铸件

灰铁硬度低了如何补救?

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最近因炉前分析仪故障,做HT—250时碳当量过高,铸件硬度低,有什么办法可以补救吗?现在硬度HB110-130,能否达到HB160-170,铸件厚度100左右。
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可以把锰提高一点,或加一些废钢。
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