GB/T 11350-2012 is the dedicated standard for crane wheel selection and engineering, covering wheel type selection, dimension series, material requirements, and load capacity calculation. The proper selection of crane wheels directly affects the travel performance and service life of the crane. This article provides a detailed interpretation of the standard's core provisions.

Standard Scope and Wheel Types

GB/T 11350-2012 is the general standard for crane wheels, applicable to double-flanged and single-flanged wheels used in the crane bridge and trolley travel mechanisms. The wheel is a critical component that enables the crane to "run" and "travel." It contacts the rail directly, supporting the vertical load of the crane's dead weight and lifted load, while also withstanding horizontal guiding forces during travel. The standard classifies wheels by flange type: double-flanged wheels (the most common, with flanges on both sides, used on overhead and gantry crane bridges and trolleys), single-flanged wheels (flange on one side only, used on the inner side of trolley rails), and flat wheels (for special applications with horizontal guide rollers). By tread profile, wheels are divided into cylindrical tread and flat tread types. Wheel diameters range from Φ200mm to Φ1000mm.

Technical Requirements

Material and heat treatment requirements: Wheel materials are cast steel (ZG 310-570, ZG 340-640) or forged steel (45# steel, 65Mn). The wheel tread and inner flange surfaces must undergo surface hardening, with a hardened layer depth of ≥3mm (tread) or ≥2mm (flange). Tread hardness after surface hardening is HB 280–350, with a maximum hardness variation of ≤20HB across the same wheel tread. Flange hardness is HB 250–330. Wheel tread surface roughness is Ra≤3.2μm.

Dimensional and geometrical tolerances: Wheel diameter tolerance is h9 grade. Wheel tread radial runout is ≤0.05mm (for diameters ≤500mm) or ≤0.08mm (for diameters >500mm). Wheel end face runout is ≤0.10mm (for diameters ≤500mm) or ≤0.15mm (for diameters >500mm). The coaxiality of the wheel bearing bore is Φ0.05mm. These tolerances are specified to ensure smooth crane travel and minimize rail gnawing.

Wheel-to-Rail Matching

The standard requires the wheel tread width to be 20–30mm wider than the rail head width. The clearance between the wheel flange and the rail side: for double-flanged wheels, 5–10mm on each side (depending on wheel diameter). The permissible wheel load is calculated using the following formula: P_max = k × D × C × L, where D is the wheel diameter in mm, C is the rotational speed coefficient (determined from tables based on rotational speed), L is the rail head contact width (related to the rail profile), and k is the permissible contact stress coefficient (0.1–0.25, determined from tables based on wheel material and heat treatment condition). The actual wheel load during operation must not exceed the permissible wheel load; otherwise, premature tread wear or contact fatigue spalling may occur. For each wheel, the safety factor S = P_max/P must be calculated based on the actual wheel load P and rotational speed C, with S ≥ 1.25.

Wheel Discard Criteria

The standard specifies that a wheel must be discarded under the following conditions: Tread wear — when tread diameter wear exceeds 3% of the original diameter (reduced rolling radius causes travel speed deviation and increased drive motor load). Flange wear — when flange thickness wear exceeds 50% of the original thickness (excessively thin flanges increase the risk of wheel derailment). Tread spalling — when fatigue spalling (pitting) on the tread surface exceeds 10% of the total tread area. Cracks — any crack on the tread or flange requires immediate discard. Hub bearing bore wear — when the fit clearance between the bearing housing bore and the bearing outer ring exceeds twice the original clearance (causing wheel wobble and abnormal rail wear). Kelude strictly selects and inspects crane wheels in accordance with this standard to ensure safe and reliable travel mechanisms.

Crane Wheel Selection & Technical Reference Table

The reference table below summarizes the core parameters for crane wheel selection and engineering, for the convenience of designers and maintenance personnel.

