What Are the Raw Materials for E Type Rail Elastic Clip?
The selection of raw materials for E-type rail elastic clips is the cornerstone of their exceptional performance, primarily utilizing a series of high-performance spring steels.
| Item | Railway E clip | |||
| Chemical Composition | 60Si2MnA | 60Si2CrA | 55Si2Mn | 38Si7 |
| C:0.56-0.64, Mn:060-0.90, Si:1.50-2.00, Cr:≤0.35, P:≤0.03, S:≤0.03 | C:0.56-0.64, Mn:0.40-0.70, Si:1.40-1.80, | C:0.52-0.60, Mn:0.60-0.90, Si:1.50-2.00, | C:0.35-0.42, Mn:0.50-0.80, Si:1.50-1.80, P:≤0.03, S:≤0.03 | |
| Cr:0.70-1.00 P:≤0.03, | Cr:≤0.35 | |||
| S:≤0.03 | P:≤0.03, S:≤0.03 | |||
| Hardness | 44-48 HRC | |||
| Fatigue Life | 3-5 million cycles without breaking | |||
| Surface | Plain Oiled, Oxygen Black, Zinc Plated, Hot Dip Galvanized, Dacro coating, Color Painting | |||
| Standard | UIC, AREMA, BS, RDSO, DIN, JIS, ISCR, VALEC, GOSTR- EASC, GB/T or other upon requirements | |||
Among these, 60Si2MnA is the most commonly used material, with its chemical composition precisely proportioned: carbon content of 0.56%-0.64% provides fundamental strength, silicon content of 1.60%-2.00% significantly enhances the elastic limit, manganese content of 0.60%-0.90% improves toughness and hardenability, while strictly controlling harmful elements like phosphorus and sulfur to no more than 0.03%. This composition design enables the material to achieve ideal comprehensive mechanical properties after heat treatment.
60Si2CrA is another premium option, adding 0.70%-1.00% chromium based on 60Si2MnA. The addition of chromium significantly improves the steel's temper resistance and hardenability, allowing the clip to maintain stable performance even in extreme temperature environments.
For application scenarios requiring higher toughness, 55Si2Mn adjusts the carbon content to 0.52%-0.60%, providing better plasticity reserve while maintaining sufficient strength.
Meanwhile, 38Si7, as a medium-carbon silicon-manganese steel, controls its carbon content at 0.35%-0.42% and silicon content at 1.50%-1.80%, making it particularly suitable for manufacturing clip products with high formability requirements.
These spring steel materials must undergo strict heat treatment processes to meet usage requirements. Through precise control of quenching and tempering, the material forms a tempered troostite microstructure, ultimately stabilizing the hardness within the 44-48 HRC range. The surface treatment stage typically employs hot-dip galvanizing technology, forming an alloy coating with a thickness no less than 80μm in a 450°C zinc bath, effectively enhancing corrosion resistance.
GNEE RAIL implements strict quality control starting from raw material, requiring every batch of steel to pass spectroscopic analysis and mechanical property testing, ensuring reliable quality assurance from the very source.
