作废 JB/T 9211-1999
中碳钢与中碳合金结构钢马氏体等级 中碳钢与中碳合金结构钢马氏体等级 Martensite grade of medium-carbon steel and medium-carbon alloy structural steel
发布日期:1999-06-24
实施日期:2000-01-01
分类信息
标准简介
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最后更新时间 2025-08-30