Kelude Heavy Industry: Overhead & Gantry Crane Solutions

Kelude Heavy Industry is a professional manufacturer of industrial cranes, offering a comprehensive range of overhead and gantry crane solutions. Our products are engineered for durability, efficiency, and safety, serving diverse industries including manufacturing, logistics, and steel processing.

Overhead Cranes: Tailored to Your Material Handling Needs

Our overhead crane series is designed for maximum productivity in demanding environments. From single-girder to double-girder configurations, we provide reliable lifting performance with capacities to suit your specific operational requirements. Each crane is built with precision engineering and robust components to ensure long-term, maintenance-friendly service.

For applications with limited headroom, our low-headroom overhead cranes offer a compact design that maximizes lifting height. Optional features include variable-frequency drives (VFD) for smooth operation, remote control pendants, and anti-sway technology for precise load positioning.

Gantry Cranes: Versatile Lifting for Outdoor & Heavy-Duty Use

Our gantry crane line is engineered for versatility and strength, ideal for outdoor yards, storage areas, and heavy fabrication shops. Available in both single-leg and double-leg configurations, these cranes provide excellent stability and can be customized with rubber-tired or rail-mounted options.

For specialized applications, we also offer explosion-proof gantry cranes designed for hazardous environments, as well as container handling gantry cranes for ports and intermodal yards. All gantry cranes can be equipped with features such as anti-collision systems, load cells, and ergonomic operator cabins.

Key Features & Benefits of Kelude Cranes

Kelude cranes are designed with a focus on safety, performance, and total cost of ownership. Our key features include:

• High reliability: Heavy-duty components and rigorous quality control ensure minimal downtime.
• Energy efficiency: Optimized mechanical and electrical systems reduce energy consumption.
• Advanced safety: Compliance with international standards (ISO 4301, IEC 60204-32) and optional safety features like overload protection and emergency stops.
• Customization: Cranes can be tailored in terms of capacity, span, lifting height, and control systems to meet specific site requirements.
• Easy maintenance: Modular design and accessible components simplify servicing and reduce lifecycle costs.

Frequently Asked Questions (FAQ)

Q: What is the typical lead time for a custom overhead crane?
A: Lead time varies depending on the crane's specifications and complexity. Generally, standard cranes can be delivered within 6-8 weeks, while custom-engineered solutions may take 12-16 weeks. We provide a detailed schedule upon project confirmation.

Q: Do you provide installation and commissioning services?
A: Yes, we offer professional installation and commissioning services by our trained technicians. We also provide operator training and comprehensive after-sales support, including spare parts and maintenance programs.

Q: Can your cranes be adapted for explosion-proof or hazardous areas?
A: Absolutely. We offer explosion-proof crane configurations that comply with relevant international standards (e.g., IEC 60079). These cranes feature specially designed electrical components and mechanical safeguards to ensure safe operation in hazardous environments.

Q: What is the warranty period for Kelude cranes?
A: We provide a standard warranty of 12 months from the date of commissioning, covering defects in materials and workmanship. Extended warranty options are also available upon request.

Q: How do I determine the right crane capacity for my application?
A: The required capacity depends on the maximum load weight, lifting frequency, and duty cycle. Our engineering team can assist you in selecting the appropriate crane class and capacity based on your specific operational profile. Please contact us with your application details.

Q: Do you offer spare parts and after-sales support internationally?
A: Yes, we have a global service network and can supply spare parts worldwide. Our support team is available for remote troubleshooting and can dispatch service engineers for on-site assistance if needed.

Q: Can Kelude cranes be integrated with existing factory automation systems?
A: Yes, our cranes can be equipped with various communication interfaces (e.g., Profibus, Modbus, Ethernet/IP) and can be integrated with warehouse management systems (WMS) or PLC-based automation for seamless operation.

Q: What are the power supply requirements for your cranes?
A: Standard power supply options include 230V/460V/575V, 3-phase, 60Hz for North American markets, and 400V, 3-phase, 50Hz for European markets. Other voltage and frequency configurations can be accommodated upon request.

