What steel are rails made of?

A steel rail acts as a structural load-transfer medium between rolling equipment and the track foundation, dispersing wheel pressure through its cross-section into sleepers and subgrade materials. Its bending stiffness and lateral stability are critical for preventing rail overturning and track geometry distortion, especially on curves and under eccentric wheel loads.

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What steel are rails made of?

Rails are made of specialized high-carbon steel, commonly referred to as rail steel, which is engineered to provide high strength, wear resistance, and fatigue life under repeated wheel loads. Unlike structural steel, rail steel is optimized for rolling contact performance, not for general construction.

From a chemical composition perspective, most railway and crane rails use carbon–manganese steel with a carbon content typically between 0.6% and 0.8%, combined with controlled levels of manganese, silicon, and sometimes micro-alloying elements such as vanadium or chromium. This composition allows the rail head to achieve high hardness after rolling or heat treatment, while the web and foot retain sufficient toughness to resist cracking and impact.

• In Chinese and many international export projects, a very common rail material is U71Mn, which means approximately 0.71% carbon with manganese alloying. U71Mn offers a good balance between hardness and weldability, making it widely used for mainline railway tracks, industrial sidings, and also for crane rail applications where high surface durability is required. For heavier loads or higher wear environments, upgraded grades such as U75V (vanadium-alloyed) are used to further improve fatigue and wear resistance.

• In European and international standards, rail steels are often classified by minimum tensile strength or hardness level. Typical grades include R260, R320Cr, and R350HT under EN standards, where the number indicates the minimum Brinell hardness of the rail head. R260 is commonly used for conventional lines, while R350HT (head-hardened) is selected for sharp curves, heavy haul routes, and crane runways with high wheel pressure.

• In North American practice, rail steels are specified under AREMA standards using strength and hardness requirements rather than simple grade names, but the metallurgy is still based on high-carbon pearlitic steel with optional head-hardening for severe service. Similarly, Australian, British, and Japanese standards (AS, BS, JIS) all specify rail steels in the same high-carbon pearlitic family, adjusted slightly to match local performance requirements.

American Standard Steel Rail

BS11:1985 Standard Steel Rail

JIS E 1103/1101 Standard Steel Rail

• For crane rails specifically-such as DIN 536 A55, A65, A75, A100, A120 and QU70, QU80, QU100, QU120 profiles-the steel is usually supplied in high-strength pearlitic grades comparable to U71Mn or EN high-hardness classes, because crane wheels impose very high vertical loads and strong lateral forces. In ports, steel mills, and heavy workshops, head-hardened crane rails are often preferred to extend service life and reduce maintenance shutdowns.

DIN 13674-1-2003 Standard Steel Rail

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