Steelmaking method

Abstract

A steelmaking method includes: charging a first batch of molten iron into a milling ladle to obtain a preheated milling ladle; melting scrap steel in an electric arc furnace to obtain starting molten steel; and charging the preheated milling ladle with the starting molten steel to charge the starting molten steel into a converter, wherein no starting molten steel remains in the preheated milling ladle. The electric arc furnace, milling ladle, and converter are located within the same plant area of ​​the steel plant.

Claims

1. A steelmaking method, comprising: The first batch of molten iron is poured into the milling vessel to obtain the preheated milling vessel. An electric arc furnace melts scrap steel to obtain initial molten steel; the preheated ladle is filled with the initial molten steel to be loaded into a converter, and no initial molten steel remains in the preheated ladle; the converter is filled with the initial molten steel and a second molten iron to obtain primary molten steel, and the solidification temperature of the primary molten steel is lower than that of the initial molten steel; and the converter is filled with a third molten iron to obtain secondary molten steel, and the temperature of the secondary molten steel is higher than that of the initial molten steel. The electric arc furnace, the ladle, and the converter are located in the same area of ​​the steel plant, and the ratio of the first molten iron, the second molten iron, the third molten iron, and the initial molten steel is 0.8 to 1.6:1:3.8:5.

2.

2. The steelmaking method as described in claim 1, wherein: The temperature of the first molten iron is 1300°C to 1400°C; the temperature of the initial molten steel obtained from the electric arc furnace is 1590°C to 1620°C; the temperature of the initial molten steel in the preheated milling vessel is 1540°C to 1560°C; the solidification temperature of the initial molten steel is 1525°C; the solidification temperature of the primary molten steel is below 1470°C; the temperature of the primary molten steel is 1440°C to 1460°C; and the temperature of the secondary molten steel is 1490°C to 1510°C.

3. The steelmaking method as described in claim 1, wherein, Based on the total weight of the secondary steel liquid, the carbon content of the secondary steel liquid is 0.6% to 1.2% by weight.

4. The steelmaking method as described in claim 1, wherein, In the preheated milling vessel, the initial superheat of the molten steel is above 70°C.

5. The steelmaking method as described in claim 1, further comprising: The first refining furnace deoxidizes and / or carbonizes the starting molten steel; The blast furnace produces the first, second, and third molten iron; the agitator mixes and desulfurizes the initial molten steel, the second molten iron, and the third molten iron; a slag-removing device removes the desulfurization slag produced during desulfurization; the converter blows the secondary molten steel to obtain blown molten steel; the second refining furnace degasses the blown molten steel under vacuum to obtain refined molten steel; and a continuous casting device casts the refined molten steel to obtain steel billets.

6. The steelmaking method as described in claim 5, wherein, The electric arc furnace, the first refining furnace, the milling trough, the agitator, the slag rake, the converter, the second refining furnace, and the continuous casting equipment are sequentially arranged in series within the same plant area.

7. The steelmaking method as described in claim 5, wherein, The blast furnace is located within the same plant area and is connected in series before the agitator.

8. The steelmaking method as described in claim 5, wherein, The converter dephosphorizes and / or denitrifies the secondary steel molten steel.

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