ASTM A 531 A 531M – 91 pdf free download
Standard Practice for Ultrasonic Examination of Turbine-Generator Steel Retaining Rings1 This standard is issued under the fixed designation A 531/A 531M; 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 …
