Home / Standards / GB/T 9808-2008 GB/T 9808-2008 Abolished Seamless steel tubes for drilling 钻探用无缝钢管 Standard Type GBT ICS 77.140.75 CCS H48 Status 废止 Issue Date 2008-10-10 Implementation 2009-05-01 Responsible Dept 中国钢铁工业协会 Drafting Unit 中国钢铁工业协会