Astm A 561 – 71 (Reapproved 1999) pdf free download

Standard Practice for
Macroetch Testing of Tool Steel Bars1

This standard is issued under the fixed designation A 561; 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.