China National Standards

China Metallic materials—Knoop hardness GB Standards List

  •  China "Metallic materials—Knoop hardness" GB Standards List:
    • Standard  Code Standard Title Standard Class Order
    GB/T 18449.4-2022 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    		 China National Standards
    Metallic materials—Knoop hardness
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