Home / Standards / GB/T 42678-2023 GB/T 42678-2023 Active Hot-rolled steel sections for petroleum and natural gas engineering 石油天然气工程用热轧型钢 Standard Type GBT ICS 77.140.70 CCS H44 Status 现行 Issue Date 2023-08-06 Implementation 2024-03-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A