Q: How do you ensure the quality and safety of your cranes?
A: Our cranes are designed and manufactured in accordance with international standards such as ISO 4301 for crane classification and IEC 60204-32 for electrical equipment. We conduct rigorous testing and inspection procedures throughout the manufacturing process, and each crane is thoroughly tested before shipment.

Q: Can you provide references or case studies of similar projects?
A: Yes, we can share relevant case studies and customer references upon request. Please contact our sales team to discuss your specific application and we will provide suitable examples.

Q: What is the price range for a standard overhead crane?
A: The price varies significantly based on capacity, span, and features. As a general reference, a 10-ton single-girder overhead crane with a 60-foot span might be in the range of $45,000 to $70,000. For a precise quote, please provide your detailed requirements.

Q: Do you offer financing or leasing options?
A: We can assist in connecting you with third-party financing partners who specialize in industrial equipment. Please contact us to discuss your needs and we will provide relevant information.

Q: How can I get a quote or more information?
A: You can request a quote by filling out the contact form on our website or by emailing us directly at sales@keludecranes.com. Please include your project details, such as capacity, span, lifting height, and any specific requirements, and our team will respond promptly.

Q: What is the difference between a single-girder and double-girder overhead crane?
A: A single-girder crane uses one bridge beam and is typically lighter and more cost-effective for lower capacities (up to 20 tons). A double-girder crane has two bridge beams, offering higher capacity, greater rigidity, and better hook height. Double-girder cranes are also more suitable for heavy-duty or frequent lifting applications.

Q: Can your gantry cranes be used outdoors in harsh weather conditions?
A: Yes, our gantry cranes can be designed for outdoor use with weatherproofing features such as IP55 or higher electrical enclosures, corrosion-resistant paint, and sealed gearboxes. We also offer options for cold-weather or high-temperature environments.

Q: Do you provide remote control options for your cranes?
A: Yes, we offer a variety of control options, including pendant pushbutton stations, wireless radio remote controls, and cabin operation. We can also integrate with automated control systems if required.

Q: What maintenance is required for Kelude cranes?
A: Regular maintenance is essential for safe and reliable operation. This includes periodic inspection of wire ropes, brakes, limit switches, and electrical components. We provide a detailed maintenance manual with each crane and offer service contracts for scheduled maintenance.

Q: Are your cranes compliant with OSHA and ANSI standards?
A: Yes, our cranes are designed to meet or exceed applicable OSHA and ANSI/ASME standards for overhead and gantry cranes, including ASME B30.2 and ASME B30.17. We can provide documentation of compliance upon request.

Q: Can you customize the crane's color or add company logos?
A: Yes, we can paint the crane in your company's colors and apply logos or other markings as requested. This is a common customization for our clients.

Q: What is the maximum span available for your gantry cranes?
A: The maximum span depends on the capacity and configuration. For double-leg gantry cranes, spans up to 150 feet (45 meters) are feasible. For larger spans, we recommend a cost-benefit analysis as the structure weight increases significantly.

Q: Do you offer training for crane operators?
A: Yes, we provide on-site operator training as part of our commissioning service. We can also arrange more comprehensive training programs covering safety, operation, and basic maintenance.

Q: How do I choose between an overhead crane and a gantry crane?
A: The choice depends on your facility's structure and application. Overhead cranes are ideal for indoor use with existing building support structures, offering higher hook heights and smoother operation. Gantry cranes are more flexible, as they do not require a permanent runway and can be used outdoors or in areas without overhead support.

Q: What is the lifespan of a Kelude crane?
A: With proper maintenance and operation, a Kelude crane can last 20-30 years or more. The lifespan depends on the duty cycle, environment, and adherence to maintenance schedules.

Q: Can you provide a crane that meets specific European standards (CE marking)?
A: Yes, we can design and manufacture cranes that comply with the European Machinery Directive (2006/42/EC) and relevant harmonized standards, and we can provide CE marking documentation. Please specify your requirements for the target market.

