GB/T 38720-2020中碳钢与中碳合金结构钢淬火金相组织检验标准
英文:Microstructure examination of medium-carbon steel and medium-carbon alloy structural steel after quenching GB/T 38720...
英文:Microstructure examination of medium-carbon steel and medium-carbon alloy structural steel after quenching GB/T 38720...