In the SKL fastener system, 60Si2MnA steel plays an extremely critical role. It is a medium-carbon alloy spring steel, and with a series of unique properties, it has become an ideal material for the manufacture of railway fasteners.
| 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 |
60Si2MnA steel has high yield strength and fatigue limit, and can maintain good mechanical properties under long-term repeated loads of trains. It is not easy to deform or damage, providing a solid guarantee for the stable operation of the SKL fastener system. Its high hardenability enables the steel to obtain uniform and good performance during heat treatment, and even large-sized parts can be processed in place. At the same time, it has excellent plasticity and is easy to form during processing, and can be made into fasteners of various complex shapes. In addition, the price of this steel is relatively low, and the heat treatment operation process is simple, which effectively controls the production cost while ensuring product quality.
In the SKL fastener system, 60Si2MnA is widely used in the manufacture of key components such as spring bars and bolts. The spring bar needs to have high elasticity and fatigue strength to provide stable buckling pressure, and 60Si2MnA just meets this requirement; the bolt requires high strength and good toughness, and this steel can also do the job well.