Home / Standards / GB/T 20911-2007 GB/T 20911-2007 Active Semi finished products for forging - Tolerances on dimensions shape and mass 锻造用半成品尺寸、形状和质量公差 Standard Type GBT ICS 77.140.85 CCS J32 Status 现行 Issue Date 2007-04-18 Implementation 2007-11-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A