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ULTRA-LOW CARBON STEEL AND METHOD FOR CONTROLLING OXIDE INCLUSIONS IN ULTRA-LOW CARBON STEEL
ULTRA-LOW CARBON STEEL AND METHOD FOR CONTROLLING OXIDE INCLUSIONS IN ULTRA-LOW CARBON STEEL
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机译：超低碳钢及控制超低碳钢中氧化物夹杂的方法
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摘要
A method for controlling oxide inclusions in an ultra-low carbon steel, comprising the following steps: 1) converter smelting, ensuring, when stopping blowing, that a molten steel satisfies [O] = 450-600 ppm, and [C] = 0.01-0.05%; during steel tapping, ensuring that the thickness of ladle slag is less than or equal to 50 mm; in the early stage of steel tapping, adding lime 2.0-5.0 kg/t steel, and in the final satge, adding Al modifiers 0.5-2 kg/t steel, so as to modify and deoxidize top ladle slag, so that the top ladle slag satisfy [(wt% CaO)+(wt% MgO)]/(wt% Al 2O 3)=1.4-1.9, and the oxidizing components satisfy (wt% FeO)+(wt% MnO)≤8; 2) vacuum decarbonization treatment in an RH furnace; after the vacuum decarbonization treatment, adding Al to deoxidize and alloy the molten steel, the time of purity circulation of the molten steel being greater than 6 min; thereafter, adding a rare earth metal Ce, and performing purity circulation of the molten steel for 2-10 min, ending the vacuum treatment. Said control method reduces the danger of inclusions remaining in a steel, improves the surface quality of a cold-rolled finished product, and improves the steel blockade rate of the cold-rolled finished product.
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机译：一种用于控制超低碳钢中氧化物夹杂物的方法，包括以下步骤：1）转炉冶炼，确保在停止吹炼时钢水满足[O] = 450-600 ppm，并且[C] = 0.01 -0.05％;出钢时，应确保钢包渣的厚度小于或等于50毫米;在出钢初期，加入石灰2.0-5.0 kg / t钢，在最后一次浇渣中，加入Al改性剂0.5-2 kg / t钢，以对顶部钢包渣进行改性和脱氧，使顶部钢包炉渣满足[（wt％CaO）+（wt％MgO）] /（wt％Al 2 O 3 ）= 1.4-1.9，氧化成分满足（wt ％FeO）+（wt％MnO）≤8; 2）在RH炉中进行真空脱碳处理;真空脱碳处理后，加入Al对钢水进行脱氧和合金化处理，钢水的纯度循环时间大于6min。之后，添加稀土金属Ce，使钢水进行2-10分钟的纯度循环，结束真空处理。所述控制方法减少了夹杂物残留在钢中的危险，提高了冷轧成品的表面质量，并提高了冷轧成品的钢封锁率。
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