Home / Standards / GB/T 39520-2020 GB/T 39520-2020 Active Test method for determination the residual stress of spring by X-ray diffraction 弹簧残余应力的X射线衍射测试方法 Standard Type GBT ICS 21.160 CCS J26 Status 现行 Issue Date 2020-11-19 Implementation 2021-06-01 Responsible Dept 国家标准委 Drafting Unit N/A