Railway Elastic Strip/ Fastening Clip/Rail Fastening Clip

Railway Elastic Strip/ Fastening Clip/Rail Fastening Clip

Category： Track accessories
Application: clip for fastening system
Material: spring steel
Clamping force: 8~20KN
Production process: hot forging
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Railway Elastic Strip/ Fastening Clip/Rail Fastening Clip

1. Brief introduction：

Railway fastener Clips are core components of rail fastening systems, used to securely clamp rails to sleepers (ties), stabilize rail position, absorb train operation vibration and impact, and maintain track gauge accuracy. They play a crucial role in ensuring railway safety, reducing track wear and extending component service life.

Common types of railway Clip include E-type, W-type, and Ω-type Clips, each designed to meet different railway track standards and usage scenarios. E-type Clips are widely applied in ordinary railway and urban rail transit due to their simple structure and reliable clamping force; W-type Clips feature strong elasticity and excellent shock absorption, suitable for high-speed railways and heavy-haul railway lines; Ω-type Clips are favored for their stable performance and easy installation, commonly used in ballastless track systems.

Our railway fastener Clips are made of high-quality alloy steel, by precision forging and heat treatment, ensuring excellent fatigue resistance, corrosion resistance and mechanical strength. They are strictly manufactured in accordance with international and national railway standards, perfectly matching various rail models and fastening system requirements, providing reliable support for efficient and safe railway operation.

2. Technical parameters of rail clip:

Category	Item	Requirement
Material & Heat Treatment	Material	Spring steel (60Si2CrA, 55SiMn, 38Si7), compliant with GB/T 1222, EN 10089
	Hardness	42–47 HRC (General type); 44–48 HRC (Type E clip)
	Metallographic Structure	Sorbitic structure, no overheating/overburning, non-metallic inclusions ≤ Grade K3
	Clamping Force	Type Ⅰ/Ⅱ ≥8 kN; WJ-7/WJ-8 (W1≥10 kN, X2≥8 kN); Type Ⅳ ≥20 kN
	Fatigue Performance	No fracture after ≥5 million cycles, gauge expansion ≤6 mm
	Residual Deformation	Residual deformation ≤0.3 mm after loading & unloading, elastic recovery rate ≥95%
Geometric Accuracy	Dimensional Tolerance	Key parts (foot, arc) ±0.2 mm; Angle tolerance ±0.5°
	Surface Quality	No cracks, folds, burrs; Surface roughness Ra ≤12.5 μm
Special Requirements (HSR/Heavy-Haul)	Insulation Performance	Insulation resistance ≥10⁸ Ω (for ballastless track)
	Anti-corrosion Performance	Hot-dip galvanized coating thickness ≥85 μm; No red rust after ≥96 h neutral salt spray test
Standards	Chinese standard	TB/T 3395 series, TB/T 1495-2020, Type Ⅵ/Ⅶ Clips (2026.05.01 implementation)
	European Standards	EN 13481 series, EN 13146 series
	American Standards	AREMA Standards, ASCE 60
	German Standards	DBS 918 127, DIN 17221
	UIC Standards	Universal international railway standards

3. Corrosion Protection Methods for Rail Clips:

Corrosion protection method	Zinc/Total coating thickness(um)	Neutral Salt Spray Test (h)	Applicable Environment	Cost level	Application
Hot-dip galvanizing	≥85 (HSR) / ≥65 (Conventional Rail)	≥96	Conventional areas, dry lines	Low	Standard configuration, 100% application
Hot-dip galvanizing+sealing	≥100	≥500	Coastal, humid areas	Medium	Mainstream for HSR, over 80% application
Hot-dip galvanizing+powder coating	≥145 (85+60)	≥1000	High salt spray, heavy-haul ballasted tracks	Medium-high	Heavy-haul railways, cross-sea lines
Mechanical galvanizing	20-80	≥200	High-precision HSR clips	High	Import supporting, special test lines
Chromium-free dacromet	8-30	≥300	Metro tunnels, indoor depots	Medium	Special for urban rail transit, small quantity

4. Production Process of Railway Fastener Elastic Strip (Clip)

The production of railway fastener elastic strips (clips) adopts a standardized hot forging process, focusing on material quality and precision control to meet various railway standards. The core process steps are as follows (simplified for web display):

Raw Material Selection & Inspection: High-quality spring steel bars (e.g., 55Si7, 60Si2MnA) are selected as raw materials, and strict inspection is conducted on their chemical composition and mechanical properties to ensure qualified raw materials.

Shearing: The spring steel bars are cut into fixed-length sections by hydraulic cutting machines according to product specifications.
Heating: The cut steel sections are heated to 950-1050℃ in an intermediate frequency heating furnace for subsequent forming.

Forming: The heated steel sections are forged and stamped into the required elastic strip shape by a press and special molds, ensuring uniform microstructure.
Quenching & Tempering: Quenching (at about 800℃) and tempering (at about 400℃) are performed to improve the strength, elasticity and toughness of the product, meeting the required hardness standard (42-48 HRC).