China 'GB/T 23902-2021
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 23902-2021
Non-destructive testing - Ultrasonic testing - Time-of-flight diffraction technique as a method for detection and sizing of discontinuities 无损检测 超声检测 超声衍射声时技术检测和评价方法
Issued Date:2021/5/21
Implemented Date:2021/12/1
Issued by:
The Standardization Administration of the People's Republic of China