Home / Standards / GB/T 42670-2023 GB/T 42670-2023 Active Test method for Rockwell hardness of carbon materials 炭素材料洛氏硬度测定方法 Standard Type GBT ICS 29.050 CCS Q52 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