GB/T 36152-2018 Crane Wheel and Flange Standard Guide
GB/T 36152-2018 "Cranes — Wheels and Wheel Flanges" is the dedicated standard for the design, manufacturing, and acceptance of crane wheels. It specifies types and dimensions, technical requirements, materials and heat treatment, test methods, and inspection rules for crane wheels. The standard applies to crane travel wheels and trolley wheels used in overhead and gantry cranes, as well as wheels for rail-mounted lifting appliances such as portal cranes.
GB/T 36152-2018 is the governing standard for the design, manufacturing, and acceptance of crane wheels. It defines wheel types and dimensions, material heat treatment, tread and flange parameters, as well as inspection and scrapping criteria. As core components of the crane travel mechanism, wheel quality directly affects the operating stability and service life of the entire machine.
Wheel Types and Dimension Range
GB/T 36152-2018 classifies crane wheels by flange type: Double-flanged wheels (flanges on both sides, suitable for standard crane rails and the most common type for overhead and gantry cranes — the flanges guide the wheel along the rail and prevent derailment), single-flanged wheels (flange on one side only, used where a guard wall exists beside the rail or for certain trolley wheels, offering a simpler structure), and flat wheels (no flange, used in conjunction with horizontal guide rollers, typically on large-span gantry cranes to reduce lateral forces caused by skewing). By tread profile, wheels are divided into cylindrical tread (a flat cylindrical surface, the most widely used type for both crane bridge and trolley travel) and conical tread (with a 1:10 or 1:20 taper; the cone facing forward enables self-aligning and reduces rail gnawing).
The standard specifies a wheel diameter range from Φ200mm to Φ1250mm across 28 sizes (200, 250, 315, 350, 400, 450, 500, 560, 630, 710, 800, 900, 1000, 1120, 1250, etc.). Wheel tread width is determined by the wheel diameter and the rail section used.
Materials and Heat Treatment
The standard specifies wheel material requirements: recommended materials are 65Mn, 60Si2Mn, or 42CrMo, with the tread and flange achieving specified hardness after through hardening and tempering. 65Mn — the most commonly used wheel material, offering excellent hardenability and wear resistance; tread hardness HB300~380, flange hardness HB280~360. 60Si2Mn — a spring steel wheel material with better elasticity and fatigue resistance than 65Mn, suitable for crane wheels subject to significant impact loads; tread hardness HB320~400. 42CrMo — an alloy steel wheel material with the best overall mechanical properties and hardenability, used for heavy-duty cranes and large-diameter wheels (Φ≥800mm); tread hardness HB340~420.
The standard also specifies the hardened layer depth: the hardened depth on both the tread and flange must be no less than 15mm (hardness at 15mm depth must still be ≥HB260), ensuring the wheel does not fail prematurely due to insufficient internal hardness after prolonged wear. After through hardening, wheels must be tempered to relieve quenching stress and adjust hardness to the specified range.
Kelude crane wheels are manufactured in accordance with GB/T 36152, using 65Mn with hardened treads as standard, and 42CrMo alloy steel for critical applications.
Tread and Flange Dimensional Requirements
The standard sets detailed tolerances for critical wheel dimensions: Wheel diameter tolerance — the manufacturing tolerance for the nominal wheel diameter is h9 (for precision fits) or h11 (for general use). Tread width tolerance — the dimensional tolerance after machining is ±0.5mm. Flange height — single-side flange height h≥20mm (for wheel diameters ≤500mm) or h≥25mm (for wheel diameters >500mm).
Flange thickness — the thickness at the flange root b≥16mm (D≤500mm) or b≥20mm (D>500mm). Tread radial runout — measured across the tread width relative to the reference bore, radial runout must not exceed 0.1% of the wheel diameter, with a maximum of 0.5mm. Face runout — the axial runout of the inner flange face relative to the reference bore must not exceed 0.15% of the wheel diameter, with a maximum of 0.8mm.
Excessive face runout can cause the wheel to skew on the rail and lead to flange wear. Wheel-to-rail contact width — the wheel tread width should be 10~20mm wider than the rail head width, ensuring adequate contact area under varying span and rail gauge deviations.
Wheel-to-Rail Fit Requirements
The standard specifies key requirements for wheel-to-rail compatibility: Rail types — wheels must be used in conjunction with the following rail sections: P38, P43, P50, P60 railway rails, or QU70, QU80, QU100, QU120 crane rails per YB/T 5055. The wheel tread width must be 10~20mm wider than the corresponding rail head width. Rail gauge deviation — for crane travel, the rail gauge deviation must not exceed ±5mm (for spans ≤30m) or ±8mm (for spans >30m).
