What type of steel is rail?
Jan 21, 2026
Steel rail is the backbone of railway and industrial track systems, engineered to guide wheels, distribute heavy loads, and maintain a continuous, smooth rolling surface. Unlike ordinary steel, rail steel is designed with precise metallurgical composition and mechanical properties to resist wear, fatigue, and high dynamic stresses. GNEE RAIL provides a wide range of steel rails for heavy-duty industrial cranes, railway systems, and mining operations, including DIN536 crane rails, QU crane rails, heavy rails, light rails, and flat bar rails.
What type of steel is rail?
Rail steel is primarily high-carbon steel, sometimes with alloying elements like manganese, chromium, or vanadium to enhance hardness, wear resistance, and toughness. Common grades include U71Mn, U75V, 50Mn, R260, and R350HT. For heavy-duty crane rails, GNEE RAIL often uses U71Mn or 50Mn, which provides high vertical load support and excellent fatigue resistance. Heat-treated rails further improve surface hardness and extend service life, especially under high-frequency and high-load conditions.
The chemical composition of typical Chinese standard rails is shown below:
| Grade | C (%) | Si (%) | Mn (%) | P max (%) | S max (%) | V (%) |
|---|---|---|---|---|---|---|
| Q235B | 0.12-0.20 | ≤0.3 | 0.3-0.7 | 0.045 | 0.045 | - |
| 55Q | 0.50-0.60 | 0.15-0.35 | 0.60-0.90 | 0.045 | 0.045 | - |
| U71Mn | 0.65-0.76 | 0.15-0.35 | 1.10-1.40 | 0.040 | 0.040 | - |
| U75V | 0.71-0.80 | 0.50-0.80 | 0.70-1.05 | 0.030 | 0.030 | 0.04-0.12 |
| 50Mn | 0.48-0.56 | 0.17-0.37 | 0.70-1.00 | 0.035 | 0.035 | - |
What are the standard sizes and specifications of steel rails?
Steel rails come in a wide variety of dimensions and weights, suited for different applications such as mainline railways, mining tracks, or crane runways. GNEE RAIL stocks a complete range of rail models according to Chinese (GB/YB), DIN, UIC, BS, ASCE, and JIS standards. For example, our crane rails include:
| Standard | Sepc. | Material Typical Grade |
|---|---|---|
| UIC860 | UIC54 | 700,900A,900B |
| UIC60 | ||
| EN13674.1 | 50E1 | R200,R350HT,R260Mn,R35LHT,R320Cr,R370CrHT |
| 54E1 | ||
| 60E1 | ||
| 60E2 | ||
| 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 U75V |
| 60kg/m | ||
| 75kg/m | ||
| TB/T2344-2012 | 50kg/m | U71Mn,U75V,U77MnCr U78CrV |
| 60kg/m | ||
| 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 |
How do different steel grades affect rail performance?
The steel grade determines wear resistance, toughness, and fatigue life. For example, U71Mn rails are optimized for heavy-load cranes and port applications due to their excellent vertical load capacity. In contrast, 50Mn rails are often used for medium-duty crane tracks, offering a balance of hardness and toughness. Heat-treated rails, such as U75V, achieve higher surface hardness (320–380 HB) and tensile strength (≥1180 MPa), ensuring longer service life in high-stress environments.
| Material | Tensile Strength (MPa) | Hardness (HB) | Application |
|---|---|---|---|
| U71Mn | ≥880 | 240–270 | Heavy-duty crane rails, ports |
| U75V | ≥980 | 280–320 | High-load industrial rails |
| 50Mn | ≥645 | 197 | Medium-duty crane and mining rails |
| R350HT | ≥1175 | 350–390 | High-speed railway rails |
GNEE RAIL provides not only a full catalog of rail types and sizes but also customized solutions, technical support for installation, and global shipping for railway, mining, and crane applications. Our clients rely on us for precision, durability, and compliance with international standards.
