3335| 5
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請(qǐng)教40CR材質(zhì)的軸正確的熱處理方法 |
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點(diǎn)評(píng)
請(qǐng)教一下,高頻和中頻淬火有什么區(qū)別?上次拿去淬火他們那個(gè)是中頻,說這個(gè)工件不能用中頻為什么?
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