Today we will introduce to you the whole production process of rolling steel.
The overall process of steelmaking can be divided into two types, one is long-process steelmaking, and the other is short-process steelmaking. The difference between the two methods is that the long process starts from iron ore (the main component is ferric oxide), and the short process starts from scrap steel and iron (you can add some molten steel).
Because the materials to be heated are different, the heating furnaces used are also different. A blast furnace is required for a long process, and a variety of electric furnaces, including an intermediate frequency furnace, can be used for a short process.
The basic tasks of steelmaking are mainly for decarburization, deoxidation, dephosphorization, desulfurization, and removal of gas from the materials to be treated. In fact, the purpose is to control various impurities to the required range, and at the same time introduce other metals to obtain the final required components.
We focus on short-process steelmaking.
The source of molten steel is an intermediate frequency furnace or an electric furnace, and the raw material is scrap steel and iron, plus some refining agents, recarburizers and other adjustment components; both the intermediate frequency furnace and the electric arc furnace use electricity, but the intermediate frequency furnace is converted into magnetized steel by electricity. , Generally, the tapping temperature is not higher than 1700 degrees, and the electric furnace directly introduces three motors to directly heat the scrap steel and scrap iron through the arc (up to 4000 degrees).
Generally, there are few unrefined ladles, and at least LF refining is required. Explain the 4 major refining methods:
LF refining: arc heating, raising the temperature and stirring molten steel with argon to achieve certain refining purposes;
AOD refining: often carried out in a converter, argon and oxygen are blown together, which can decarbonize (often in the process, the long process molten iron has high carbon content)
VOD refining: vacuum degassing, degas the entire ladle in a vacuum environment;
RH refining: Dip the ladle through the RH dip tube to create a vacuum condition in the tube, degassing.
VOD and RH are often used in stainless steel mills.
3. Tundish and continuous casting machine
The molten steel in the ladle enters the tundish through the nozzle for a buffer, and then flows into the continuous casting machine to be drawn into a billet.
This is our knowledge sharing about the steelmaking process today, I hope it can be helpful to you.
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