What Is Railroad Metal Made Of And How Hard Is It?
Jan 22, 2026
A steel rail is the core load-bearing component of any railway or crane track system, manufactured from high-strength alloy steel to resist wear, impact, and long-term fatigue under rolling loads. In engineering terms, the railroad metal used in tracks is not ordinary structural steel but bold: steel rail grade material with controlled carbon and manganese content, sometimes micro-alloyed with vanadium or chromium to improve hardness and fatigue life.
At GNEE RAIL, we supply steel rails for railway lines, mining tracks, and industrial crane systems, together with fastening systems, baseplates, and customized machining to deliver complete track solutions for international projects.
- Rail steel must simultaneously achieve high hardness for wear resistance and sufficient toughness to avoid brittle fracture.
- This balance is achieved through precise chemical composition control and specialized rolling and heat-treatment processes.
What Is Railroad Metal Made Of in Modern Rail Production?
Most modern rails are produced from carbon–manganese alloy steel, with carbon typically between 0.6% and 0.8% and manganese around 1.0% to 1.5%.Carbon increases hardness and wear resistance, while manganese improves strength and reduces brittleness.For higher performance lines, micro-alloying elements such as vanadium may be added to refine grain structure.
- Typical steel grades include U71Mn and U75V under GB standards, and R260 or R350HT under EN standards.
- For industrial crane rails, DIN 536 and QU series profiles often use similar metallurgical bases but with stricter shape and surface requirements.
These compositions allow rails to withstand millions of load cycles without excessive plastic deformation.
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 |
Which Rail Sizes and Profiles Are Commonly Supplied for Sales Projects?
In practical procurement, buyers focus on standardized rail profiles that match existing track systems.For sales and project supply, the following rail sizes are the most frequently specified and stocked by GNEE RAIL.
Light Rail, Heavy Rail, and Crane Rail
| Classification | Height(mm) | Head (mm) | Bottom (mm) | Thick(mm) | Weight (kg/m) | |
| Light Rail | 8 KG/M | 65 | 25 | 54 | 7 | 8.42 |
| 9 KG/M | 63.5 | 32.1 | 63.5 | 5.9 | 8.94 | |
| 12 KG/M | 69.85 | 38.1 | 69.85 | 7.54 | 12.2 | |
| 15 KG/M | 79.37 | 42.86 | 79.37 | 8.33 | 15.2 | |
| 18 KG/M | 80 | 40 | 80 | 10 | 18.06 | |
| 22 KG/M | 93.66 | 50.8 | 93.66 | 10.72 | 22.3 | |
| 24 KG/M | 107 | 51 | 90 | 10.9 | 24.46 | |
| 30 KG/M | 107.95 | 60.33 | 107.95 | 12.3 | 30.1 | |
| Heavy Rail | 38 KG/M | 134 | 68 | 114 | 13 | 38.733 |
| 43 KG/M | 140 | 70 | 114 | 14.5 | 44.653 | |
| 45 KG/M | 145 | 67 | 126 | 14.5 | 45.546 | |
| 50 KG/M | 152 | 70 | 132 | 15.5 | 51.514 | |
| 60 KG/M | 176 | 73 | 150 | 16.5 | 60.64 | |
| 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 | |
DIN 536 Crane Rail Standard
| Size | Head (mm) | Height (mm) | Bottom (mm) | Thick (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| A55 | 55 | 65 | 150 | 31 | 31.8 |
| A65 | 65 | 75 | 175 | 38 | 43.1 |
| A75 | 75 | 85 | 200 | 45 | 56.2 |
| A100 | 100 | 95 | 200 | 60 | 74.3 |
| A120 | 120 | 105 | 200 | 72 | 100 |
UIC 860 European Railway Rail
| Size | Head (mm) | Height (mm) | Bottom (mm) | Thick (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| UIC50 | 70 | 152 | 125 | 15 | 50.46 |
| UIC54 | 70 | 159 | 140 | 16 | 54.43 |
| UIC60 | 74.3 | 172 | 150 | 16.5 | 60.21 |
BS11:1985 British Rail Profiles
| Size | Head (mm) | Height (mm) | Bottom (mm) | Thick (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 50O | 52.39 | 100.01 | 100.01 | 10.32 | 24.833 |
| 60A | 57.15 | 114.3 | 109.54 | 11.11 | 30.618 |
| 75A | 61.91 | 128.59 | 114.3 | 12.7 | 37.455 |
| 75R | 61.91 | 128.59 | 122.24 | 13.1 | 37.041 |
| 80A | 63.5 | 133.35 | 117.47 | 13.1 | 39.761 |
| 80R | 63.5 | 133.35 | 127 | 13.49 | 39.674 |
| 90A | 66.67 | 142.88 | 127 | 13.89 | 45.099 |
| 100A | 69.85 | 152.4 | 133.35 | 15.08 | 50.182 |
| 113A | 69.85 | 158.75 | 139.7 | 20 | 56.398 |
AREMA / ASCE American Rail
| Size | Head (mm) | Height (mm) | Foot (mm) | Thick (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| ASCE25 | 38.1 | 69.85 | 69.85 | 7.54 | 12.4 |
| ASCE30 | 42.86 | 79.38 | 79.38 | 8.33 | 14.88 |
| ASCE40 | 47.62 | 88.9 | 88.9 | 9.92 | 19.84 |
| ASCE60 | 60.32 | 107.95 | 107.95 | 12.3 | 29.76 |
| ASCE75 | 62.71 | 122.24 | 122.24 | 13.49 | 37.2 |
| ASCE85 | 65.09 | 131.76 | 131.76 | 14.29 | 42.17 |
| ASCE90 | 69.09 | 130.18 | 142.88 | 14.29 | 44.65 |
| ASCE115 | 69.06 | 139.7 | 168.28 | 15.88 | 56.9 |
| ASCE136 | 74.61 | 152.4 | 185.74 | 17.46 | 67.41 |
| ASCE175 | 109.86 | 152.4 | 152.4 | 38.1 | 86.8 |
How Hard Is Railroad Steel and Why Does Hardness Matter?
Rail hardness is typically measured using the Brinell hardness scale (HB).Standard carbon-manganese rails generally range from 260 to 360 HB, depending on steel grade and heat treatment.Higher hardness improves wear resistance but reduces ductility, so excessive hardness may increase cracking risk.
- For example, R260 rails typically maintain around 260 HB, suitable for mixed passenger and freight lines.
- R350HT rails are head-hardened and can exceed 350 HB, extending service life in curves and heavy-haul sections.
- Crane rails also require high surface hardness to resist indentation from concentrated wheel loads.
Hardness also influences maintenance cycles and grinding frequency.Softer rails deform faster, while harder rails resist profile degradation.Therefore, hardness is directly linked to lifecycle cost and operational reliability.
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.
