Home / Standards / GB/T 31925-2015 GB/T 31925-2015 Active Ultrasonic test methods of heavy wall thickness seamless steel pipes and tubes 厚壁无缝钢管超声波检验方法 Standard Type GBT ICS 77.040.20 CCS H26 Status 现行 Issue Date 2015-09-11 Implementation 2016-06-01 Responsible Dept 中国钢铁工业协会 Drafting Unit 中国钢铁工业协会