Name: China Fasteners Railroad Clip SKL Rails Manufacturers Suppliers Factory - Gnee Steel
Brand: GNEE
SKU: 296987001

Fasteners Railroad Clip SKL Rails

Railway Clip is used to fasten the rails to the underlying base plate together with the concrete sleeper. A variety of different types of heavy-duty clips are used to fasten the rails to the underlying baseplate or Sleeper, one common being the E Clip, which is shaped like a stubby paperclip. Another one is the SKL Tension Clamp, which is also the most widely used type all over the world. Others like KPO Clamp and Nabla Clip, also used in different situations.

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Description

Technical Parameters

Rail SKL CLIP Fastening System

The SKL Clip is a precision-engineered tension clamp characterized by its omega-shaped (Ω) geometry, serving as the critical elastic component in modern rail fastening systems, particularly within the Vossloh W300 family. Manufactured from high-grade spring steel alloys including 60Si2MnA and 51CrV4 (DIN 17222), these clips function through controlled elastic deformation of their curved arms to generate calibrated clamping forces that secure the rail foot while absorbing dynamic wheel loads.

Technical Specifications:

Parameter	Standard Treatment	Premium Treatment	Heavy-Duty Treatment	Low-Temperature Treatment
Austenitizing Temp	850°C ± 10°C	860°C ± 5°C	870°C ± 5°C	840°C ± 5°C
Quenching Medium	Oil (50–60°C)	Polymer (40–50°C)	Oil (40–50°C)	Oil (60–70°C)
Tempering Temp	450°C ± 15°C	440°C ± 10°C	420°C ± 10°C	480°C ± 10°C
Tempering Time	60 minutes	75 minutes	90 minutes	60 minutes
Achieved Hardness	42–45 HRC	44–47 HRC	46–49 HRC	40–43 HRC
Tensile Strength	1,400–1,500 MPa	1,500–1,600 MPa	1,600–1,700 MPa	1,300–1,400 MPa
Impact Toughness	25–30J @ -20°C	30–35J @ -20°C	20–25J @ -20°C	35–40J @ -40°C
Best Application	General Purpose	High-Speed Passenger	Heavy Haul Freight	Arctic/Cold Regions

Installation & Maintenance Perspective:

Austenitization Temperature Control: During heat treatment, clips are heated to 840–880°C with ±5°C precision, ensuring complete transformation to austenite before quenching without grain coarsening that could reduce toughness.
Martensitic Transformation Management: Oil quenching at controlled rates (50–80°C/second) produces fine lath martensite structure with optimal hardness of 44–48 HRC while minimizing distortion and quench cracking risk.
Tempering Parameter Optimization: Tempering at 420–480°C for 60–90 minutes allows carbon diffusion that reduces brittleness while maintaining tensile strength, with the Hollomon-Jaffe parameter (P = T(20 + log t)) used to predict final properties.

Maintenance & Operational Perspective

Static Proof Load Testing: Production samples undergo 20–25 kN static load application for 60 seconds, with permanent set measured and limited to <0.5mm to verify elastic behavior within design limits.
High-Cycle Fatigue Validation: Representative clips are tested to 5–7 million cycles at 80–90% of maximum working load, with ultrasonic inspection at intervals to detect crack initiation before propagation.
Load-Deflection Curve Characterization: Each production batch includes samples tested on instrumented presses that generate complete force-deflection curves, verifying that clamping force falls within specified tolerance bands.

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Rail Shoulder Fastening System

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