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METHOD FOR REDUCING SULFUR IN MOLTEN STEEL BY CONTROLLING INJECTION QUANTITY OF SLAG DEOXIDIZER, Al CONTENT IN MOLTEN STEEL, CaO/Al2O3 RATIO IN SLAG AND GAS FLOW RATE DURING VACUUM DEGASSING
METHOD FOR REDUCING SULFUR IN MOLTEN STEEL BY CONTROLLING INJECTION QUANTITY OF SLAG DEOXIDIZER, Al CONTENT IN MOLTEN STEEL, CaO/Al2O3 RATIO IN SLAG AND GAS FLOW RATE DURING VACUUM DEGASSING
PURPOSE: To provide a method for injecting slag deoxidizer after tapping completion and controlling Al content in molten steel, CaO/Al2O3 ratio in slag and gas flow rate during vacuum degassing treatment, thereby stably reducing content of sulfur in molten steel contained in vacuum tank degasser to reduce internal quality defects of slab, coil and plate due to center segregation of sulfur in molten steel. CONSTITUTION: In a method for refining molten steel, the method for desulfurizing molten steel in a vacuum tank degasser comprises a step of injecting 0.2 to 0.5 kg of slag deoxidizer per ton of molten steel into molten steel that completed tapping from a converter; a step of controlling content of aluminum to 0.050 to 0.060 wt.% by adding aluminum to molten steel; a step of controlling a CaO/Al2O3 ratio in slag in a ladle to 2.0 to 2.5; and a step of performing degassing treatment on molten steel in the vacuum tank degasser while blowing one gas selected from Ar gas and N2 gas into molten steel in a flow rate of 0.060 to 0.152 Nm¬3/hr per ton of molten steel.
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机译：目的：提供一种在出钢完成后注入炉渣脱氧剂并控制钢水中铝含量，炉渣中CaO / Al2O3比和真空脱气处理过程中气体流量的方法，从而稳定地降低真空罐脱气机中钢水中的硫含量。减少由于钢水中硫的中心偏析而导致的板坯，卷材和板材的内部质量缺陷。构成：一种精炼钢水的方法，该方法是在真空罐脱气机中对钢水进行脱硫，该方法包括以下步骤：将每吨钢水0.2至0.5 kg的炉渣脱氧剂注入完成从转炉出钢的钢水中;通过向钢水中添加铝，将铝的含量控制为0.050〜0.060重量％的步骤。将钢包中的炉渣中的CaO / Al 2 O 3的比例控制为2.0〜2.5的步骤。在真空罐脱气机中对钢水进行脱气处理的步骤是，以每吨钢水0.060〜0.152Nm 3 / hr的流量将选自Ar气和N 2气中的一种气体吹入钢水中。
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