What steel is used for rail tracks?
Jan 21, 2026
Why rails are not made from ordinary structural steel
Steel rail is a high-strength structural component with a head, web and base, produced with precise dimensional tolerances and metallurgical control. Under repeated dynamic loading the rail must resist wear, fatigue and deformation, which ordinary structural steels cannot deliver: the running surface would wear quickly and the head would flow plastically under concentrated wheel contact. Rail steels are therefore high-carbon, low-alloy steels with controlled levels of carbon and manganese, sometimes with vanadium or chromium, and they are produced under dedicated rail standards rather than general structural steel standards.
Common rail steel grades and their properties
| Steel grade | Standard | Typical rail types | Mechanical properties | Application |
|---|---|---|---|---|
| U71Mn | GB/T 2585, TB/T 2344 | 50/60 kg/m heavy rail, QU crane rail | Tensile ≥ 880 MPa, hardness 240–270 HB | Mainline railways, heavy industrial cranes |
| U75V | GB/T 2585, TB/T 2344 | High-speed and heavy rail | Tensile ≥ 980 MPa, hardness 300–340 HB | High-speed passenger and freight lines |
| 50Mn | GB, DIN 536 profiles | DIN 536 crane rail | Per mill specification | Gantry cranes, steel mills, ports |
| R260 | EN 13674-1 | Mainline rail, 46 kg/m and above | Tensile ≥ 880 MPa, hardness 260–300 HB | Conventional and urban lines |
| R350HT | EN 13674-1 | High-strength heavy rail | Tensile ≥ 1175 MPa, hardness 350–390 HB | Heavy-haul freight and high-speed lines |
| 55Q | GB 11264 | Light and medium rail | Tensile ≥ 685 MPa | Regional railways, branch lines, mining |
Note that rail steels are specified by rail standards, not by the structural tubing standard GB/T 8162: U71Mn and U75V rails are produced to GB/T 2585 (heavy rail) and TB/T 2344 (rail for mainline use), while light rails follow GB 11264. The correct standard must be written into the purchasing specification.
Chemical composition of international rail steels
| 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 microalloy |
| Bainitic rail | JIS E 1101 (Japan), adopted in EU/India | C 0.65–0.80, Mn 1.0–1.4, Cr/Mo/Ni optional |
| 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 |
Rail sections and grades by standard
| Standard | Section | Typical grades |
|---|---|---|
| UIC 860 | UIC54, UIC60 | 700, 900A, 900B |
| EN 13674-1 (≥ 46 kg/m) | 50, 54, 60 kg/m | R200, R260, R260Mn, R320Cr, R350HT, R350LHT, R370CrHT |
| BS 11-1985 | BS80A, BS90A, BS100A | 700, 900A, 900B |
| AREMA | 115RE, 136RE | Standard carbon and high-strength (SS, HH, LA, IH) |
| ASCE | ASCE60, ASCE85 | U71Mn or per specification |
| GB 2585-2007 | 50, 60, 75 kg/m | U71Mn, U75V |
| TB/T 2344-2012 | 50, 60, 75 kg/m | U71Mn, U75V, U77MnCr, U78CrV |
| GB 11264-1989 | 8 – 43 kg/m | Q235, 55Q, 50Mn, U71Mn |
| GB crane rails | QU70 – QU120 | U71Mn |
Why steel selection decides track performance
The durability, safety and performance of a rail system depend critically on steel selection. High-strength alloy steels resist wear, rolling contact fatigue and head deformation, which are essential for both train operation and industrial crane systems. The correct grade is chosen from the expected axle loads, operating speed, climate and track type: heavy-haul corridors need high yield strength and hardness, high-speed lines need excellent surface fatigue resistance, and crane runways need indentation resistance under concentrated wheel loads. Rails produced under strict metallurgical control give uniform mechanical properties along the length, which reduces maintenance frequency and operational risk, and the alloy composition and heat treatment are matched to the environment, whether that is high temperature, cold climate or a high-humidity coastal region.
Frequently asked questions
Why is U71Mn the most common rail steel in China?
U71Mn is a carbon-manganese steel with a good balance of strength, wear resistance and weldability at moderate cost. It is the standard grade for 50 and 60 kg/m rails on Chinese mainlines and for QU crane rails, and it has a long service record.
What is the difference between U71Mn and U75V?
U75V contains a small addition of vanadium (0.04–0.12%), which refines the structure and raises the tensile strength to at least 980 MPa, giving better wear and fatigue resistance. It is used for high-speed and heavy-haul lines where U71Mn would wear too quickly.
Can Q235B be used for railway tracks?
Q235B is a structural steel with a yield strength of at least 235 MPa. It is used for light rails up to about 22–30 kg/m in low-speed industrial and mining service, but it is not suitable for mainline or heavy-haul tracks where hardness and fatigue resistance are required.
What does R350HT mean in the EN standard?
R350HT is a rail grade in EN 13674-1 with a minimum tensile strength of about 1175 MPa and a head hardness of 350–390 HB; HT stands for head hardened. It is the standard grade for heavy-haul and high-speed corridors.
Which standard applies to rails of 27–46 kg/m?
EN 13674-1 covers rails of 46 kg/m and above. Lighter sections between 27 and 46 kg/m are covered by EN 13674-4, and light rails below that follow national standards such as GB 11264, JIS E 1101 or ASCE.
Are rail steel and structural steel interchangeable?
No. Rail steel is specified by dedicated rail standards with tighter composition, hardness and fatigue requirements. Structural steel should not be substituted for rails on load-bearing track without a full engineering review.
