In the case of the same number of furnaces in the DC-LF furnace, the average service life of VD/VOD steel increased by 4.51 times per unit, which is equivalent to the 8.64 VD/VOD steel ladle produced in 1999 under the same cost using the same refractory material. In the year, the cost of refractory materials was saved 2.825 million yuan. More than one year of production practice shows that by suppressing the arc of the DC ladle furnace (DC-LF furnace), arc welding has made a significant contribution to the improvement of the service life of the VD/VOD ladle in the steelmaking branch and the reduction of the refining production cost. Sintered A-SiC is produced by sintering SiC ultrafine powder under pressureless conditions.
In the sintering process, self-bonding, fine-grained (less than 10Lm) SiC materials are formed with a relative density of 98%. This single-phase material has excellent high temperature properties such as oxidation resistance, creep resistance and high temperature strength. The traditional SiC kiln furniture is damaged due to its loss of strength due to oxidation, and because of its excellent oxidation resistance, sintered A-SiC has a small increase in oxidation weight in a 1100e steam environment, and exhibits extremely superior creep resistance at a temperature of 1600e. Denaturation effectively extends the service life of the kiln furniture. At the same time, sintered A-SiC also exhibits strong corrosion resistance and chemical resistance at high temperatures.
Sintered A-SiC has proven to be an excellent alternative to ceramics, refractory materials and super-heat-resistant stainless steels. It has been widely used in the high-temperature ceramic industry and has achieved good economic benefits. The furnace adopts the refractory fiber and the spraying technology The refractory fiber has the advantages of small heat capacity, low thermal conductivity, light weight, and good thermal shock resistance, and is the preferred material for fire-resistant insulation. However, in the construction of refractory fibres, the use of layer-laying, stack-laying and prefabricated block construction methods all present labor intensity, poor construction environment, and low efficiency, and the construction quality is poor, especially in the presence of joints. Poor performance, poor use, and high energy consumption.
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