| 摘要 |
Unkilled steel is transferred, substantially without slag, from the refining reactor to a degassing reactor. The pressure in the degassing reactor is reduced to not more than 200 mm. Hg, and calcium carbide is added in a quantity such that calcium added is from 1 to 2 kg. per ton of steel. A vacuum is maintained for 10 to 20 minutes and then released. Preferably, the calcium carbide additive contains 5 to 25% by weight of calcium fluoride.
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