Home / Standards / GB/T 43311-2023 GB/T 43311-2023 Active Design method for ductile iron pipes 球墨铸铁管设计方法 Standard Type GBT ICS 23.040.10 CCS H48 Status 现行 Issue Date 2023-11-27 Implementation 2024-06-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A