Railway Fasteners Steel Rail Nabla Clip

Model

Diameter

Material

Hardness

Clamping Force

Surface Treatment

Applicable Extreme Scene

Nabla-12-Sand

φ12mm

50CrVA

41–46 HRC

8–11 kN

Hot-dip galvanizing (≥95μm)

Desert Sandstorm Area

Nabla-14-Coast

φ14mm

60Si2MnA

43–48 HRC

12–15 kN

Dacromet (≥12μm) + Zinc Plating

Coastal Salt-Fog Area

Nabla-16-Cold

φ16mm

55SiMnVB

45–50 HRC

18–23 kN

Dacromet + Sealant (≥15μm)

-40℃ Cold Plateau Area

Nabla-15-HS-Cold

φ15mm

60Si2CrVA

46–52 HRC

16–20 kN

Ceramic Coating (≥20μm)

350km/h HSR Cold Zone

Nabla-10-Tunnel

φ10mm

60Si2MnA

40–45 HRC

7–9 kN

Epoxy Coating (≥65μm)

Humid Metro Tunnel

Inspection Stage

Key Item

Test Method

Acceptance Criterion

Sampling/Execution Rule

Tool/Reference

Incoming Check

Material & Environmental Compliance

Handheld PMI + RoHS Detector

C: 0.56–0.65% (60Si2MnA); Pb/Cd/Hg ≤1000ppm

5 pcs/batch

Portable PMI Analyzer; RoHS Tester

Extreme Condition Test

Sand Erosion & Heat Resistance

Sand Blasting Chamber + High-Temp Oven

Coating Loss ≤5% After 200h (50m/s Sand Speed); No Softening at 60℃

2 pcs/batch

Sand Erosion Tester; High-Temp Oven (-40℃~100℃)

Emergency Replacement

Quick Change Efficiency

Mock Emergency Operation

Replacement ≤22s/piece (1-person team)

10 pcs/500m track (quarterly drill)

Emergency Nabla Clip Toolkit

Long-Term Service

Force Retention & Corrosion

Portable Force Tester + Chloride Ion Detector

Clamping Force Retention ≥85% (3 Years); Chloride Ion Content ≤0.06%

4 pcs/km annually

Handheld Force Tester; Chloride Ion Detector

Batch Audit

Recyclability & Structure Integrity

Material Separation Test + X-Ray Flaw Detection

Recyclable Metal Content ≥95%; No Internal Defects (≥0.3mm)

2% of Batch (Min. 3 Pcs)

Material Separator; X-Ray Flaw Detector