What are the properties of crane rail material
Sep 29, 2025
The material properties of crane rails mainly include high strength, wear resistance, fatigue resistance, and toughness, all designed to meet the demands of long-term, high-frequency, and heavy wheel-load operations.
| Rail Type | SIZE(mm) | theoretical weight | |||||||||
| height | bottom width | head width | waist depth | ||||||||
| Crane rail | QU70 | 120 | 120 | 70 | 28 | 52.8 | |||||
| QU80 | 130 | 130 | 80 | 32 | 63.69 | ||||||
| QU100 | 150 | 150 | 100 | 38 | 88.96 | ||||||
| QU120 | 170 | 170 | 120 | 44 | 118.1 | ||||||
First, high strength. Crane rails must withstand concentrated loads from each wheel, far exceeding ordinary train wheel pressure. Rail materials are typically high-manganese steel (such as U71Mn) or alloy steel (such as U75V). Through chemical composition design and heat treatment, the rails achieve sufficient yield strength and bending resistance, preventing plastic deformation under heavy load and impact conditions.
| Steel Grade | C(%) | Si | Mn | Cr | V | P | S | Tensile Strength (Rm/MPa) |
| U71Mn | 0.65~0.76 | 0.15~0.58 | 0.70~1.40 | – | – | ≤0.035 | ≤0.030 | ≥880 |
| U75V | 0.71~0.80 | 0.50~0.80 | 0.75~1.05 | – | 0.04~0.12 | ≤0.035 | ≤0.030 | ≥980 |
Second, wear resistance. Frequent starting, stopping, and braking cause severe wheel-rail contact wear. Rail heads are usually quenched or surface-hardened, reaching hardness levels of HRC 36–42 or higher, improving wear resistance, extending service life, and maintaining operational accuracy.
Third, fatigue resistance. Crane rails endure repeated loads over long-term operation, which can cause fatigue cracks. Material toughness and cross-sectional design must prevent brittle fracture under high-frequency cycles. Thickened web and base sections help distribute stress and enhance overall fatigue performance.
Additionally, crane rail materials require sufficient toughness and machinability to maintain stability during cutting, drilling, end-face grinding, and installation, while accommodating various foundations such as concrete or steel beams. For special environments, anti-corrosion treatment or surface strengthening can ensure long-term safe operation under high humidity, corrosive, or high-temperature conditions.
GNEE RAIL provides crane rails in various materials, including U71Mn and U75V, and offers cutting, drilling, end-face grinding, and anti-corrosion processing services to meet the requirements of cranes with different tonnage, span, and operating environments. For professional advice and selection solutions, please contact us for support.
