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ASTM A247-24

Current Revision

Standard Test Method for Visual Evaluation of Graphite in Iron Castings

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1.1 This test method covers the classification of graphite in cast irons in terms of type, distribution, and size by visual comparison to reference photomicrographs. This test method is intended to be applicable for all iron-carbon alloys containing graphite particles, and may be applied to gray irons, malleable irons, compacted graphite irons, and the ductile (nodular) irons.

1.2 The reference photomicrographs included in this test method are in no way to be construed as specifications. In an appropriate specification for a specific material where graphite microstructure is an important consideration, this test method may be used as a reference to concisely define the graphite microstructure required.

1.3 These reference photomicrographs are offered primarily to permit accurate reporting of microstructures of cast irons and to facilitate the comparison of reports by different laboratories or investigators.

1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.5 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.

1.6 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 The comparison of observed graphite particles with the structures shown in the charts give only purely descriptive information on the type, distribution, and size of the graphite in the sample being evaluated. It does not indicate, except in a very broad way, the origin of the graphite or the suitability of the iron-carbon alloy for a particular service.

SDO ASTM: ASTM International
Document Number A247
Publication Date April 1, 2024
Language en - English
Page Count 13
Revision Level 24
Supercedes
Committee A04.21
Publish Date Document Id Type View
April 1, 2024 A0247-24 Revision
March 1, 2019 A0247-19 Revision
July 1, 2017 A0247-17 Revision
April 1, 2016 A0247-16A Revision
March 15, 2016 A0247-16 Revision
March 1, 2010 A0247-10 Revision
Nov. 15, 2006 A0247-06E01 Revision
Nov. 15, 2006 A0247-06 Revision
Aug. 25, 1967 A0247-67R98E01 Revision
May 10, 1998 A0247-67R98 Reaffirmation