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a3是什么材质
更新时间: 2020-12-02 13:50:06  

甲类钢。a3是过去的叫法,新牌号是q235-A。它的含碳量和强度与现在的20号钢、q235基本一样。这类钢材是使用最广泛的一种材料。a3的机械强度可以得到保证,硬度是HRC40-44。但是其化学成分却不十分稳定,磷、硫等杂质较多,所以一般a3并不适合热处理。由于a3的含碳量只有0.2%左右,所以不能直接进行淬火,须要先掺碳才可以。

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