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Rail shoulder is cast in the concrete rail ties to fix the elastic rail clips. There are two types of rail shoulders available: the cast-in shoulder and the weld-on rail shoulder, both of which are used for the fixing of elastic rail clips.
| Reference | Standard GB 1348-88 | Standard GB 1348-88 | Standard GB 1348-89 |
|---|---|---|---|
| Chemical Composition (%) | C: 3.60-3.80 | Si: 2.50-2.90 | C: 3.40-3.90 | Si: 2.70-3.00 | C: 3.50-3.60 | Si: 3.0-3.2 |
| Tensile Strength | ≥500 Mpa | ≥450 Mpa | >400 Mpa |
| Yield Strength | ≥320 Mpa | ≥310 Mpa | ≥250 Mpa |
| Elongation (%) | ≥7 | ≥10 | ≥15 |
| Hardness | 170~230HB | 160-210HB | 130~180HB |
| Organization | Ferrite + Pearlite | Graphite + Ferrite + Pearlite | Ferrite |


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