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发明公开
CN104404355A 一种抗震软钢中厚板坯的冶炼工艺 有权

一种抗震软钢中厚板坯的冶炼工艺
摘要：
本发明涉及一种抗震软钢中厚板坯的冶炼工艺，该工艺依次包括铁水预处理、转炉冶炼、RH真空精炼、LF炉精炼、板坯连铸。本发明控制该钢水的化学成分按重量百分比为：[C]≤0.01%，[Mn]：0.10%～0.60%，[Si]：0.10%～0.30%，[P]≤0.015%，[S]≤0.002%，[Alt]：0.020%～0.050%，[N]≤50ppm，[H]≤2.0ppm，余量为Fe及不可避免的杂质。铁水预处理采用镁粉和石灰复合喷吹法脱硫，转炉出钢采用铝脱氧，但不脱氧完全，需留适量氧保证RH真空脱碳；RH真空脱碳后，钢水在LF炉快速造渣深脱硫、合金化及钙处理；板坯连铸全过程采用保护性浇注、动态轻压下、电磁搅拌工艺，连铸坯中心偏析控制在C类1.0及以下。该冶炼工艺既满足抗震软钢超低碳、超低硫、低氮、低氢高纯净度钢水的要求，又能显著提高钢水收得率、钙处理和合金的收得率，最终降低生产成本。
摘要（英）：

The invention relates to a smelting process for an anti-knock mild steel medium-thickness slab. The process successively comprises pretreatment of hot metal, converter smelting, RH vacuum refining, LF furnace refining and slab continuous casting. The chemical components of the molten steel are controlled as follows in percentage by weight: 0-0.01% of C, 0.10-0.60% of Mn, 0.10-0.30% of Si, 0-0.015% of P, 0-0.002% of S, 0.020-0.050% of Alt, 0-50 ppm of N, 0-2.0 ppm of H and the balance of Fe and unavoidable impurities. The magnesium powder and lime compound blowing process is adopted in the pretreatment of hot metal for sulfur removal, and aluminum deoxidation is adopted in converter steel tapping, but the deoxidation is incomplete, and an appropriate amount of oxygen needs to remain to guarantee RH vacuum decarburization; after the RH vacuum decarburization, slagging deep desulfurization, alloying and calcium treatment are quickly carried out on the molten steel in an LF furnace; the protection pouring electromagnetic stirring process under dynamic soft pressing is adopted in the overall process of slab continuous casting, and the center segregation of the continuous casting is controlled to be C-type 1.0 or below. The smelting process can meet the requirements of ultra-low carbon, ultra-low sulfur, low nitrogen and low hydrogen high-purity molten steel for the anti-knock mild steel, and also can obviously improve the yield of the molten steel and the yield of calcium treatment and alloy, so that the production cost is finally reduced.

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