In the railway fastener system, 60Si2CrA is a highly favored high-quality material, and its excellent performance provides strong support for the safe and stable operation of railway tracks.
From the perspective of chemical composition, 60Si2CrA is a medium-carbon alloy spring steel. "60" means that the average carbon content is about 0.6%. The higher carbon content gives it higher strength and hardness. "Si2" means that the silicon content is about 2%, which can significantly improve the elastic limit, yield strength and fatigue strength of steel; "CrA" means the addition of chromium, which enhances the hardenability and tempering stability of steel, and improves corrosion resistance. The synergistic effect of each element gives 60Si2CrA excellent comprehensive mechanical properties.
Chemical composition
Sulfur S: ≤0.030
Phosphorus P: ≤0.030
Chromium Cr: 0.70～1.00
Nickel Ni: ≤0.35
Copper Cu: ≤0.25
60Si2CrA has significant advantages in performance. It has a high elastic limit and can maintain stable elastic deformation under long-term stress. For key components such as spring bars in railway fastener systems, it can provide stable buckling pressure for a long time, firmly fix the rails and prevent rail displacement. The material has excellent fatigue strength. During railway operation, fasteners are subjected to alternating stress from trains for a long time. 60Si2CrA can effectively resist fatigue damage and greatly extend its service life. Moreover, after proper quenching and tempering treatment, the hardness and toughness of 60Si2CrA are well balanced, which not only ensures the wear resistance of the components, but also avoids brittle fracture due to excessive hardness.
Mechanical properties
Tensile strength σb (MPa): ≥1764(180)
Yield strength σs (MPa): ≥1568(160)
Elongation δ5 (%): ≥6
Shrinkage ψ (%): ≥20
Hardness: Hot rolling + heat treatment, ≤321HB; Cold drawing + heat treatment, ≤321HB
In the railway field, 60Si2CrA has a wide range of applications. Especially in high-speed railways and heavy-duty railways, the performance requirements of fasteners are extremely high. On high-speed railways, trains run at high speeds and have strict requirements on track stability. 60Si2CrA material spring bars rely on stable buckle pressure and good elasticity to ensure the precise position of the rails at high speeds; heavy-duty railways have large transport loads. 60Si2CrA, with its high fatigue strength and excellent load-bearing capacity, can withstand repeated rolling and impact of heavy-duty trains and ensure the reliability of the track structure. In addition, in urban rail transit, facing the complex stress caused by the frequent start and stop of trains, fasteners made of 60Si2CrA can also play a stable role, reduce maintenance frequency and reduce operating costs.