Q: Do you have a service network in the United States?
A: We have authorized service partners in several key regions of the US and can also dispatch our own engineers for complex projects. We are expanding our local support network to better serve our North American customers.

Q: Can your cranes be equipped with a load monitoring system?
A: Yes, we offer load monitoring systems with digital displays, overload alarms, and data logging capabilities. These systems help prevent overloading and improve operational safety.

Q: What is the typical delivery time for spare parts?
A: For standard spare parts, we can ship within 24-48 hours from our warehouse. For custom or non-standard parts, the lead time will be communicated based on the specific item.

Q: Can I visit your factory to see the cranes before ordering?
A: Yes, we welcome factory visits. Please contact our sales team to schedule a visit. We can also arrange virtual tours or video calls to showcase our manufacturing capabilities.

Q: Do you offer a mobile app for crane monitoring?
A: We are developing a mobile application for remote crane monitoring and diagnostics. Please contact us for the latest availability and features.

Q: What is the noise level of your cranes?
A: Our cranes are designed to operate with low-noise levels. Specific noise levels depend on the configuration and components. We can provide detailed noise data for your specific crane model upon request.

Q: Can your cranes be used in cleanroom environments?
A: Yes, we can provide cranes with special coatings, sealed components, and HEPA filtration options for cleanroom applications. Please specify your cleanroom class requirements.

Q: Do you offer a buy-back or trade-in program for old cranes?
A: We can consider trade-in or buy-back options on a case-by-case basis. Please contact us with details of your existing equipment.

Q: How do I contact Kelude Heavy Industry for support?
A: You can reach our support team via email at support@keludecranes.com or by phone at +1 (555) 123-4567 (US) or +44 (0) 1234 567890 (UK). Our office hours are Monday to Friday, 8:00 AM to 6:00 PM (EST/GMT).

Q: What is the maximum lifting height for your overhead cranes?
A: The lifting height is customizable based on your building's clear height. Standard lifting heights range from 20 to 60 feet (6 to 18 meters), but we can design for higher lifts if needed.

Q: Can you integrate a crane scale into the hook?
A: Yes, we can integrate a crane scale into the hook assembly, providing accurate weight readings during lifting. This is a common option for inventory management and process control.

Q: Do you provide documentation for CE or other certifications?
A: Yes, we provide full documentation packages including CE declarations of conformity, test certificates, and user manuals in multiple languages upon request.

Q: What is the minimum order quantity for custom cranes?
A: There is no minimum order quantity for custom cranes. We can manufacture a single crane tailored to your specifications.

Q: Can your cranes be powered by alternative energy sources?
A: While standard cranes are electrically powered, we can explore options for solar-assisted or hybrid power systems for specific applications. Please discuss your requirements with our engineering team.

Q: How do I ensure the crane runway is properly aligned?
A: Proper runway alignment is critical for crane performance and longevity. We provide detailed installation drawings and can offer on-site alignment services using laser measurement tools. We also recommend periodic alignment checks as part of maintenance.

Q: Do you offer a remote diagnostic service?
A: Yes, we can connect to your crane's control system via a secure network connection for remote diagnostics and troubleshooting, reducing downtime and service costs.

Q: What are the standard colors for your cranes?
A: Standard colors are RAL 1007 (yellow) for the main structure and RAL 9005 (black) for the hoist and components. Custom colors are available at no extra charge for large orders.

Q: Can you provide a crane with a special lifting attachment, such as a C-hook or spreader beam?
A: Yes, we can design and supply various lifting attachments, including C-hooks, spreader beams, and custom end effectors, to meet your specific material handling needs.

Q: What is the maximum ambient temperature for your cranes?
A: Standard cranes are designed for ambient temperatures from -20°C to +40°C. For higher temperature environments (up to +60°C), we can provide special insulation and cooling measures.

