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在RH脱气装置中,当[C]<20ppm时,脱碳速度大幅度下降,因此,大批量生产[C]≤10ppm的超低碳钢有困难,除非设法增加脱碳速度。 川崎钢铁公司千叶厂3号RH脱气装置试验了在钢水中溶入氢气,在脱气槽内利用氢气沸腾的方法来促进脱碳反应,冶炼[C]≤10ppm的超低碳钢。氢气是在脱碳处理的后期以3～4标准立方米/分的速度吹入260吨RH的连通管中的钢水中。部分氢气溶解于钢水,使氢浓度大约达到 3ppm。氢的吹入使脱气槽内的压力升高4×10[3]～3×10[4]pa,由于抑制脱氢,使在5分钟内能将溶入的[H]上升到5ppm以上。在真空室内溶钢放出气泡,增加气体和金属液之间的界面。使在含
In the RH degasser, the decarburization rate drops sharply when [C] <20 ppm, so mass production of [C] ≤10 ppm of ultra-low carbon steel is difficult unless it is tried to increase the decarburization rate. Kawasaki Steel Co., Ltd. Chiba plant No. 3 RH degassing apparatus tested in the molten steel into hydrogen, hydrogen in the degassing tank boiling method to promote decarburization reaction, smelting [C] ≤ 10ppm ultra-low carbon steel. Hydrogen is blown into molten steel in a 260-ton RH communication pipe at a rate of 3 to 4 standard cubic meters per minute in the latter stage of decarburization. Part of the hydrogen dissolved in the molten steel, the hydrogen concentration of about 3ppm. By blowing hydrogen, the pressure in the degassing tank is increased by 4 × 10 [3] to 3 × 10 [4] pa, and the dissolved [H] can be increased to 5 ppm or more within 5 minutes by suppressing dehydrogenation . Dissolved steel in the vacuum chamber emits bubbles, increasing the interface between gas and liquid metal. Make it in