This national standard specifies the instruments, equipments and test sample of ultrasonic examination for forged and rolled steel bars, requirements, method of examination, examination procedure, defects evaluation, quality grade, record and/or report of inspection result, etc..
This national standard is applicable to the examination of 20~250mm forged and rolled steel bars with ultrasonic pulse reflection method. It is also applicable to high-temperature alloy bar, but not applicable to austenite scorched steel bar.
1. Subject content and application scope
2. Reference standard
3 Reference test sample
4 Defectoscope and equipment
5. Personnel requirements
6 Test method and procedure
6.1 Test method
6.2 Test procedure
7. Evaluation of defects
7.1 Longitudinal wave
7.1.1 Single defect
7.1.2 Multiple defects
7.1.3 Sliver-shape defects
7.1.4 Bottom surface echo wave
7.1.5 Level of noise
7.2 Transverse wave
8 Quality grade of ultrasonic examination
9 Record and/or report of the test result
