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.

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 1The following ASTM standards are noted as sources of useful information: Test Methods C559 , C611 , C651 , C747 , C1025 , and C1039 .

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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

Keywords

carbon; core; electrodes; graphite; sample; test specimens; Carbon; Core sampling; Graphite; Graphite electrodes; Sampling;

ICS Code

ICS Number Code 71.100.99 (Other products of the chemical industry)

DOI: 10.1520/C0783-85R10E01

ASTM International is a member of CrossRef.

ASTM C783