85(2010)e1
(Practice)Standard Practice for Core Sampling of Graphite Electrodes
Standard Practice for Core Sampling of Graphite Electrodes
SIGNIFICANCE AND USE
Core sampling is an acceptable way of obtaining a test specimen without destroying the usefulness of the electrode.
Test specimens obtained by this practice can be used by producers and users of graphite electrodes for the purpose of conducting the tests in Note 1 to obtain comparative physical properties.
This practice may not provide a test specimen of the appropriate size (with respect to particle size/sample dimension ratios) to allow the determination of absolute property values.
SCOPE
1.1 This practice was developed for electric-arc furnace graphite electrodes, and covers a procedure and equipment for obtaining core samples from electrodes in a manner that does not destroy the electrode nor prevent its subsequent use as originally intended. However, the minimum electrode diameter, for which extraction of a core sample using this practice does not influence subsequent use, is influenced by the particular application and must be determined by the user. Graphite electrodes for use in electric arc furnaces are usually solid cylinders of graphite with threaded sockets machined in each end.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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.
Note 1—The following ASTM standards are noted as sources of useful information: Test Methods C559, C611, C651, C747, C1025, and C1039.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
´1
Designation: C783 − 85(Reapproved 2010) An American National Standard
Standard Practice for
Core Sampling of Graphite Electrodes
This standard is issued under the fixed designation C783; 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.
ε NOTE—Updated units of measurement throughout the standard editorially in May 2010.
1. Scope C747 Test Method for Moduli of Elasticity and Fundamental
Frequencies of Carbon and Graphite Materials by Sonic
1.1 This practice was developed for electric-arc furnace
Resonance
graphite electrodes, and covers a procedure and equipment for
C1025 Test Method for Modulus of Rupture in Bending of
obtaining core samples from electrodes in a manner that does
Electrode Graphite
not destroy the electrode nor prevent its subsequent use as
C1039 Test Methods for Apparent Porosity, Apparent Spe-
originally intended. However, the minimum electrode
cific Gravity, and Bulk Density of Graphite Electrodes
diameter, for which extraction of a core sample using this
practice does not influence subsequent use, is influenced by the
3. Terminology
particular application and must be determined by the user.
3.1 Definitions:
Graphite electrodes for use in electric arc furnaces are usually
3.1.1 core sample— the portion of graphite obtained from
solid cylinders of graphite with threaded sockets machined in
an electrode by use of a sampling device such as described in
each end.
4.1.
1.2 The values stated in SI units are to be regarded as
3.1.2 test specimen—anarticlepreparedfromacoresample.
standard. No other units of measurement are included in this
standard. 4. Significance and Use
1.3 This standard does not purport to address all of the
4.1 Core sampling is an acceptable way of obtaining a test
safety concerns, if any, associated with its use. It is the specimen without destroying the usefulness of the electrode.
responsibility of the user of this standard to establish appro-
4.1.1 Test specimens obtained by this practice can be used
priate safety and health practices and determine the applica- byproducersandusersofgraphiteelectrodesforthepurposeof
bility of regulatory limitations prior to use.
conducting the tests in Note 1 to obtain comparative physical
properties.
NOTE 1—The followingASTM standards are noted as sources of useful
information: Test Methods C559, C611, C651, C747, C1025, and C1039.
4.2 This practice may not provide a test specimen of the
appropriatesize(withrespecttoparticlesize/sampledimension
2. Referenced Documents
ratios) to allow the determination of absolute property values.
2.1 ASTM Standards:
5. Apparatus
C559 Test Method for Bulk Density by Physical Measure-
ments of Manufactured Carbon and Graphite Articles
5.1 Core Drill Bit, similar to that shown in Fig. 1, driven by
C611 TestMethodforElectricalResistivityofManufactured suitable equipment.
Carbon and Graphite Articles at Room Temperature
6. Procedure
C651 Test Method for Flexural Strength of Manufactured
NOTE 2—Whe
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