What are the properties of rail steel?
Jan 21, 2026
Steel rail is the principal load-bearing element of railway tracks, designed to guide train wheels, transmit axle loads to the sleepers and ballast, and maintain long-term alignment and stability under repeated dynamic stress. Unlike ordinary structural steel, rail steel is engineered for a combination of high hardness, wear resistance, toughness, and fatigue strength. GNEE RAIL offers a comprehensive range of rail steels and associated fastening systems, including elastic clips, rail pads, base plates, and customized machining services to suit railway, mining, port, and crane rail applications.
Materials of Steel Rails
Rail steel must satisfy a delicate balance between hardness and toughness. The head of the rail must resist rolling contact fatigue and surface wear, the web transmits bending and shear stresses, and the base distributes loads to the sleepers. Modern rail steels are usually carbon-manganese steels, such as U71Mn (commonly used in China), R260, R350HT (Europe), and 900A/1100 (industrial applications). Typical mechanical properties include high tensile strength, yield strength, and adequate elongation to prevent brittle fracture.
The table below summarizes common rail steel grades, their chemical composition, and mechanical properties:
| Grade | Standard / Region | Typical Composition (wt%) | Key Features & Applications |
| R260 | EN 13674-1 (Europe) | C: 0.67–0.80, Mn: 0.90–1.20, Si: ≤0.50 | Base-grade rail; cold-rolled; widely used on medium-traffic lines. Good weldability and cost efficiency. |
| R350HT | EN 13674-1 (Europe) | C: 0.75–0.85, Mn: 0.80–1.20, Cr: 0.20–0.50 | Heat-treated (online/offline); UTS ≥1100 MPa; 30–50% longer life than R260. Standard for high-speed (TGV, ICE) and heavy-haul lines. |
| Grade 260 | AREMA (North America) | C: ~0.77, Mn: ~1.0–1.2, Si: ~0.2 | Equivalent to R260; used with rail sections like 115RE, 136RE. Common on Class I freight networks. |
| Grade 350 | AREMA + Mill Specs (USA/Canada) | C: 0.78–0.83, Mn: 0.90–1.20, Cr: 0.2–0.6, + V/Nb (microalloyed) | TMCP or heat-treated; UTS ~1180–1280 MPa. For demanding curves, heavy axle loads (>33 ton), and high-tonnage corridors. |
| BH Rail (Bainitic) | JIS E 1101 (Japan), adopted in EU/India | C: 0.65–0.80, Mn: 1.0–1.4, Cr/Mo/Ni (optional, mill-specific) | Bainitic microstructure; high strength (UTS ~1250–1350 MPa) + superior fracture toughness. Used on Shinkansen curves and high-wear segments. |
| U71Mn | GB/T 2585 (China) | C: 0.65–0.77, Mn: 1.10–1.40, Si: 0.15–0.35 | Work-hardening carbon-manganese rail; standard for 50kg/m, 60kg/m rails on Chinese mainlines. Comparable to R260/R350 in performance. |
| U75V | GB/T 2585 (China) | C: 0.67–0.77, Mn: 0.70–1.00, V: 0.04–0.12 | Vanadium-microalloyed; higher strength & fatigue resistance than U71Mn. For high-speed (e.g., Beijing–Shanghai HSR) and heavy-haul lines. |
Why Are These Properties Critical?
- Hardness and Wear Resistance: The rail head must withstand repeated rolling contact, resist indentation, and limit surface wear. Higher hardness extends service life but must be balanced to avoid brittleness.
- Toughness and Fatigue Resistance: Rails are subjected to millions of load cycles. Adequate toughness ensures resistance to cracks and fractures, particularly at welds, bolted joints, or tight curves.
- Elasticity and Yield Strength: Rails must flex slightly under wheel loads to prevent permanent deformation but return to their original profile to maintain proper track geometry.
- Corrosion Resistance: While rails are mostly carbon-manganese steel, surface treatments such as oxide blackening, galvanizing, or Dacromet coatings can reduce rust formation, especially in humid or coastal environments.
GNEE RAIL provides rails across multiple international standards (GB, UIC, EN, AREMA/ASCE, DIN536, JIS, AS) and offers technical support for selecting the optimal steel grade, profile, and heat treatment for specific axle loads, traffic densities, and operational environments. Beyond steel supply, GNEE RAIL also delivers fastening systems, installation guidance, and post-installation monitoring services, ensuring that each rail system performs reliably throughout its intended service life.
| Standard | Sepc. | Material Typical Grade |
| UIC860 | UIC54 | 700,900A,900B |
| UIC60 | ||
| EN13674.1 | 5.00E+02 | R200,R350HT,R260Mn,R35LHT,R320Cr,R370CrHT |
| 5.40E+02 | ||
| 6.00E+02 | ||
| 6.00E+03 | ||
| BS-11-1985 | BS80A | 700,900A,900B |
| BS90A | ||
| BS100A | ||
| AREMA | 115RE | SS,HH,LA,IH |
| 136RE | ||
| ASCE60 | U71Mn | |
| ASCE85 | U71Mn | |
| GB 2585-2007 | 50kg/m | U71Mn |
| 60kg/m | U75V | |
| 75kg/m | ||
| TB/T2344-2012 | 50kg/m | U71Mn,U75V,U77MnCr |
| 60kg/m | U78CrV | |
| 75kg/m | ||
| GB 11264-1989 | 8kg/m | Q235 |
| 12kg/m | Q235 | |
| 15kg/m | 55Q, Q235 | |
| 18kg/m | 55Q, Q235 | |
| 22kg/m | 55Q, Q235 | |
| 24kg/m | 55Q, Q235 | |
| 30kg/m | 55Q, Q235 | |
| 38kg/m | 50Mn, U71Mn | |
| 43kg/m | 50Mn, U71Mn | |
| GB Crane rails | QU70 | U71Mn |
| QU80 | U71Mn | |
| QU100 | U71Mn | |
| QU120 | U71Mn |
