Home / Standards / GB/T 34205-2017 GB/T 34205-2017 Active Metallic materials—Hardness testing—Ultrasonic contact impedance method 金属材料 硬度试验 超声接触阻抗法 Standard Type GBT ICS 77.040.10 CCS H22 Status 现行 Issue Date 2017-09-07 Implementation 2018-06-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A