DIN S18 Light Rail vs GB 18KG Light Rail
While the European DIN S18 light rail (DIN 5901) and the Chinese GB 18KG light rail (GB/T 11264-2012) share almost identical linear masses, they are rolled to completely different geometric profiles and structural tolerances.
Understanding these differences is critical for engineering compatibility, wheel flange tracking, and structural calculation alignment.
Dimensional Profile Differences (The Structural Shape)
Although both sit in the 18 kg/m weight class, the DIN S18 has a taller, more slender profile, whereas the GB 18KG is shorter and wider at the head.
- Rail Height (H): The DIN S18 is 93.0 mm tall, while the GB 18KG is 90.0 mm tall. The extra 3mm height of the S18 provides a slightly higher section modulus, increasing its vertical bending resistance across spaced sleepers.
- Base Width (B): The DIN S18 features a wider base of 82.0 mm, compared to the GB 18KG's 80.0 mm base. This gives the S18 a broader footprint for load distribution onto rail pads or ties.
- Head Width (C): The GB 18KG has a wider head running surface at 40.0 mm, compared to the DIN S18 at 43.0 mm.
- Web Thickness (t): Both profiles maintain a robust 10.0 mm web thickness, providing excellent shear resistance.
GB Light Rail:
| Classification | Height(mm) | Head (mm) | Bottom (mm) | Thick(mm) | Weight (kg/m) | |
| Light Rail | 8 KG/M | 65 | 25 | 54 | 7 | 8.42 |
| 9 KG/M | 63.5 | 32.1 | 63.5 | 5.9 | 8.94 | |
| 12 KG/M | 69.85 | 38.1 | 69.85 | 7.54 | 12.2 | |
| 15 KG/M | 79.37 | 42.86 | 79.37 | 8.33 | 15.2 | |
| 18 KG/M | 80 | 40 | 80 | 10 | 18.06 | |
| 22 KG/M | 93.66 | 50.8 | 93.66 | 10.72 | 22.3 | |
| 24 KG/M | 107 | 51 | 90 | 10.9 | 24.46 | |
| 30 KG/M | 107.95 | 60.33 | 107.95 | 12.3 | 30.1 | |
DIN Light Rail:
|
Type of Rail |
Height (mm) | Base width (mm) | Head width (mm) | Web (mm) | Weight (kg/m) | |
|
S10 |
70 | 58 | 32 | 6 | 10 | |
|
S14 |
80 | 70 | 38 | 9 | 14 | |
|
S18 |
93 | 82 | 43 | 10 |
18.3 |
|
| S20 | 100 | 82 | 44 | 10 |
19.8 |
|
| S24 | 115 | 90 | 53 | 10 |
24.4 |
|
| S30 | 108 | 108 | 60.3 | 12.3 |
30.03 |
Standard Material Grade Mapping
The standard steel grades specified for these rails dictate their mechanical performance thresholds.
- DIN S18 Official Grades: Primarily produced in R200 (Hardness ≥ 200 HBW, Tensile Strength ≥ 685 MPa) and R260 (≥ 260 HBW, ≥ 880 MPa).
| EN 13674-4: R200 Steel Grade Specifications | ||
| Property Category | Parameter / Element | Value / Requirement (EN 13674-4) |
| Chemical Composition (%) | Carbon (C) | 0.40 – 0.60 |
| Manganese (Mn) | 0.60 – 1.20 | |
| Silicon (Si) | 0.15 – 0.40 | |
| Phosphorus (P) | ≤ 0.035 | |
| Sulfur (S) | ≤ 0.035 | |
| Mechanical Properties | Tensile Strength (Rm) | ≥ 680 MPa |
| Elongation (A) | ≥ 14% | |
| Running Surface Hardness | ≥ 200 HBW | |
| EN 13674-4: R260 Steel Grade Specifications | ||
| Chemical Composition (%) | Carbon (C) | 0.62 – 0.80 |
| Manganese (Mn) | 0.70 – 1.20 | |
| Silicon (Si) | 0.15 – 0.58 | |
| Phosphorus (P) | ≤ 0.025 | |
| Sulfur (S) | ≤ 0.025 | |
| Chromium (Cr) | ≤ 0.15 | |
| Mechanical Properties | Tensile Strength (Rm | ≥ 880 MPa |
| Elongation (A) | ≥ 10% | |
| Running Surface Hardness | 260 – 300HBW | |
- GB 18KG Official Grades: Typically rolled in Q235B (≥ 375 MPa) for low-end setups, or 55Q (,≥ 685 MPa) for standard wear resistance.
| Q235B | Mechanical property | Chemical composition(%) | |||||||||
| Yield strength | Tensile strength | Elongation | Hardness | C | Si | Mn | S | P | |||
| MPa | kg/mm² | MPa | kg/mm² | min | HB | ≤ | ≤ | ≤ | |||
| ≥ | ≥ | ||||||||||
| 235 | 24 | 375-460 | 38-47 | 26% | 0.12-0.22 | 0.35 | 0.30-0.70 | 0.045 | 0.045 | ||
| 55Q | Mechanical property | Chemical composition(%) | |||||||||
| Yield strength | Tensile strength | Elongation | Hardness | C | Si | Mn | S | P | |||
| MPa | kg/mm² | MPa | kg/mm² | min | HBW | ≤ | ≤ | ||||
| ≥ | ≥ | ≥ | ≥ | ≥ | |||||||
| 685 | 69 | 197 | 0.50-0.60 | 0.15-0.35 | 0.60-0.90 | 0.04 | 0.04 | ||||
Cross-Standard Equivalency:
- DIN R200 maps directly to GB 55Q in terms of tensile properties and hardness.
- DIN R260 maps directly to GB U71Mn (high-carbon manganese steel), which is the standard choice for high-cycle ASRS systems due to its ≥ 260 HBW rating.
Application Selection Rule
- Choose DIN S18 when: The procurement specification originates from European machinery suppliers, automated warehouse designers (ASRS projects), or global engineering firms requiring strict DIN 5901 geometric tracking compliance.
- Choose GB 18KG when: Building regional mining tracks, standard factory floor loops, and cost-optimized transfer lines where local Chinese standard rolling stock and matching fastening hardware are readily accessible.
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FAQ
- Are the fishplates for European S18 rails interchangeable with Chinese GB 18KG rails?
No, because the DIN S18 has a total height of 93.00 mm and a 43.00 mm head, its joint profile shape differs significantly from the 90.00 mm height of the GB 18KG rail. Using mismatched splice bars creates vertical alignment lips at the joints, causing severe wheel impact shocks that accelerate track head cracking.
- How does the geometric difference between these profiles alter foundation clip selection?
The DIN S18 features an 82.00 mm base width, whereas the GB 18KG profile has an 86.00 mm base flange. This 4 mm deviation means standard rigid rail clips or elastic fasteners designed for the Chinese rail will fail to clamp the European track securely, resulting in dangerous track creeping and gauge widening under load.
- Which rail profile demonstrates higher resistance to vertical crushing during overhead crane applications?
While both profiles maintain an identical 10.00 mm web thickness, the DIN S18 rail offers better overall resistance to crushing and buckling under high vertical gantry loads. Its higher 680–880 MPa tensile steel matrix provides greater structural rigidity, preventing web distortion when heavy crane assemblies pass overhead.
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