Rail skl CLIP Fastening System
The SKL Clip is a precision-engineered tension clamp that serves as the elastic fastening component within modern railway track systems, distinguished by its omega-shaped (Ω) geometry that creates a progressive spring action. Manufactured from high-grade spring steel alloys including 60Si2CrA and C70 (DIN 17221), these clips function through a calibrated deflection mechanism that converts vertical and lateral train-induced forces into controlled elastic deformation, maintaining consistent clamping pressure across the rail foot.
Technical Specifications:
| Parameter | Standard Grade | Premium Grade | Heavy Haul Grade | Test Method |
|---|---|---|---|---|
| Material Grade | C70 (DIN 17221) | 60Si2CrA | 60Si2CrVA | Spectrographic Analysis |
| Carbon Content | 0.68–0.75% | 0.56–0.64% | 0.56–0.64% | Combustion Analysis |
| Tensile Strength | 1,400–1,500 MPa | 1,500–1,600 MPa | 1,600–1,700 MPa | Tensile Testing |
| Hardness Range | 42–45 HRC | 44–47 HRC | 45–48 HRC | Rockwell HRC |
| Proof Load | 18 kN | 20 kN | 22 kN | Static Load Test |
| Fatigue Life | 3 Million Cycles | 4 Million Cycles | 5 Million Cycles | Dynamic Testing Rig |
| Surface Treatment | Black Oxide | Dacromet 320 | Dacromet + Shot Peen | Coating Thickness Gauge |
| Application | Secondary Lines | Main Line Passenger | Heavy Freight Corridors | Per Project Specification |
Installation & Maintenance Perspective:
- Torque-Controlled Seating: Installation requires calibrated torque wrenches set to 200–250 Nm to achieve specified clamping force without over-stressing the clip material.
- Two-Stage Tensioning: Clips are initially seated in parked position, then driven to working position using hydraulic or manual tools with controlled impact force.
- Deflection Verification: Post-installation inspection measures the gap between clip leg and guide plate to confirm proper deflection range (typically 2–4 mm).
Maintenance & Operational Perspective
- Spring Steel Grades: Produced from C70 (DIN 17221) or 60Si2CrA with carbon content of 0.60–0.75% for optimal hardenability and fatigue resistance.
- Oil Quenching Process: Following hot forming, clips undergo oil quenching from 850–880°C to achieve martensitic structure with target hardness.
- Tempering Precision: Tempered at 420–480°C to reduce brittleness while maintaining tensile strength of 1,400–1,600 MPa.
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