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ASTM B931-23

Current Revision

Standard Test Method for Metallographically Estimating the Observed Case Depth of Ferrous Powder Metallurgy (PM) Parts

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1.1 A metallographic method is described for estimating the observed case depth of ferrous powder metallurgy (PM) parts. This method may be used for all types of hardened cases where there is a discernible difference between the microstructure of the hardened surface and that of the interior of the part.

1.2 With the exception of the values for grit size for which the U.S. standard designation is the industry standard, the values stated in SI units are to be regarded as 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4 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.


5.1 The engineering function of many PM parts may require an exterior portion of the part to have a hardened layer. Where case hardening produces a distinct transition in the microstructure, metallographic estimation of the observed case depth may be used to check the depth to which the surface has been hardened.

SDO ASTM: ASTM International
Document Number B931
Publication Date Feb. 1, 2023
Language en - English
Page Count 3
Revision Level 23
Supercedes
Committee B09.05
Publish Date Document Id Type View
Feb. 1, 2023 B0931-23 Revision
Sept. 1, 2014 B0931-14R18E01 Revision
Sept. 1, 2014 B0931-14 Revision
Oct. 1, 2003 B0931-09 Revision
Oct. 1, 2003 B0931-03 Revision