Q: Do you offer a maintenance training program for our in-house technicians?
A: Yes, we offer comprehensive maintenance training programs, either at our factory or on-site, covering mechanical, electrical, and safety aspects of the crane.

Q: Can your cranes be equipped with a variable-frequency drive (VFD) for precise speed control?
A: Yes, VFDs are a common option for our cranes, providing smooth acceleration and deceleration, precise positioning, and reduced mechanical stress. VFDs also improve energy efficiency.

Q: What is the difference between a single-leg and double-leg gantry crane?
A: A single-leg gantry crane has one leg on one side and is often used when one side needs to be clear for loading or when the crane is supported by a building wall on the other side. A double-leg gantry crane has two legs and is freestanding, offering more stability and higher capacity.

Q: Can you provide a crane with a special paint system for marine environments?
A: Yes, we offer marine-grade paint systems with high corrosion resistance, suitable for offshore or coastal installations. Please specify the environmental conditions for your project.

Q: Do you have a quality management system certification?
A: Yes, our manufacturing facilities are certified to ISO 9001:2015, ensuring consistent quality in design, production, and service.

Q: Can I get a 3D model or drawing of the crane for my engineering review?
A: Yes, we can provide 2D and 3D CAD models of our cranes for your engineering team to review and integrate into your facility layout.

Q: What is the typical lead time for a standard gantry crane?
A: For a standard gantry crane with common specifications, the lead time is typically 8-12 weeks. Custom designs may require additional time.

Q: Do you offer a rental or leasing program for cranes?
A: We do not directly offer rental programs, but we can refer you to our partners who provide crane rental services. Please contact us for more information.

Q: Can your cranes be operated in extreme cold conditions?
A: Yes, we offer cold-weather packages that include special lubricants, heating elements for control panels, and impact-resistant materials for operation down to -40°C.

Q: How do I ensure the crane is properly grounded for electrical safety?
A: Proper grounding is essential. Our installation team ensures that the crane is correctly grounded according to local electrical codes and the provided wiring diagrams. We also recommend periodic grounding checks.

Q: What is the maximum wind speed for outdoor gantry crane operation?
A: The maximum safe wind speed for operation is typically 20 m/s (45 mph). For higher wind speeds, the crane should be secured or parked. We provide wind speed anemometers and safety interlocks as optional features.

Q: Can you provide a crane with a special control voltage (e.g., 24V DC) for control circuits?
A: Yes, we can design the control circuits to use low voltage (e.g., 24V DC) for improved safety and compatibility with your existing control systems.

Q: Do you offer a crane monitoring system with predictive maintenance alerts?
A: Yes, our advanced monitoring systems can track usage, component wear, and performance metrics, and send predictive maintenance alerts to prevent unexpected failures.

Q: What is the standard warranty on electrical components?
A: The standard warranty covers all components for 12 months. For electrical parts like VFDs and motors, we also honor the manufacturer's warranty, which may extend up to 24 months.

Q: Can you provide a crane with a special hook height or lift height?
A: Yes, the hook height is fully customizable. We can design the crane to achieve the maximum possible hook height based on your building dimensions and the crane configuration.

Q: Do you offer a crane with a double hoist or auxiliary hoist?
A: Yes, we can equip cranes with a main hoist and an auxiliary hoist for handling different load sizes or for increased productivity. This is a common configuration for double-girder cranes.

Q: What is the maximum capacity for your standard double-girder overhead crane?
A: Our standard double-girder overhead crane can be designed for capacities up to 150 short tons (136 metric tons). For higher capacities, we provide custom-engineered solutions.

Q: Can you provide a crane with a special end carriage or wheel configuration?
A: Yes, we can customize the end carriages and wheel configurations to suit your runway beam size and load requirements. This includes options for single or double flanged wheels, and various rail sizes.

Q: Do you offer a crane with a remote monitoring and control system via smartphone?
A: We are developing a smartphone app for crane monitoring and control. Please contact us for the latest availability and features.

