Home / Standards / GB/T 3488.4-2022 GB/T 3488.4-2022 Active Hardmetals—Metallographic determination of microstructure—Part 4: Characterisation of porosity, carbon defects and eta-phase content 硬质合金 显微组织的金相测定 第4部分：孔隙度、非化合碳缺陷和脱碳相的金相测定 Standard Type GBT ICS 77.160 CCS H16 Status 现行 Issue Date 2022-10-12 Implementation 2022-10-12 Responsible Dept 中国有色金属工业协会 Drafting Unit N/A