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1 概述ＧＢ/Ｔ12 99— 2 0 0 0《合金工具钢》是对ＧＢ/Ｔ12 99— 1985《合金工具钢技术条件》的修订。该标准于 2 0 0 0年 10月 2 5日发布 ,2 0 0 1年 9月 1日正式实施 ,并自实施之日起代替ＧＢ/Ｔ12 99 1985。ＧＢ/Ｔ12 99— 2 0 0 0《合金工具钢》非等效采用美国材料与试验
1 Overview GB / T1299-2000 “alloy tool steel” is GB / T12 99- 1985 “alloy tool steel technical conditions” revision. The standard was released on October 25, 2000, and came into effect on September 1, 2001. The standard was replaced by GB / T12 99 1985 from the date of implementation. GB / T12 99-2000 “alloy tool steel” is not equivalent to the use of the United States materials and testing