What is rail steel made of?
Jan 21, 2026
A steel rail is a key structural component of a railway track, designed to provide a durable and stable running surface for train wheels while safely transmitting the load to sleepers and ballast. Steel rails must combine high strength, wear resistance, and toughness to withstand heavy loads, repeated impact, and varying environmental conditions.
What is rail steel made of?
Rail steel is primarily a high-carbon steel with carefully controlled alloying elements that enhance its mechanical properties. The most commonly used grades include U71Mn, U75V, 50Mn, and R260, depending on regional standards and operational requirements. The chemical composition generally includes carbon (C), manganese (Mn), silicon (Si), phosphorus (P), sulfur (S), and occasionally small amounts of vanadium (V) or chromium (Cr) to improve hardness and wear resistance.
| Element | Typical Range (U71Mn) | Function |
|---|---|---|
| C | 0.70–0.80% | Hardness and strength |
| Mn | 1.20–1.60% | Toughness and wear resistance |
| Si | 0.15–0.35% | Deoxidation, elasticity |
| P | ≤0.035% | Prevents brittleness |
| S | ≤0.035% | Reduces crack susceptibility |
| V | 0.05–0.10% (optional) | Grain refinement, wear resistance |
Common Rail Steel Grades Worldwide:
| Grade | Standard / Region | Typical Composition (wt%) |
| R260 | EN 13674-1 (Europe) | C: 0.67–0.80, Mn: 0.90–1.20, Si: ≤0.50 |
| R350HT | EN 13674-1 (Europe) | C: 0.75–0.85, Mn: 0.80–1.20, Cr: 0.20–0.50 |
| Grade 260 | AREMA (North America) | C: ~0.77, Mn: ~1.0–1.2, Si: ~0.2 |
| 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) |
| 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) |
| U71Mn | GB/T 2585 (China) | C: 0.65–0.77, Mn: 1.10–1.40, Si: 0.15–0.35 |
| U75V | GB/T 2585 (China) | C: 0.67–0.77, Mn: 0.70–1.00, V: 0.04–0.12 |
Detailed Steel Grades and Mechanical Properties：
| Steel Grade | C (%) | Si | Mn | Cr | V | P | S | Tensile Strength (Rm/MPa) |
|---|---|---|---|---|---|---|---|---|
| U71Mn | 0.65–0.76 | 0.15–0.58 | 0.70–1.40 | – | – | ≤0.035 | ≤0.030 | ≥880 |
| U75V | 0.71–0.80 | 0.50–0.80 | 0.75–1.05 | – | 0.04–0.12 | ≤0.035 | ≤0.030 | ≥980 |
| U78CrV | 0.72–0.82 | 0.50–0.80 | 0.70–1.05 | 0.30–0.50 | 0.04–0.12 | ≤0.035 | ≤0.030 | ≥1080 |
| U77MnCr | 0.72–0.82 | 0.10–0.50 | 0.80–1.10 | 0.25–0.40 | – | ≤0.035 | ≤0.025 | ≥980 |
| U76CrRE | 0.71–0.81 | 0.50–0.80 | 0.80–1.10 | 0.25–0.35 | 0.04–0.08 | ≤0.035 | ≤0.025 | ≥1080 |
Do rails of different standards use the same materials?
No, rails of different standards don't always use the exact same materials; they use different grades and compositions of steel (like carbon-manganese, alloy, head-hardened), specified by standards (AREMA, UIC, EN) to meet specific needs for strength, wear, hardness, and weldability, resulting in variations in elements like carbon, manganese, and phosphorus to suit different climates and traffic, though some high-quality steels overlap.
Key Differences & Examples:
Material Focus:
- Foreign Standards (AREMA, BS, UIC): Often focus on enhanced low-temperature toughness, corrosion resistance, and adaptability to specific climates, using more flexible alloy compositions.
- National Standards (like China's GB): May optimize for fatigue resistance, weldability, and cost, using U-series heat-treated steels.
Specific Elements:
- Manganese (Mn): High manganese steel is common for work-hardening properties, but levels vary.
- Carbon (C): Crucial for strength, with varying amounts across standards.
- Phosphorus (P) & Sulfur (S): Kept low as impurities to prevent brittleness, with limits differing by standard (e.g., ASTM limits P to 0.04%).
- Grades: Standards define specific grades (e.g., UIC 900A, AREMA 700/900, GB U75V) that correlate to tensile strength and hardness, not just raw material.
- Heat Treatment: Different standards specify varying heat treatments (like head hardening) to achieve desired properties, impacting the final material performance.
As a professional rail fastener supplier, GNEE RAIL can provide different standard steel rail such as GB,American, BS, UIC, DIN, JIS, Australian and South Africa which used in railway lines, cranes and coal mining.
| 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 |
