Home / Standards / GB/T 21833-2008 GB/T 21833-2008 Abolished Austenitic - Ferritic (duplex) grade stainless steel seamless tubes and pipes 奥氏体 铁素体型双相不锈钢无缝钢管 Standard Type GBT ICS 77.140.75 CCS H48 Status 废止 Issue Date 2008-05-13 Implementation 2008-11-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A