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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 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. |
| Name | 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 |
| 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 |
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: 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.
| 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 |
| Material | C | Si | Mn | P | S |
| QT400-15 | 3.6-3.6 | 3.0-3.2 | 0.5 | 0.07 | 0.02 |
| QT450-10 | 3.4-3.9 | 3.7-3.0 | 0.5 | 0.07 | 0.03 |
| QT500-7 | 3.4-3.8 | 2.5-2.9 | 0.6 | 0.08 | 0.025 |
The weld-on shoulder is used at typical rail positions where the shoulder is welded onto a flat steel plate rather than a standard tie plate. The production method is hot forging, fabricated according to AREA standards. Material types 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, particularly useful for switch and crossing layouts where vertical rail geometry is employed. Its ability to be welded in specific positions makes it cost-effective for layout designs.
