Standard Test Method for
Metallographically Estimating the Observed Case Depth of
Ferrous Powder Metallurgy (P/M) Parts1

This standard is issued under the fixed designation B 931; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

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