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The 13 steps you need to know about electric arc furnace steelmaking!

1.Feeding.The operation of adding hot metal or scrap steel to the electric arc furnace is the first step in the electric steelmaking operation.

 

  1. Slag formation.The operation of adjusting the slag composition, alkalinity and viscosity and the reaction ability of steel and iron production.

 

  1. Slag.In the electric arc furnace steelmaking, the slagging or slag slag operation is carried out in the smelting process according to different smelting conditions and purposes. When smelting with the single slag method, the oxidized slag must be slag at the end of the oxidation; when the slag is reduced by the double slag method, the original oxidized slag must be completely released to prevent phosphorus from being returned.

 

  1. Molten pool stirring.Energy is supplied to the molten metal pool to cause movement of the molten metal and slag to improve the kinetic conditions of the metallurgical reaction. The molten pool agitation can be achieved by means of gas, mechanical, electromagnetic induction and the like.

 

  1. Dephosphorization.A chemical reaction that reduces the amount of phosphorus in the molten steel. Phosphorus is one of the harmful impurities in steel. Steels containing more phosphorus are easily brittle when used at room temperature or lower, and are called “cold brittle”. The higher the carbon content in the steel, the more severe the brittleness caused by phosphorus. In general steel, the phosphorus content is not more than 0.045%, and high-quality steel requires less phosphorus.

 

  1. Electric bottom blowing electric arc furnace bottom blowing.The gas such as N2, Ar, CO2, CO, CH4, O2, etc. is blown into the molten pool of the furnace according to the process requirements through a nozzle placed at the bottom of the furnace to accelerate the melting and promote the metallurgical reaction process.

 

  1. Melting period.The melting period of steelmaking is mainly for open hearth and electric arc furnace steelmaking. The electric arc furnace steelmaking is called the melting period from the start of the energization until the furnace steel flower is completely melted, and the flat steelmaking is finished from the completion of the molten iron to the completion of the charge.

 

  1. Oxidation period and decarbonization period.The oxidation period of ordinary power electric arc furnace steelmaking usually refers to the process stage of melting, sampling and analysis of the furnace to the completion of oxidation. It is also thought to start with oxygen blowing or decarburization.

 

  1. Refinement period.The steelmaking process removes some elements and compounds that are harmful to the quality of the steel by slagging and other methods, and is chemically reacted into the gas phase or discharged into the slag to remove it from the molten steel. The continuous casting machine is cast in a continuous casting machine.

 

  1. Reduction period.In the ordinary power electric arc furnace steelmaking operation, the time from the completion of the oxidization at the end of the oxidation to the tapping is usually referred to as the reduction period. Its main task is to make reducing slag for diffusion, deoxidation, desulfurization, control of chemical composition and temperature adjustment. High power and ultra-power electric arc furnace steelmaking operations have eliminated the reduction period.

 

  1. Furnace refining.The steelmaking process of refining the molten steel in the steelmaking furnace (converter, electric arc furnace, etc.) to another vessel for refining is also called secondary metallurgy. The steelmaking process is therefore divided into two steps: primary refining and refining.

 

  1. Steel liquid mixing.Stirring of the molten steel during the refining process outside the furnace. It homogenizes the molten steel composition and temperature and promotes metallurgical reactions. Most metallurgical reaction processes are phase-interfacial reactions, and the rate of diffusion of reactants and products is a limiting step in these reactions.

 

  1. Ladle feeding wire.The wire is fed into the ladle by a wire-feeding deoxidizing, desulfurizing and fine-tuning powder, such as Ca-Si powder, or directly feeding aluminum wire, carbon wire, etc. for deep desulfurization, calcium treatment and fine tuning of molten steel. A method of components such as carbon and aluminum. It also has the function of cleaning molten steel and improving the morphology of non-metallic inclusions.

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