Converter steelmaking method

Abstract

The invention discloses a converter steelmaking method and relates to the field of mechanical forging. The converter steelmaking method comprises the treatments of seven steps of molten iron pretreatment, molten iron blending, waste steel block loading, lancing setting, slag charging, tapping and drossing; the molten iron is desulfurized in an iron mixing car at low cost and high efficiency; a molten iron ladle car supplies the molten iron in such a manner that the steps of blast furnace molten iron receiving, transporting, buffering storage, converter molten iron blending and the like are all carried out in the molten iron ladle car, and therefore, the loss of the molten iron and the dissipation of heat are low and the energy sources are saved; the waste steel blocks are added to the converter and reutilized so that the resources are saved and a better environmental protection effect is achieved; a spray lance is inserted deeply into the molten iron to inject oxygen, and a redox reaction is performed between the molten iron and the slag, and the oxygen so that such impurities as phosphorus, sulfur and silicon can be removed efficiently; in the tapping process, an iron alloy is added to a steel ladle for deoxidization and alloying so that the produced steel is high in plasticity and not easy to crack in the rolling process; the residual slag is poured into a slag pot and can be transported to a cement plant for producing cement.

Description

technical field [0001] The invention belongs to the field of mechanical forging, and in particular relates to a converter steelmaking method. [0002] Background technique [0003] Converter steelmaking is mainly a steelmaking method based on liquid pig iron as raw material. It mainly relies on the physical heat of liquid pig iron in the converter and the heat generated by the chemical reaction between the components in the pig iron and the oxygen sent into the furnace to make the metal reach the level of tapping. The composition and temperature required, with the gradual acceleration of my country's industrialization construction, a large amount of high-quality steel is required, and a good smelting method is required to obtain high-quality steel. The Chinese patent No.: 201010232281.5 discloses a method of converter steelmaking, which is to add the returned ore into the converter and mix it with molten iron, insert the gas spray gun into the converter to blow air, add slag...

AI Technical Summary

Problems solved by technology

However, this invention cannot efficiently reduce the sulfur content in molten iron, reduce the loss of molten iron and the loss of heat in the process of adding molten iron, and cannot reuse scrap steel blocks to achieve energy conservation and environmental protection. It cannot efficiently remove phosphorus, Sulfur, silicon and other impurities, the plasticity of the produced steel is not strong, and cracks will occur during rolling