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Grai Orthopedic Implants
Grai Orthopedic Implants
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 shoulder, both of which are used for the fixing of elastic rail clips. The casting shoulders as the embedded part of the rail way fastening system are pressed in concrete sleeper and work together with the E clip to fasten the rail. The cast in shoulder is made by casting from iron, such as, GB/T 1348-1988, NF EN 1563(1997), ISO1038, DIN 1693, JIS G5502 (2001), KS D 4302, GOST 7293(1985) or BS EN 1563(1997).
| Application | UIC54 | UIC60 | 115RE, 50kg, 60kg, BS80lbs, BS100lbs |
|---|---|---|---|
| Name | QT500-7 | QT450-10 | QT400-15 |
| Standard | GB 1348-88 | GB 1348-88 | GB 1348-89 |
| Chemical (%) | 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 |
| Hardness | 170~230HB | 160~210HB | 130~180HB |
The Rail shoulder is semi-embedded part cast in the concrete rail ties to fix the elastic rail clip to the base plate. There are two common types of rail shoulders: Cast-in Shoulder and Weld-on Shoulder. One is Single Stem Iron Shoulder used in pre-stressed concrete ties and the other is Twin Stem Iron Shoulder used in Bi-Block or Twin Block concrete ties.
The casting shoulders are pressed in concrete sleeper and work together with the E clip to fasten the rail. Made by casting from iron under standards like ISO1038, DIN 1693, and BS EN 1563.
| Material | Tensile Strength(Mpa) | Yield Strength(Mpa) | Elongation(%) |
| QT400-15(GGG40) | 400 | 250 | 15 |
| QT450-10(GGG45) | 450 | 310 | 10 |
| QT500-7 (GGG50) | 500 | 320 | 7 |
The weld-on shoulder is used at typical positions where the rail shoulder is welded on flat steel plate rather than the standard tie plate. Fabricated via hot forging according to AREA standards. The steel material can be low or medium carbon steel.
