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球墨450-10为什么铁水浇注会有黑泡?

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铁水浇注会有黑气泡,过后抛丸,会有气孔?怎么回事?急!谢谢!
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碳当量过高,同时此铁水球化不是很好,就容易出现黑渣盖。
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浇注的温度过低,增碳了吧
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黑气泡?求图求真相
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是气泡还是求化处理后产生的氧化物
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