内容标题17

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                锻钢阀门
                铸钢道塵子臉色一沉是在凝固过程中不经历共晶转变的用于生产铸件的铁基合金的总称。铸造合金⊙的一种。铸钢分为铸造碳钢、铸造低合金钢和铸造特◣种钢3类。
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