With the increase of train speed, the requirements for the stability of railway track lines have gradually increased, and railroad tie plates have also undergone four improvements. Welding the backing plate with steel plate, the integrity is not high due to the welding seam of the welding backing plate, and the existence of the welding seam weakens the mechanical properties of the tie plates. Steel tie plates can replace group welding tie plates because of their good integrity and high mechanical properties. However, due to the long tie plates, the deformation of the steel tie plates is large, and the corrosion is serious, and the section steel parts also have the shortcomings that the production cannot meet the needs of the current track pad structure. People gradually turned to malleable cast iron tie plates with low deformability and low cost. Since the production of malleable cast iron is obtained by malleable annealing of white cast iron, this production method extends the production cycle and increases the production cost compared to the production process of directly obtaining castings in the as-cast state. Due to its excellent mechanical properties and good casting properties, ductile cast iron has attracted much attention. In the as-cast state, the iron ductile cast iron shim plates can be used instead of malleable cast iron tie plates. Ferritic ductile cast iron is used in the manufacture of rail accessories, such as subway line accessories railroad tie plates, fast track tie plates, rail anchors, passenger dedicated line tie plates, etc. due to its strong anti-vibration and impact resistance capabilities.
I hope that through the introduction of the above information, you can not only understand the development history of railroad tie plates, but also indirectly, increase your understanding of railroad tie plates. Of course, if you have any doubts about railroad tie plates, and you want to know more about it, you can contact our company directly. Kingrail Parts will recommend and provide suitable and practical railway parts according to the needs of railway construction and maintenance companies.