The elevation difference between the two rails at the same cross-section must not exceed 10mm. Wheel installation accuracy — the horizontal skew (the included angle between the wheel axle and the rail centerline in the horizontal plane) must not exceed 0.4mm/m (i.e., ≤0.4mm deviation per meter of length). The vertical skew (the included angle between the wheel axle and the horizontal plane in the vertical plane) must not exceed 0.2mm/m.
Excessive skew leads to poor wheel-to-rail contact, causing rail gnawing, abnormal flange wear, and increased travel resistance. The standard also requires that the wheel diameter difference among wheels on the same crane must not exceed 0.1% of the nominal wheel diameter (e.g., for a Φ500mm wheel, the diameter difference must be ≤0.5mm), ensuring even load distribution across all wheels.
Inspection and Scrapping Criteria
Standard wheel inspection and scrapping criteria: Factory Acceptance Test — each wheel shall undergo dimensional inspection (diameter, width, flange height, flange thickness, axial and radial runout tolerance checks), hardness test (three measurement points on both the tread surface and wheel flange), and visual inspection (free from cracks, porosity, pinholes, slag inclusion, and other defects). Type test — includes mechanical properties test (tensile strength and impact toughness), hardened layer depth detection (measured on a wheel cross-section using either the hardness method or microstructural method), and fatigue test. A wheel shall be scrapped under the following conditions: Tread surface wear — when the wear amount on the wheel tread reaches 15% of the original tread thickness, the wheel shall be scrapped (e.g., for a Φ500mm crane wheel with an original tread thickness of approximately 60mm, replacement is required once the thickness wears down to 51mm).
Flange wear — when the remaining thickness on one side of the wheel flange falls below 50% of the original thickness, the wheel shall be scrapped. Fatigue spalling on the tread surface — scrapping is required when the depth of fatigue spalling exceeds 2mm or the affected area exceeds 15% of the tread surface area. Cracks on the wheel — any crack, regardless of size, renders the wheel unfit for continued service and mandates replacement.
Wear at the wheel bearing area — the wheel shall be replaced when bearing bore wear causes the fit clearance to exceed twice the original fit tolerance.
| Parameter | 65MnCrane wheel | 60Si2MnCrane wheel | 42CrMoCrane wheel |
|---|---|---|---|
| tread hardness | HB300~380 | HB320~400 | HB340~420 |
| hardened layer depth | ≥15mm | ≥15mm | ≥20mm |
| Impact Toughness | Medium | High | High |
| Applicable Diameter | ≤800mm | ≤1000mm | ≥800mm |
| Applicable Model | Small-to-Mediumbridge and gantry crane | Medium-to-Largebridge and gantry crane | Heavy-Duty Metallurgical Crane |
| Relative Cost | Baseline | ×1.3 | ×1.8 |
FAQ: Crane Wheel Heat Treatment, Alignment & Rail Joints
Q: Why is heat treatment necessary for crane wheels?
A: The heat treatment process (medium-frequency induction hardening followed by tempering) creates a high-hardness wear-resistant layer on the tread surface while preserving the toughness of the wheel body. With a hardened layer depth of ≥15mm and a hardness of HB300–380, wheel service life is significantly extended. Kelude Heavy Industry manufactures crane wheels strictly in accordance with the heat treatment requirements of GB/T 36152, and every production batch undergoes hardness testing and metallographic analysis.
Q: How does wheel misalignment affect crane operation?
A: Horizontal or vertical misalignment beyond the allowable limits increases running resistance, raises motor current, and causes abnormal wear on both the wheels and the crane rail. Installation requirements specify a maximum horizontal misalignment of ≤L/1000, vertical misalignment of ≤L/400, and a diagonal difference of ≤5mm. If these values are exceeded, adjustment should be carried out promptly; otherwise, accelerated wheel wear and scrapping will result, along with compromised operating stability of the crane.
Q: What is the allowable diameter difference among the four wheels on a single crane?
A: The standard requires that the diameter difference among all wheels on the same crane not exceed 0.5mm. Inconsistent diameters can cause the smaller wheels to lose contact or make poor contact with the rail, leading to uneven wheel load distribution, trolley or bridge oscillation, and non-synchronized travel speeds. Wheel diameter should be measured at the center of the tread surface under cold conditions, avoiding the hardened layer transition zone. When replacing wheels, always use matched sets.
Q: How do rail joints affect wheel service life?
A: Rail joints are a primary source of impact during wheel travel. Vertical step and lateral offset at the joint are transmitted directly to the wheel as impact load. The standard requires a vertical step of ≤1mm and lateral offset of ≤1mm. Expansion gaps should be set at 4–6mm in winter and 6–8mm in summer; improper gap settings accelerate fatigue on the wheel tread surface. A monthly inspection of rail joint condition is recommended.
