Description
Technical Parameters
Railway SKL Clips Performance Grading & Scene Adaptation
| Performance Grade | Model | Wire Diameter | Material | Key Performance Index | Typical Application Scene |
|---|---|---|---|---|---|
| Economy | SKL 12 | φ13mm | 38Si7 | Hardness: 40–45 HRC; Fatigue Life: ≥2.0×10⁶ cycles | Factory/Port Light Rail |
| Standard | SKL 1 / SKL 3 | φ13mm | 60Si2CrA | Hardness: 42–47 HRC; Fatigue Life: ≥3.0×10⁶ cycles | Regional Mainline Railway |
| Heavy-Duty | SKL 14 | φ13mm | 60Si2CrA | Hardness: 42–47 HRC; Clamping Force: 9–11 kN | Freight Mainline |
| High-Strength | SKL B 15 | φ15mm | 55SiMnVB | Hardness: 44–49 HRC; Fatigue Life: ≥4.5×10⁶ cycles | Heavy-Haul Railway |

Railway SKL Clips Full-Lifecycle Quality Inspection Requirements
| Inspection Stage | Inspection Item | Test Method | Acceptance Criterion |
|---|---|---|---|
| Incoming Material | Chemical Composition | Handheld XRF Analyzer | C: 0.55–0.65% (60Si2CrA); Si: 1.50–1.80% |
| Production Process | Hardness & Straightness | Rockwell Hardness Tester; Straightness Gauge | Hardness: ±1 HRC tolerance; Straightness: ≤0.1mm/m |
| Finished Product | Clamping Force & Coating Thickness | Clamping Force Tester; Magnetic Thickness Gauge | Clamping Force: ±5% tolerance; Coating (Hot-dip galvanizing): ≥75μm |
| In-Service Maintenance | Fatigue Crack & Corrosion | Ultrasonic Flaw Detector; Visual Inspection | No cracks ≥0.2mm; No red rust on coating |
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