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ASTM C748-20

Current Revision

Standard Test Method for Rockwell Hardness of Graphite Materials

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1.1 This test method covers Rockwell L scale hardness testing of graphite materials with grain size less than 0.8 mm and a hardness range between 0 and 120.

1.2 Test Methods E18 shall be followed except where otherwise indicated.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


4.1 A Rockwell L scale hardness number is a number derived from the net increase in depth of impression as the load on a 6.3500 mm ± 0.0025 mm diameter steel-ball indenter is increased from a fixed 10 kg minor load to a 60 kg major load and then returned to the minor load.

4.2 A Rockwell hardness number is directly related to the indentation hardness of a material; the higher the Rockwell L scale reading, the harder the material. The test is useful in the evaluation and the manufacturing control of carbon and graphite materials.

SDO ASTM: ASTM International
Document Number C748
Publication Date May 1, 2020
Language en - English
Page Count 3
Revision Level 20
Supercedes
Committee D02.F0
Publish Date Document Id Type View
May 1, 2020 C0748-20 Revision
March 10, 1998 C0748-98 Revision
Oct. 1, 2015 C0748-98R15 Reaffirmation
May 1, 2010 C0748-98R10E01 Reaffirmation
May 1, 2005 C0748-98R05 Reaffirmation