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发明公开
CN102002553A 一种中低牌号冷轧无取向硅钢钢水的脱硫方法 有权

一种中低牌号冷轧无取向硅钢钢水的脱硫方法
摘要：
本发明涉及一种中低牌号冷轧无取向硅钢钢水的脱硫方法，它包括下述依次的步骤：I转炉出钢后脱氧将预处理铁水倒入转炉冶炼后转炉出钢，出钢过程中加入石灰、预熔渣与铝铁，出钢后向钢包内加石灰、预熔渣与铝丸，吹氩气强搅拌脱氧；II LF脱硫在LF工位，取样分析钢水中碳≤0.05％；送电并底吹氩，停电后吹氩强搅拌，取样分析；III RH脱碳在RH工位，抽真空取样分析钢水中碳含量与铝含量；吹氧量为：O2(Nm3)＝钢水量(吨)×0.4+{[C]％+[Al]％}×103；真空下循环，钢水中碳含量[C]≤0.0020％时，加铝后取样，钢水中C含量不大于0.0025％时，IVRH合金化。本发明的中低牌号冷轧无取向硅钢钢水中硫可降20ppm以下。
摘要（英）：

The invention relates to a desulfurization method of medium and low grade cold rolling non-oriented molten silicon steel, which comprises the following steps of: (1) deoxidizing after tapping of a rotary furnace, pouring pretreated hot metal into the rotary furnace, smelting, tapping, adding lime, premelted slag and aluminum iron during the tapping process, adding lime, premelted slag and aluminum pills into steel ladles after tapping, blowing argon gas and deoxidizing while strongly agitating; (2) low-frequency desulfurizing at low frequency station, sampling, analyzing that carbon in molten steel is not greater than 0.05%, delivering power, blowing argon gas from bottom, agitating, cutting off power, blowing argon gas while strongly agitating, sampling and analyzing; and (3) relative-humidity decarburizing at relative humidity station, vacuumizing, sampling and analyzing carbon content and aluminum content in molten aluminum, wherein the blowing oxygen content is O<2>(Nm<3>)=molten steel quantity (ton)*0.4+{[C]%+[Al]}*10<3>; circulating in vacuum, sampling after adding aluminum when the carbon content [C] in molten steel is not greater than 0.0020%, and IVRH alloying when the C content in molten steel is not greater than 0.0025%. Sulfur in the medium and low grade cold rolling non-oriented molten silicon steel can be reduced to below 20 ppm.

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