Home / Standards / YB/T 157-1999 YB/T 157-1999 Abolished 电梯导轨用热轧型钢 Standard Type YB ICS N/A CCS N/A Status Abolished Issue Date 1999-08-19 Implementation 2000-01-01 Centralized Committee 国家冶金工业局 Issuing Authority 国家冶金工业局