China 'GB/T 20490-2023
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 20490-2023
Non-destructive testing of steel pipes Automatic ultrasonic detection of delamination defects in seamless and welded steel pipes 钢管无损检测 无缝和焊接钢管分层缺欠的自动超声检测
Issued Date:2023/8/6
Implemented Date:2024/3/1
Issued by:
The Standardization Administration of the People's Republic of China