耐火与石灰 ›› 2023, Vol. 48 ›› Issue (2): 20-23.

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全碳基质 DMT-20/T 型 MgO-C 砖 在 UHP 电炉上的使用


  

  1. 海城利尔麦格西塔材料有限公司,海城 114200
  • 出版日期:2023-04-10 发布日期:2023-04-06

Application of all-carbon matrix DMT-20/T MgO-C brick in UHP electric furnace

  1. Haicheng Lirr Magnesite Material Co.,Ltd.,Haicheng 114200,China
  • Online:2023-04-10 Published:2023-04-06

摘要: 介绍了采用特殊粒度级配和生产方法,并增加石墨配入量而制成的 UHP 电炉用全碳基质 DMT-20/T 型 MgO-C 砖。该砖具有优越的抗氧化性,优异的抗组织结构劣化性和很高的抗侵蚀性,在 FS-DS 钢厂 50t UHP 电炉热 点区和渣线部位使用,其寿命达 573 炉,比该厂过去最高炉龄的 350 炉提高 63.7%,其损毁速度比本公司的 DMT18A 型 MgO-C 砖降低 18%以上。用后残砖显微结构研究的结果表明:全碳基质 DMT-20/T 型 MgO-C 砖的脱碳层厚 度仅是传统的 DMT-18A 型 MgO-C 砖脱碳层的 0.2 ~ 0.3 倍,同时,该砖脱碳层与原砖层之间的基质内没有组织劣化 现象。这可保证该产品具有较高的耐用性,适合在 UHP 电炉上使用。

关键词: UHP 电炉, MgO-C 砖, 耐用性

Abstract: This paper introduces the all-carbon matrix DMT-20/T MgO-C brick for UHP electric furnace, which is made by adopting special grain size gradation and production method and increasing the amount of graphite. This brick has good resistance to oxidation, deterioration of tissue structure and erosion. It has been used in the hot area and slag line of 50 t UHP electric furnace in FS-DS steel plant, and its service life reaches 573 heats, which is 63.7% higher than that of 350 heats with the highest service life in the factory in the past, and its damage rate is 18% lower than that of our company's DMT-18A MgO-C brick. The results of microstructure study of residual brick show that the thickness of decarburized layer of all-carbon matrix DMT-20/T MgO-C brick is only 0.2~0.3 times that of traditional DMT-18A MgO-C brick, and there is no structure deterioration in the matrix between the decarburized layer and the original brick layer. This can ensure that the product has high durability and is suitable for use in UHP electric furnace.

Key words: UHP electric furnace, MgO-C brick, Durability

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