Home / Standards / GB/T 18449.4-2009 GB/T 18449.4-2009 Abolished Metallic materials - Knoop hardness test - Part 4: Tables of hardness values 金属材料 努氏硬度试验 第4部分:硬度值表 Standard Type GBT ICS 77.040.10 CCS H22 Status 废止 Issue Date 2009-06-25 Implementation 2010-04-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A