Home / Standards / GB 9948-1988 GB 9948-1988 Abolished Seamless steel tubes for petroleum cracking 石油裂化用无缝钢管 Standard Type GB ICS 23.040.10 CCS H48 Status 废止 Issue Date 1988-09-20 Implementation 1990-01-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A