Home / Standards / GB/T 24590-2021 GB/T 24590-2021 Active Enhanced tubes for efficient heat exchanger 高效换热器用 特型管 Standard Type GBT ICS 77.140.75 CCS H48 Status 现行 Issue Date 2021-03-09 Implementation 2022-02-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A