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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 rail, 60kg rail, BS80lbs, BS100lbs, etc. |
| Material Grade | QT500-7 | QT450-10 | QT400-15 |
| Standard | GB 1348-88 | GB 1348-88 | GB 1348-89 |
| Chemical composition(%) | C:3.60-3.80 Mn:0.2-0.5 Si:2.50-2.90 P:≤0.08 S:≤0.025 |
C:3.40-3.90 Mn:≤0.5 Si:2.70-3.00 P:≤0.07 S:≤0.03 |
C:3.50-3.60 Mn:≤0.5 Si:3.0-3.2 P:≤0.07 S:≤0.02 |
The Rail shoulder is a 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 available: Cast-in Shoulder and Weld-on Shoulder. One is the Single Stem Iron Shoulder used in pre-stressed concrete ties, and the other is the Twin Stem Iron Shoulder used in Bi-Block or Twin Block concrete ties.
The casting shoulders are pressed into concrete sleepers and work together with the E-clip to fasten the rail. They are manufactured according to international casting standards such as ISO1038, DIN 1693, and JIS G5502.
Cast-in Rail Shoulder Mechanical Property:
| 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 rail positions where the shoulder is welded onto flat steel plates rather than standard tie plates. The production method is hot forging, fabricated according to AREA standards. The steel material can be low or medium carbon steel based on specific requirements.
Rail cast iron shoulders can be welded onto longer length steel sleeper sections or bearers, making them particularly cost-effective for switch and crossing layouts where vertical rail geometry is employed.
