The SKL railway fastener system is like the "guardian" of the railway track, and the material it uses is the key to determining the strength of its "guardianship". Different materials have their own functions in the system with their unique properties.
60Si2MnA steel is the star material of the SKL fastener system. As a medium-carbon alloy spring steel, it has high yield strength and fatigue limit. It can still maintain stable mechanical properties under long-term repeated rolling by trains and is not easy to deform. It is often used to manufacture key components such as spring bars and bolts. For example, spring bars need to continuously provide buckle pressure, and the high elasticity and fatigue strength of 60Si2MnA are just right. However, it has a tendency to decarburize and overheat sensitivity, and the heat treatment process needs to be strictly controlled during production.
| 60Si2mna Chemical Composition | ||||||||
| C(%): | SI(%): | Mn(%): | S (%): | P (%): | Cr(%): | Ni(%): | Cu(%): | V(%): |
| 0.54～0.60 | 1.5～2.0 | 0.70～1.00 | ≤0.035 | ≤0.035 | ≤0.35 | ≤0.35 | ≤0.25 | 0.08～0.16 |
40Cr alloy steel is also a commonly used material. It has good comprehensive mechanical properties, and its strength, toughness and hardenability are relatively balanced. When manufacturing components such as gauge baffles, 40Cr can withstand the complex stress caused by train operation, ensure the stability of the gauge, avoid lateral displacement of the rails, and build a solid defense line for the safe operation of trains.
In addition, cast iron materials are also used in some bases, pads and other parts of the SKL system. Cast iron has low cost and excellent casting performance. It can be made into parts with complex shapes and has a certain shock-absorbing and noise-reducing effect. It can alleviate the impact of train operation on the track, reduce noise generation, and improve the comfort of the surrounding environment of the railway.
Engineering plastics such as nylon are used to manufacture insulating gaskets and other parts. This type of material has excellent insulation performance and can effectively prevent current leakage and ensure the normal operation of track circuits. At the same time, nylon also has good wear resistance and corrosion resistance, and can be used for a long time in harsh environments, extending the service life of insulating parts.
The SKL railway fastener system reasonably matches different materials to give full play to their respective advantages and jointly ensure the safe and stable operation of railway tracks. With the development of technology, more new materials with excellent performance will be used in the future, injecting new vitality into the railway industry.