Steelmaking processes mainly include converter steelmaking technology and EAF steelmaking technology. Converter steelmaking is a common process in steelmaking. In the smelting process, impurities in the molten steel, such as sulfur and phosphorus, are removed through high-temperature combustion and oxygen injection. By controlling the amount of oxygen injected and production time, the oxygen atmosphere and reaction conditions inside the furnace are regulated to control the alloy composition and quality. Subsequently, the refined molten steel is transported to the rotary table via a ladle. After the rotary table rotates to the casting position, the molten steel is poured into the tundish. The tundish then directs the molten steel through nozzles to the individual molds where it cools and solidifies to form the cast billet. The production process of steel billets that integrates a phosphorus-removal converter with a medium-frequency furnace is an efficient method of steelmaking. During the phosphorus-removal converter stage, an appropriate amount of lime and oxygen are added, aiming primarily to remove excess phosphorus from the molten iron. In the medium-frequency furnace stage, electromagnetic induction heating is used to mix alloy elements with the molten iron. The medium-frequency furnace provides precise temperature control and a relatively uniform heating environment, which helps in achieving a uniform distribution of alloy elements in the molten steel. Various alloy elements, such as carbon, silicon, manganese, nickel, and chromium, can be added at this stage as required to achieve predetermined chemical compositions and mechanical properties. The scrap steel ratio for this stage of EAF steel production is approximately 40%.
Search
