ASTM C783-85(2005)

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.
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.
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 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

• Status: Historical
• Publication Date: 31-May-2005
• ICS: 71.100.99 - Other products of the chemical industry
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.F0 - Manufactured Carbon and Graphite Products

Relations

• Replaces: ASTM C783-85(2000) - Standard Practice for Core Sampling of Graphite Electrodes
• Effective Date: 01-Jun-2005
• Replaced By: ASTM C783-85(2010)e1 - Standard Practice for Core Sampling of Graphite Electrodes
• Effective Date: 01-May-2010
• Referred By: ASTM D5679-16 - Standard Practice for Sampling Consolidated Solids in Drums or Similar Containers
• Effective Date: 01-Jun-2005
• Referred By: ASTM C1039-85(2020)e1 - Standard Test Methods for Apparent Porosity, Apparent Specific Gravity, and Bulk Density of Graphite Electrodes
• Effective Date: 01-Jun-2005
• Referred By: ASTM D6063-11(2018) - Standard Guide for Sampling of Drums and Similar Containers by Field Personnel
• Effective Date: 01-Jun-2005
• Referred By: ASTM C1025-15(2020) - Standard Test Method for Modulus of Rupture in Bending of Electrode Graphite
• Effective Date: 01-Jun-2005

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.
An American National Standard
Designation:C783–85(Reapproved 2005)
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 C747 Test Method for Moduli of Elasticity and Fundamen-
tal 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 diam-
cific Gravity, and Bulk Density of Graphite Electrodes
eter, for which extraction of a core sample using this practice
does not influence subsequent use, is influenced by the par-
3. Terminology
ticular 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 This standard does not purport to address all of the
3.1.2 test specimen—an article prepared from a core
safety concerns, if any, associated with its use. It is the
sample.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Significance and Use
bility of regulatory limitations prior to use.
4.1 Core sampling is an acceptable way of obtaining a test
NOTE 1—The followingASTM standards are noted as sources of useful
specimen without destroying the usefulness of the electrode.
information: Test Methods C559, C611, C651, C747, C1025, and C1039.
4.1.1 Test specimens obtained by this practice can be used
byproducersandusersofgraphiteelectrodesforthepurposeof
2. Referenced Documents
conducting the tests in Note 1 to obtain comparative physical
2.1 ASTM Standards:
properties.
C559 Test Method for Bulk Density by Physical Measure-
4.2 This practice may not provide a test specimen of the
ments of Manufactured Carbon and Graphite Articles
appropriatesize(withrespecttoparticlesize/sampledimension
C611 Test Method for Electrical Resistivity of Manufac-
ratios) to allow the determination of absolute property values.
tured Carbon and Graphite Articles at Room Temperature
C651 Test Method for Flexural Strength of Manufactured
5. Apparatus
Carbon and GraphiteArticles Using Four-Point Loading at
5.1 Core Drill Bit, similar to that shown in Fig. 1, dr
...