ASTM A418/A418M-15(2020) PDF

Scope: 1.1 This practice for ultrasonic examination covers turbine and generator steel rotor forgings covered by Specifications A469/A469M, A470/A470M, A768/A768M, and A940/ A940M. This practice shall be used for contact testing only. 1.2 This practice describes a basic procedure of ultrasonically inspecting turbine and generator rotor forgings. It does not restrict the use of other ultrasonic methods such as reference block calibrations when required by the applicable procurement documents nor is it intended to restrict the use of new and improved ultrasonic test equipment and methods as they are developed. 1.3 This practice is intended to provide a means of inspecting cylindrical forgings so that the inspection sensitivity at the forging center line or bore surface is constant, independent of the forging or bore diameter. To this end, inspection sensitivity multiplication factors have been computed from theoretical analysis, with experimental verification. These are plotted in Fig. 1 (bored rotors) and Fig. 2 (solid rotors), for a true inspection frequency of 2.25 MHz, and an acoustic velocity of

ASTM A418/A418M-15(2020) Referenced Document

ASTM A469/A469M Standard Specification for Vacuum-Treated Steel Forgings for Generator Rotors*， 2022-03-01 Update
ASTM A470/A470M Standard Specification for Vacuum-Treated Carbon and Alloy Steel Forgings for Turbine Rotors and Shafts*， 2024-04-21 Update
ASTM A768/A768M Standard Specification for Vacuum-Treated 12芒鈧??? Chromium Alloy Steel Forgings for Turbine Rotors and Shafts*， 2024-04-21 Update
ASTM A788/A788M Standard Specification for Steel Forgings, General Requirements
ASTM A940/A940M Standard Specification for Vacuum Treated Steel Forgings, Alloy, Differentially Heat Treated, for Turbine Rotors*， 2024-04-21 Update
ASTM E1065/E1065M Standard Practice for Evaluating Characteristics of Ultrasonic Search Units
ASTM E317 Standard Practice for Evaluating Performance Characteristics of Ultrasonic Pulse- Echo Examination Instruments and Systems Without the Use of Electronic Measurement Instruments

2020 ASTM A418/A418M-15(2020) Standard Practice for Ultrasonic Examination of Turbine and Generator Steel Rotor Forgings
2015 ASTM A418/A418M-15 Standard Practice for Ultrasonic Examination of Turbine and Generator Steel Rotor Forgings
2010 ASTM A418/A418M-10 Standard Practice for Ultrasonic Examination of Turbine and Generator Steel Rotor Forgings
2009 ASTM A418/A418M-09 Standard Practice for Ultrasonic Examination of Turbine and Generator Steel Rotor Forgings
2007 ASTM A418/A418M-07 Standard Practice for Ultrasonic Examination of Turbine and Generator Steel Rotor Forgings
2005 ASTM A418/A418M-05 Standard Test Method for Ultrasonic Examination of Turbine and Generator Steel Rotor Forgings
1999 ASTM A418-99(2003) Standard Test Method for Ultrasonic Examination of Turbine and Generator Steel Rotor Forgings
1999 ASTM A418-99 Standard Test Method for Ultrasonic Examination of Turbine and Generator Steel Rotor Forgings