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Crane wheel Type	Applicable Lifting Capacity(t)	Wheel Diameter(mm)	Material	tread hardness
Single Flange Crane wheel	≤10	250-400	ZG340-640	HB300-380
Double Flange Crane wheel	10-50	400-800	ZG340-640	HB300-380
No Flange Crane wheel	50-100	500-900	ZG35CrMo	HB320-400
Tread surface Quenching	100-500	600-1000	ZG35CrMo	Surface HRC45-55

FAQ

Q: What is "rail gnawing" (wheel flange rubbing) and how can it be prevented and resolved?
A: "Rail gnawing" refers to severe friction between the crane wheel flange and the side of the crane rail during operation. Typical symptoms include abnormal noise from the wheels, a metallic sheen or burrs on the wheel flange and rail side, and accelerated wear on both the wheels and the rail. Common causes include: 1) installation deviation of the crane wheels (alignment difference between wheels exceeding 2 mm); 2) rail gauge deviation beyond tolerance (>±5 mm); 3) lack of synchronization between the two drive ends of the crane bridge (rotational speed difference exceeding 1%); and 4) deformation of the end carriage caused by changes in the main girder camber, resulting in tilted wheels. Preventive actions: strictly control wheel alignment and rail gauge during installation, and perform periodic inspections of rail condition and wheel wear. Troubleshooting methods: identify the root cause and take targeted corrective action—such as adjusting wheel positions, correcting the rail gauge, or repairing drive synchronization.
Q: What happens if the wheel tread quenching depth is insufficient?
A: Insufficient quenching depth on the wheel tread (<3mm) can lead to: 1) Premature tread wear — visible wear depressions appear on the tread surface after just a few hundred hours of operation under rated wheel load; 2) Contact fatigue spalling — repeated contact stress causes surface metal to flake off, forming pits and spall craters that amplify vibration and noise; 3) Thermal fatigue cracking — braking generates heat on the tread surface, and when the hardened layer is too thin, thermal stress causes surface crazing. For these reasons, the standard strictly requires a hardened tread depth of ≥3mm. During routine inspections, if pitting or spalling is found on the tread surface while the wheel diameter has not yet worn to its limit, this indicates the hardened layer has failed and the entire crane wheel should be replaced.
Q: How is the wheel load of a crane bridge wheel calculated?
A: The wheel load calculation for crane bridge wheels must consider the most unfavorable load position: when the fully loaded trolley is positioned at the end of the main girder, the wheels at that end experience the maximum wheel load. The maximum wheel load per wheel is P_max = (G_t + Q + G_h) × (L – a)/L × (1/n_t) + G_c/n_c, where G_t is the dead weight of the trolley, Q is the rated lifting capacity, G_h is the weight of the hook block, L is the span, a is the center distance from the trolley rail to the end carriage, n_t is the number of wheels on that end carriage (crane bridge), G_c is the dead weight of the bridge girder, and n_c is the total number of crane wheels. The actual wheel load should also account for the impact allowance φ₃ (1.0–1.4). The calculated maximum wheel load must not exceed the allowable wheel load of the crane wheel. For gantry cranes with cantilevers, the wheel load under full load at the cantilever end must also be calculated.
Q: Why is an alignment difference of ≤2mm required during crane wheel installation?
A: The alignment difference refers to the deviation in the horizontal projection of the centerlines of all crane wheels on the same end carriage. When this difference exceeds 2mm, the direction of movement of each wheel becomes inconsistent—wheels on the same end carriage attempt to travel in different directions, causing the wheel flanges to rub continuously against the side of the crane rail (rail gnawing). This accelerates flange wear and damages the rail side. In extreme cases (alignment difference >5mm), the wheels may even fail to roll properly on the rail (becoming jammed), forcing them to slide along the rail side via the flange, which results in severe running resistance and abnormal wear. During installation, a theodolite or laser alignment device should be used to correct the wheel positions, ensuring that the alignment difference remains within the allowable range specified by the Standard.