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用容量为10公斤的真空感应炉研究了在电熔氧化鎂坩堝中熔炼純鉄时熔池中碳和氧的反应,以及坩堝在这个反应中所起的作用。証实在熔炼过程中坩堝不断向熔池供氧,因此熔池的含氧量在降低到最低值后重新回升。在10~(-4)(及10~(-1))毫米汞柱的炉压下,发現熔池中的[％C]·[％O]乘积都达到6×10~(-6)至3.5×10~(-5)之間的数值。当配料含碳0.03—0.05％而含氧为其一半时,可以得到含碳0.006％以下、含氧0.003％以下的高純度铁。坩堝对熔池的影响随着使用次数的增长而減弱。熔池的氧浓度对最終含氮量有显著影响。含氧量越高,脫氮就越慢。
The reaction of carbon and oxygen in the molten pool while melting pure cast iron in a fused magnesia crucible and the role played by the crucible in this reaction were investigated using a vacuum induction furnace with a capacity of 10 kg. Confirmed in the smelting process crucible constantly oxygen supply to the pool, so the oxygen content in the pool after the minimum to a new rebound. It was found that the product of [% C] · [% O] in the molten pool reached 6 × 10 -6 at 10 -4 (and 10 -1) mmHg, To 3.5 × 10 ~ (-5) between the value. When the ingredients contain 0.03-0.05% of carbon and half of oxygen, high-purity iron containing 0.006% or less of carbon and 0.003% or less of oxygen can be obtained. The impact of the crucible on the weld pool diminishes as the number of uses increases. The oxygen concentration in the bath has a significant effect on the final nitrogen content. The higher the oxygen content, the slower the denitrification.