Heavy rails are large steel products, mainly used in places such as railway tracks that require high strength and stability. The following are common production technologies for heavy rails:
Steelmaking technology, the first step in heavy rail production is steelmaking, usually using converter steelmaking or electric furnace steelmaking processes. Raw materials such as iron ore and scrap steel are put into a converter or electric furnace, and through high-temperature smelting and a series of refining operations, impurities are removed and the chemical composition is adjusted to obtain molten steel that meets the requirements of heavy rail steel. Converter steelmaking has high production efficiency and is suitable for large-scale production; electric furnace steelmaking can better control the quality and composition of molten steel, especially suitable for the production of high-alloy heavy rail steel. Accurate control of the chemical composition of molten steel is crucial to the performance of heavy rails. For example, the content of elements such as carbon, manganese, and silicon is strictly controlled to ensure that the heavy rail has good strength, toughness, and wear resistance.
Continuous casting technology, the refined molten steel is poured into a continuous casting machine, and the molten steel is quickly solidified into a billet of a certain shape and size through a water-cooled crystallizer. During the continuous casting process, it is necessary to accurately control parameters such as the flow rate of molten steel, the vibration frequency of the crystallizer and the amount of cooling water to ensure the quality of the ingot. Continuous casting technology can improve production efficiency, reduce metal loss and reduce production costs. Compared with the traditional die casting process, the continuous casting ingot has better internal quality and surface quality, dense structure and small segregation, which provides good ingots for subsequent rolling production.