Home / Standards / NB/T 20009.21-2014 NB/T 20009.21-2014 Active 压水堆核电厂用焊接材料 第21部分:安全级设备用碳钢手工电弧焊焊条 Standard Type NB ICS N/A CCS N/A Status Active Issue Date 2014-10-15 Implementation 2015-03-01 Centralized Committee N/A Issuing Authority N/A