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ASTM B931-09

Historical 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 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.


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 Oct. 1, 2003
Language en - English
Page Count 4
Revision Level 09
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