ASTM C783-85(2015)
(Practice)Standard Practice for Core Sampling of Graphite Electrodes
Standard Practice for Core Sampling of Graphite Electrodes
SIGNIFICANCE AND USE
4.1 Core sampling is an acceptable way of obtaining a test specimen without destroying the usefulness of the electrode.
4.1.1 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.
4.2 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.
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Designation: C783 − 85 (Reapproved 2015) 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.
1. Scope Frequencies of Carbon and Graphite Materials by Sonic
Resonance
1.1 This practice was developed for electric-arc furnace
C1025 Test Method for Modulus of Rupture in Bending of
graphite electrodes, and covers a procedure and equipment for
Electrode Graphite
obtaining core samples from electrodes in a manner that does
C1039 Test Methods for Apparent Porosity, Apparent Spe-
not destroy the electrode nor prevent its subsequent use as
cific Gravity, and Bulk Density of Graphite Electrodes
originally intended. However, the minimum electrode
diameter, for which extraction of a core sample using this
3. Terminology
practice does not influence subsequent use, is influenced by the
3.1 Definitions:
particular application and must be determined by the user.
3.1.1 core sample— the portion of graphite obtained from
Graphite electrodes for use in electric arc furnaces are usually
an electrode by use of a sampling device such as described in
solid cylinders of graphite with threaded sockets machined in
4.1.
each end.
3.1.2 test specimen—anarticlepreparedfromacoresample.
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
4. Significance and Use
standard.
4.1 Core sampling is an acceptable way of obtaining a test
1.3 This standard does not purport to address all of the
specimen without destroying the usefulness of the electrode.
safety concerns, if any, associated with its use. It is the
4.1.1 Test specimens obtained by this practice can be used
responsibility of the user of this standard to establish appro-
byproducersandusersofgraphiteelectrodesforthepurposeof
priate safety and health practices and determine the applica-
conducting the tests in Note 1 to obtain comparative physical
bility of regulatory limitations prior to use.
properties.
NOTE 1—The followingASTM standards are noted as sources of useful
4.2 This practice may not provide a test specimen of the
information: Test Methods C559, C611, C651, C747, C1025, and C1039.
appropriatesize(withrespecttoparticlesize/sampledimension
ratios) to allow the determination of absolute property values.
2. Referenced Documents
5. Apparatus
2.1 ASTM Standards:
C559 Test Method for Bulk Density by Physical Measure-
5.1 Core Drill Bit, similar to that shown in Fig. 1, driven by
ments of Manufactured Carbon and Graphite Articles
suitable equipment.
C611 TestMethodforElectricalResistivityofManufactured
6. Procedure
Carbon and Graphite Articles at Room Temperature
NOTE 2—When core sampling a machined electrode, use caution to
C651 Test Method for Flexural Strength of Manufactured
prevent damage to the socket threads and remove all
...
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.
´1
Designation: C783 − 85 (Reapproved 2010) C783 − 85 (Reapproved 2015)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
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.
2. Referenced Documents
2.1 ASTM Standards:
C559 Test Method for Bulk Density by Physical Measurements of Manufactured Carbon and Graphite Articles
C611 Test Method for Electrical Resistivity of Manufactured Carbon and Graphite Articles at Room Temperature
C651 Test Method for Flexural Strength of Manufactured Carbon and Graphite Articles Using Four-Point Loading at Room
Temperature
C747 Test Method for Moduli of Elasticity and Fundamental Frequencies of Carbon and Graphite Materials by Sonic Resonance
C1025 Test Method for Modulus of Rupture in Bending of Electrode Graphite
C1039 Test Methods for Apparent Porosity, Apparent Specific Gravity, and Bulk Density of Graphite Electrodes
3. Terminology
3.1 Definitions:
3.1.1 core sample— the portion of graphite obtained from an electrode by use of a sampling device such as described in 4.1.
3.1.2 test specimen—an article prepared from a core sample.
4. Significance and Use
4.1 Core sampling is an acceptable way of obtaining a test specimen without destroying the usefulness of the electrode.
4.1.1 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.
4.2 This practice may not provide a test specimen of the appropriate size (with respect to particle size/sample dimension ratios)
to allow the determina
...
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