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HT250生产中怎样才能保证A型石墨的数量大于90%?

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各位大师,HT250生产中怎样才能保证A型石墨的数量大于90%。客户这样的要求对铸造厂来说是不是风险性太大。
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A型石墨数大于90%,在冲天炉熔炼中,除成分温度合适外,必须使用合金孕育剂,多次孕育,最保险加0.5%的Cu,在电炉情况下,不用加Cu,但要过包孕育,普通孕育剂即可,以上两种方法我都试过,样件送台企检测100%合格,现批量生产了。试下吧。
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注意管控原材料、孕育、浇注。
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原铁水和孕育以后的铁水,液淬检查未熔石墨的形态、大小、数量。这是一项石墨形态、长度的几倍因素。如果不容忽略,那么任何孕育都可能回天乏力。
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高温铁液,使用硅钡孕育剂多次孕育,随流孕育
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