Raw material Plain Surface Steel Tie Plate For Fixing Rail Fasteners
Material: carbon steel
1.QT500-7
2.QT450-10
3.QT400-15
3.QT400-15
4. low carbon steel or high carbon steel by forged
5. Low carbon steel S275JR, Q235,etc. by rolled
Production Process
1. Raw material
2. forging or casting (1100 degrees celsius)
3. Forming
4. Hardening
5. Tempering below 350 degrees celsius
6. Inspection
7. Packing
Surface Treatment
1. Plain (oiled) (main)
2. Color paint
3. Oxide Black
4. Galavazing
5. DHG
Application system
1. KPO Rail fatsening
2. SKL3 Rail fatsening
3. SKL12 Rail fatsening
4. Other
| Name | QT500-7 | QT450-10 | QT400-15 |
| Standard | GB 1348-88 | GB 1348-88 | GB 1348-89 |
| Chemical composition(%) | C:3.60-3.80 | C:3.40-3.90 | C:3.50-3.60 |
| Mn:≤0.6 | Mn:0.2-0.5 | Mn:≤0.5 | |
| Si:2.50-2.90 | Si:2.70-3.00 | Si:3.0-3.2 | |
| P:≤0.08 | P:≤0.07 | P:≤0.07 | |
| S:≤0.025 | S:≤0.03 | S:≤0.02 | |
| Tensile Strength | ≥500 Mpa | ≥450 Mpa | ≥400 Mpa |
| Yield Strength | ≥320 Mpa | ≥310 Mpa | ≥250 Mpa |
| Elongation(%) | ≥7 | ≥10 | ≥15 |
| Hardnrss | 170~230HB | 160~210HB | 130~180HB |
| Metallographic organization | ferrite + pearlite | graphite + ferrite + pearlite | ferrite |
| Surface | plain (oiled) | ||
