Home / Standards / GB/T 23902-2021 GB/T 23902-2021 Active 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 Standard Type GBT ICS 19.100 CCS J04 Status 现行 Issue Date 2021-05-21 Implementation 2021-12-01 Responsible Dept 国家标准委 Drafting Unit 国家标准委