IS THERE A NEED FOR A NEW STANDARD FOR DETERMINATION OF STEEL CLEANLINESS USING HIGH FREQUENCY ULTRASONIC TESTING?

Speaker:
Heckel, Thomas; BAM Bundesanstalt fur Materialforschung und -prufung; Germany

Authors:
Heckel, T.; Federal Institute for Materials Research and Testing (BAM); Germany
Perez Alonso, M.; SidenorInvestigación y Desarollo S.A.; Spain

ID: ECNDT-0215-2018
Download: PDF
Session: Qualification and standards 2
Room: J1
Date: 2018-06-14
Time: 16:20 - 16:40

High frequency ultrasonic testing of highly demanding steel is covered by standards like SEP 1927 and ASTM E588. For increasing market needs on steel for high demanding applications non-destructive methods for the determination of steel cleanliness using ultrasound an adaption of standards to increase sensitivity respectively may be an answer.

During the INCAFAT project modern requirements on standardization have been evaluated.

Due to the diversity in application needs a adapted standard should be open to different types of specimen and inspection frequencies to cover a wide range from bars, rings and plates as well as different inspection sensitivities.

For enhanced resolution the frequency range should be extended to higher frequencies. The use of focal beam probes only which should be selected according to the geometry of the specimen shall be mandatory.

Calibration procedures have to be improved significantly to allow proper sizing of indications. The recorded echo height shall be directly transferred into an equivalent disc shaped reflector by a proved calculation procedure taking distance amplitude curves as well as signal amplitude distribution and signal travel time into account.

An adapted standard should be open to the definition of the volume to be investigated and open to be selected by the user.

A new standard draft proposal taking these requirements into account has been filed in the frame of the INCAFAT project and is on discussion.

The work on the new standard draft proposal has been funded by the European Union Ref.-Nr. RFSR-CT-2013-00014.