ASTM A 531/A 531M – 91 international standard

Standard Practice for Ultrasonic Examination of Turbine-Generator Steel Retaining Rings1

This well-known is issued underneath the fixed designation a 531/a 531m; the variety straight away following the designation suggests the year of unique adoption or, in the case of revision, the year of final revision. A number of in parentheses suggests the yr of ultimate reapproval. A superscript epsilon (e) indicates an editorial alternate because of the final revision or reapproval.

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