Are railroad tracks hardened?
Jan 21, 2026
Steel rail is a hot-rolled steel product with a standardized cross-section consisting of the rail head, web, and base, designed to guide wheels, distribute wheel loads, and transfer stresses safely into sleepers and ballast or concrete track slabs. As the primary load-bearing element of railway and industrial track systems, steel rail must maintain dimensional stability and surface integrity under long-term cyclic loading. Whether railroad tracks are "hardened" directly affects wear resistance, fatigue life, and overall service 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 |
Are railroad tracks hardened?
Yes, many modern railroad rails are hardened through controlled heat treatment, but not in the same way as quenched structural steel parts. After hot rolling, rails may undergo head hardening or full-section heat treatment, where the rail head is rapidly cooled to refine the pearlite microstructure, increasing surface hardness and fatigue resistance while maintaining sufficient toughness in the web and base. This process significantly improves resistance to rolling contact fatigue and surface wear, which are critical for high-traffic railway lines and heavy-haul corridors.
Different standards define different hardened rail categories. For example, EN 13674-1 specifies grades such as R260, R320Cr, and R350HT, where "HT" indicates heat-treated rails with higher hardness and strength. In Chinese standards, grades such as U71Mn and U75V may also receive controlled cooling to enhance surface performance. GNEE RAIL supplies both normal rolled and heat-treated rails according to project requirements, ensuring optimal balance between hardness, strength, and toughness.
Typical hardness levels of standard and hardened rails:
| Standard | Grade | Heat Treatment | Hardness (HB) | Typical Application |
|---|---|---|---|---|
| EN 13674-1 | R260 | Normal rolled | 260–300 | Conventional passenger and freight lines |
| EN 13674-1 | R350HT | Head hardened | 350–390 | Heavy haul and high-speed lines |
| GB | U71Mn | Controlled cooling optional | 260–300 | General railway and industrial tracks |
| GB | U75V | Controlled cooling common | 300–340 | Crane rails and high-load tracks |
| AREMA | 900A | Heat treated optional | 300–340 | North American freight corridors |
These hardness levels show that "hardened" rails are specifically engineered to resist surface damage while still preventing brittle fracture under impact loading.
Why Is Hardening More Critical for Some Rail Applications?
Not all tracks experience the same stress conditions. High-speed passenger railways face intense rolling contact fatigue due to frequent wheel passes, while heavy-haul freight lines are exposed to extremely high axle loads that can cause plastic flow of the rail head. In industrial environments, crane rails experience strong vertical impacts and lateral forces during trolley acceleration and braking. In these scenarios, insufficient hardness leads to rapid wear, corrugation, and surface cracking, which shortens rail service life and increases maintenance costs.
Comparison of hardness demand between rail applications:
| Application Type | Typical Rail Standard | Preferred Grade | Hardness Demand |
|---|---|---|---|
| Passenger railway | EN, UIC, GB | R260, U71Mn | Medium |
| Heavy-haul freight | EN, AREMA, GB | R350HT, 900A | High |
| Port crane runway | DIN536, YB/T | U75V | Very high |
| Steel plant transfer lines | DIN536, QU | U71Mn, U75V | High |
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.
