Home / Standards / GB/T 9948-2013 GB/T 9948-2013 Abolished Seamless steel tubes for petroleum cracking 石油裂化用无缝钢管 Standard Type GBT ICS 77.140.75 CCS H48 Status 废止 Issue Date 2013-09-18 Implementation 2014-07-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A