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发明公开
CN102851435A 一种超低碳、低硅和低氧钢及其冶炼方法 有权

一种超低碳、低硅和低氧钢及其冶炼方法
摘要：
本发明涉及一种超低碳、低硅和低氧钢及其冶炼方法。所述冶炼方法包括的步骤为：首先经过铁水脱硫预处理，控制铁水中S元素的质量百分数≤0.0050％；再通过控制转炉出钢C的质量分数≤0.04％，Si的质量百分数≤0.005％，T.O的质量百分数范围在0.04～0.08％，出钢时造碱度为3.0～4.0的高碱度炉渣，同时控制转炉出钢下渣量≤70mm；RH采取深脱碳处理模式，控制真空度＜100Pa的时间≥12min，控制合金调完后RH纯循环时间≥8min；控制RH精炼结束后镇静时间≥20min。本发明的优点在于，能生产出C≤0.0030％，Si≤0.01％，T.O≤0.0030％的铸坯。
摘要（英）：

The invention relates to ultra-low-carbon, low-silicon and low-oxygen steel and a smelting method thereof. The smelting method comprises the steps that: a molten iron desulphurization pretreatment is carried out, and S element mass percentage in the molten iron is controlled no higher than 0.0050%; steel converter tapping C mass percentage is controlled no higher than 0.04%, Si mass percentage is controlled no higher than 0.005%, and T.O mass percentage is controlled at 0.04-0.08%, high-alkalinity slag with alkalinity of 3.0-4.0 is produced during tapping; converter tapping slag quantity is simultaneously controlled no higher than 70mm; A deep decarburization treatment mode is adopted in RH, a time for a vacuum degree lower than 100Pa is controlled no shorter than 12min; an after-alloy-toning RH pure cycle time is controlled no shorter than 8min; after RH refining is finished, a sedation time is controlled no shorter than 20min. The method provided by the invention has the advantage that: with the method, cast slabs with C no higher than 0.0030%, Si no higher than 0.01%, and T.O no higher than 0.0030% can be produced.

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