The production process of German standard rail steel
Rail steel is an excellent steel that is widely used in engineering fields such as railways, subways, highways and bridges. As an excellent steel, the production process of German standard rail steel has excellent characteristics and requirements. This article will introduce the production process of German standard rail steel in detail, including its raw material selection, production process and quality control.
First, the selection of raw materials.
The raw materials of German standard rail steel mainly include iron ore, scrap steel and alloying elements. In order to ensure the quality and performance of the steel, the raw materials of German standard rail steel must undergo strict screening and quality control. The quality of iron ore has a significant impact on the properties of steel, so it is necessary to choose iron ore with high grade and few impurities. Scrap steel is one of the important raw materials in steel production, and its quality also needs to be strictly controlled. Alloying elements are one of the important factors affecting the properties of steel, so their types and contents also need to be selected and controlled according to specific requirements.
Second, the production process.
The production process of German standard rail steel mainly includes the following steps: ironmaking, steelmaking, continuous casting and rolling.
1.Ironmaking.
Ironmaking is a previous step in the production of rail steel, where raw materials such as iron ore and scrap steel are smelted into molten iron, mainly through blast furnace smelting. In this process, the temperature and composition need to be controlled to ensure the quality and stability of the molten iron.
2.Steelmaking.
Steelmaking is the process of refining molten iron into molten steel through redox reactions. In this process, an appropriate amount of alloying elements needs to be added to adjust the chemical composition of the steel to meet the standard requirements of German standard rail steel. At the same time, the temperature and atmosphere need to be controlled to ensure the quality and stability of the molten steel.
3.Continuous casting.
Continuous casting is the process of continuously casting molten steel into billets of different specifications. In this process, the temperature and speed need to be controlled to ensure the quality and dimensional accuracy of the billet. At the same time, it is also necessary to carry out first-class inspection and control to ensure that the quality of the billet meets the requirements.
4.Rolling.
Rolling is the process of rolling a continuously cast billet into steel of different specifications. In this process, parameters such as temperature, rolling force, and amount of deformation need to be controlled to ensure the quality and dimensional accuracy of the steel. At the same time, processes such as surface treatment and coating are also required to improve the corrosion and wear resistance of the steel.