Description
Technical Parameters
Railway Nabla Clip Models
| Parameter | Nabla S (Light Rail/Tram) | Nabla M (Standard Mainline) | Nabla H (Heavy - Haul Railway) | Nabla HS (High - Speed Railway) |
|---|---|---|---|---|
| Model Designation | Nabla S | Nabla M | Nabla H | Nabla HS |
| Applicable Rail Profile | 22–30kg/m Light Rail/Tram Rail | 43–50kg/m UIC 54 Mainline Rail | 60–75kg/m Heavy - Haul Rail | 60kg/m High - Speed Rail (CRTS I/II) |
| Base Material | 50CrVA Spring Steel | 60Si2MnA Spring Steel | 55SiMnVB Alloy Spring Steel | 60Si2CrVA High - Strength Steel |
| Heat Treatment Process | Quenching (860–880℃) + Tempering (410–450℃) | Quenching (870–890℃) + Tempering (420–460℃) | Quenching (870–890℃) + Tempering (430–470℃) | Quenching (880–900℃) + Tempering (440–480℃) |
| Mechanical Properties | - Hardness: HRC 41–46- Tensile Strength: ≥1275 MPa- Yield Strength: ≥1175 MPa- Elongation (δ₅): ≥5.5% | - Hardness: HRC 43–48- Tensile Strength: ≥1370 MPa- Yield Strength: ≥1275 MPa- Elongation (δ₅): ≥5% | - Hardness: HRC 45–50- Tensile Strength: ≥1570 MPa- Yield Strength: ≥1470 MPa- Elongation (δ₅): ≥4.5% | - Hardness: HRC 46–52- Tensile Strength: ≥1765 MPa- Yield Strength: ≥1665 MPa- Elongation (δ₅): ≥4% |
Factory Inspection Checklist for Universal Railway Nabla Clips
| Inspection Category | Inspection Item | Inspection Method | Acceptance Criteria | Sampling Plan | Inspection Tool/Equipment | Record Requirement |
|---|---|---|---|---|---|---|
| Material Validation | Chemical Composition | Handheld PMI Spectrometer | Key elements (C, Si, Mn, Cr, V) meet the material standard of the model (e.g., 60Si2MnA for Nabla M) | 5 pcs per production batch | Portable PMI Analyzer | Record element content; attach test report |
| Material Validation | Heat Treatment Microstructure | Metallographic Microscope (400× Magnification) | Uniform tempered troostite + sorbite; no overheating, overburning, or coarse grains | 1 pc per production batch | Metallographic Microscope | Take microstructure photos; grade structure |
| Mechanical Performance | Hardness Test | Rockwell Hardness Tester (HRC Scale) | Hardness within the model's specified range (e.g., HRC 43–48 for Nabla M); 3 test points per clip | 10 pcs per production batch | Rockwell Hardness Tester | Record each test value; calculate average |
| Mechanical Performance | Fatigue Test | Fatigue Testing Machine (5 Million Cycles) | No fracture after 5 million load cycles; residual deformation ≤1 mm | 2 pcs per production shift | Fatigue Testing Machine | Record cycle count and deformation data |
| Dimensional Accuracy | Overall Length/Working Length | Digital Caliper (Accuracy: 0.01 mm) | Dimension deviation ≤±0.2 mm from the design value; 3 measurement points per clip | 20 pcs per production batch | Digital Caliper | Draw dimension deviation statistical chart |
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