Home / Standards / GB/T 13299-2022 GB/T 13299-2022 Active Determination of free cementite, pearlite and Widmanstaten structure in steel 钢的游离渗碳体、珠光体和魏氏组织的评定方法 Standard Type GBT ICS 77.040.99 CCS H24 Status 现行 Issue Date 2022-07-11 Implementation 2023-02-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A