Home / Standards / GBT 31925-2015 GBT 31925-2015 Ultrasonic test methods of heavy wall thickness seamless steel pipes 厚壁无缝钢管超声波检验方法 Ultrasonic test methods of heavy wall thickness seamless steel pipes Standard Type GBT ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A