Home / Standards / GB/T 40389-2021 GB/T 40389-2021 Active Sintered metal materials, excluding hardmetals—Measurement of surface roughness 烧结金属材料(不包括硬质合金) 表面粗糙度的测定 Standard Type GBT ICS 77.160 CCS H70 Status 现行 Issue Date 2021-08-20 Implementation 2022-03-01 Responsible Dept 中国有色金属工业协会 Drafting Unit N/A