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一、前言推广以电厂灰为基的保护浇注后,由于保护渣中含C量降低,熔化速度变快,当钢液进入帽口时,保护渣已大部分熔化,粉状层很薄,故保温性能不如柳毛,因此如何加强顶部保温更有其重要意义。根据有关资料介绍,帽口顶部散热约占帽口散热总量的30％。特别是使用绝热板帽口后,由于帽口比减小,帽口实心高度低降,如不加强顶部保温,就有产生缩孔的危险。根据我们的试验,绝热板帽口,用无C发热剂+绝热盖板保温,可得到十分满意的结果。帽口收缩平坦,相当帽口线处C偏析可降至0-0.06％,经实际统计成材率可达到80.18％。但因该法,Al燃烧速度较快,往帽口顶部加盖板比较麻烦,一度出现质量不稳定,只适于坑注,为了克服上述缺点,提出了研制膨体发热剂试验。二,膨体发热剂的作用原理及物料组成。(A)我厂常用的几种发热剂
First, the introduction to promote power plant ash-based protection after pouring, due to the C content in the flux decreased, the melting faster, when the molten steel into the hat, the flux has been most of the melting, powder layer is thin, so Insulation performance than willow hair, so how to strengthen the top of the insulation is more important. According to the information, the top of the hat heat dissipation accounts for about 30% of the total heat dissipation. In particular, the use of insulated cap hatch, the cap ratio is reduced, hat down the solid height drop, if not to strengthen the top of the insulation, there is the risk of shrinkage. According to our test, the insulation cap hatch mouth, with no C agent + heat insulation cover insulation, can be very satisfied with the results. Cap contraction flat, quite cap mouth line C segregation can be reduced to 0-0.06%, the actual finished rate of up to 80.18%. However, because of this method, Al burns fast, it is troublesome to cover the top of the cap. Once the quality is unstable, it is only suitable for pit injection. In order to overcome the above shortcomings, it is proposed to develop a bulking heat-generating agent test. Second, the principle of bulk heating agent and material composition. (A) I plant several commonly used fever agent