Technical measures to be taken in the production of low-phosphorus steel by converter: Warm and cold scarf and cold neck cover Hongxing Factory Winter Cold Neck Cover,Warm And Cold Scarf,Cold Neck Cover,Cold Neck Cover Dongying Hong Xing Labor Protection Products Co.,Ltd. , https://www.hongxinglabor.com
1, temperature control:
The converter molten pool should be uniformly heated. In the middle of the blowing, the temperature of the heating temperature is controlled by adjusting the amount of coolant added. The temperature of the molten steel at the end of the converter is controlled at 1630-1650 °C.
2. Alkalinity control:
In the early stage of smelting, it is necessary to ensure that the alkalinity of slag is ≥1.7, and it is reasonable to control the alkalinity of molten steel at the end of the converter at 3.0-4.0.
3. Control of w(FeO) content in slag:
For the smelting of low carbon steel slag w (FeO) content controlled between 18% and 30% is more favorable for dephosphorization.
4, slag quantity control:
Generally, the use of 1/3-1/2 slag is beneficial to the rapid formation of the early slag, which can improve the alkalinity of the initial slag and facilitate the dephosphorization in the early stage.
5, the steel slag control:
1) The converter is made of high alkalinity slag, and the slag or less slag is controlled as much as possible. Thus, even if the converter has a small amount of slag, the slag can be thickened due to a decrease in the temperature of the molten steel, and the activity of P in the slag is lowered.
2) When tapping, add 150-300kg of lime to the steel, thicken the slag under the converter, further increase the alkalinity of the slag, and make up for the slag change caused by system cooling and strong deoxidation.
3) After the slag failure, the amount of argon gas blown at the bottom of the ladle should be reduced to weaken the kinetic conditions provided by the outside. That is to avoid further melting of the thickened slag and reduce the diffusion of phosphorus back into the molten steel.
4) After refining, for the heat of the slag and the slag is obviously thinned, the appropriate amount of lime thickened slag should be added to change the slag property and further deoxidize.
6, reduce alloy phosphorus:
It is preferred to use low-cost, low-phosphorus alloys to minimize the effect of alloys on the phosphorus addition of molten steel. For example, the use of silicomanganese is better than ferrosilicon.
7, other:
For ultra-low phosphorus steel, the pre-dephosphorization of molten iron and the deep dephosphorization technology outside the furnace should be adopted to realize the production of ultra-low phosphorus steel.
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