What is the hardness of railroad rail?
Jan 21, 2026
What Is Steel Rail and Its Role in Railways?
Steel rail, also called railroad rail or crane rail, is the fundamental component of railway track systems, guiding the wheels of locomotives and industrial vehicles while transmitting heavy loads to sleepers and the underlying foundation. Designed with an I-shaped cross-section consisting of a rail head, web, and base, steel rails provide maximum bending resistance and long-term stability. At GNEE RAIL, we offer a wide range of steel rail types, including light rails, heavy rails, and crane rails, all engineered to meet international standards and industrial requirements. In addition, GNEE RAIL provides customized solutions, installation guidance, and after-sales support for optimal rail performance.
What is the hardness of railroad rail?
Rail hardness is a critical factor that influences wear resistance, durability, and operational life. The hardness of a rail depends primarily on the steel grade and heat treatment used during manufacturing. For heavy rails, such as those used in industrial cranes or main railway lines, higher hardness ensures reduced wear under high axle loads, whereas lower hardness in light rails allows for better ductility in lighter transport applications. GNEE RAIL supplies rails across multiple hardness ranges to suit different applications, including U71Mn for heavy haul and QU crane rails.
| Steel Rail Grade | Brinell Hardness (HB) | Typical Application |
|---|---|---|
| Q235 | – | Light rail, low-load tracks |
| 50Mn | ~197 | Medium-heavy industrial lines |
| 55Q | ≥197 | Mining and factory light rails |
| U71Mn | 240–270 | Heavy haul railways, crane rails |
| U75V | 240–270 | High-speed rail, heavy-load lines |
| R260 | 260–300 | UIC standard mainline rails |
| R350HT | 350–390 | Heavy-haul, high wear railway sections |
| ASSZ-1 | ≥275 | Severe wear, high-impact crane rails |
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 |
What Steel Grades and Specifications Are Available from GNEE RAIL?
Selecting the right rail depends on load requirements, operating speed, and application environment. GNEE RAIL provides a full portfolio of rails compliant with Chinese GB, UIC, DIN, JIS, and AREMA standards. Heavy rails for freight lines typically use U71Mn or U75V with weights from 38kg/m to 75kg/m, while crane rails such as QU70 to QU120 are optimized for industrial lifting equipment. Light rails for urban transit or mine tracks are offered in 15kg/m, 22kg/m, and 30kg/m with Q235 or 55Q steel grades.
| Rail Type | Standard | Material | Weight Range (kg/m) | Typical Use |
|---|---|---|---|---|
| Heavy Rail | GB2585-2007 | U71Mn | 38–75 | Mainline, freight, steel plants |
| QU Crane Rail | YB/T5055-2014 | U71Mn | QU70–QU120 | Overhead cranes, gantry cranes |
| Light Rail | GB/T11264-1989 | Q235/55Q | 15kg,22kg,30kg | Urban rail, mine branch lines |
| DIN536 Crane Rail | DIN536 | U71Mn/50Mn | A45–A120 | Industrial crane tracks |
How Does Rail Hardness Affect Industrial Crane Rails?
Crane rails endure concentrated vertical loads from heavy trolleys, requiring a balance between hardness and toughness. Too low a hardness leads to rapid wear, while too high a hardness increases brittleness.
| Classification | Height(mm) | Head (mm) | Bottom (mm) | Thick(mm) | Weight (kg/m) | |
| Crane Rail | QU 70 | 120 | 70 | 120 | 28 | 52.8 |
| QU 80 | 130 | 80 | 130 | 32 | 63.69 | |
| QU 100 | 150 | 100 | 150 | 38 | 88.96 | |
| QU 120 | 170 | 120 | 170 | 44 | 118.1 | |
GNEE RAIL's QU crane rails and DIN536 rails are manufactured from U71Mn or 50Mn steel, achieving Brinell hardness of 240–270 HB to maximize wear resistance without compromising safety. This ensures long-term stability for industrial applications such as steel mills, port terminals, and automated warehouses.
Since 2008, GNEE RAIL has been supplying steel rails of different grades for more than 18 years, steel rails from GNEE is highly recommened in China and abroad.Wtih cutting edge equipment, GNEE produces high quality steel rails that meet with requirements of most countries. Standard rail, head hardened rail, heavy rail,light rail,crane rail and other types are all available here, as one of the China main rail supplier, GNEE RAIL has been working on supplying economical green railway products all over the world.
