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同級(jí)別的螺釘,鍍鋅和發(fā)黑 的強(qiáng)度問題 |
點(diǎn)評(píng)
講講機(jī)械鍍鋅的影響?
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點(diǎn)評(píng)
應(yīng)該是高強(qiáng)度螺栓 涉及電鍍的 就要想是否會(huì)氫脆
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