1. High-Quality Raw Materials Our raw materials are primarily sourced from renowned steel mills such as Jiangsu BOS Hydraulic Technology Co., Ltd., Baosteel, Ansteel, and Changjiang Steel Pipe.
2. Advanced Production Equipment Our manufacturing facilities include cold drawing machines, honing machines, skiving and roller burnishing machines, straightening equipment,polishing machines, heat treatment furnaces, grinding machines, and more.
3. Rich production experience, strict quality control We implement a professional internal quality control system to conduct comprehensive inspections on all products.
In demanding industrial applications such as heavy metallurgical equipment, 10,000-ton hydraulic presses, gate opening and closing systems for giant hydropower stations, steering gear for large ships, and mining machinery, conventional hydraulic cylinders or structural components often fall short. These behemoths must withstand thousands of tons of pressure, achieve ultra-long travels of several meters or even more than ten meters, and ensure smooth, precise, and reliable movement. Large-diameter honed tubes are the backbone and blood vessels supporting the strength and precision of these "industrial giants."
Large-diameter honed tubes are large-diameter steel tubes that have undergone a precision honing process. Generally speaking, large-diameter tubes refer to those with an outer diameter greater than 100mm. Honing is a finishing process that involves using abrasive polishing stones and sandpaper to remove a small amount of material to achieve extremely precise inner diameter dimensions and an improved surface finish. This treatment ensures that large-diameter honed tubes achieve extremely high dimensional accuracy and extremely low surface roughness, typically achieving Ra values of 0.2-0.4μm. These properties make them particularly suitable for critical components in hydraulic cylinders, precision guide systems, and various industrial machinery.
The manufacturing of large-diameter honed tubes is a multi-stage precision engineering process. The raw material, typically high-quality carbon steel or low-alloy steel, is formed into tube blanks through hot rolling or cold drawing. The production process for large-diameter seamless steel tubes primarily involves hot rolling or hot expansion. Hot-expanded seamless steel tubes are available in sizes ranging from 325mm to 1220mm, with a maximum thickness of 200mm.
Honing is a key step in ensuring the dimensional accuracy and surface finish of the tube’s inner wall. This process requires specialized techniques and high-precision equipment. Through grinding and polishing, material is removed to achieve the required surface quality and dimensional accuracy. For large-diameter tubes, the honing process requires higher technical requirements and longer processing time to ensure the inner wall’s straightness and roundness.
After manufacturing, large diameter honed tubes typically require various heat and surface treatments to improve their mechanical properties and corrosion resistance. These treatments may include heat treatment processes such as normalizing, quenching, and tempering, as well as surface treatments such as chrome plating, phosphating, or coating.
Large diameter honed tubes combine several excellent properties:
High Precision and Smooth Surface: The honing process ensures the accuracy of the tube’s internal dimensions and surface finish, with a surface roughness of up to 0.2-0.4μm. This reduces friction loss and seal wear, ensuring sealing performance and movement accuracy.
Excellent Mechanical Properties: Large diameter, thick-walled seamless tubes can withstand high pressure and shock loads and exhibit excellent mechanical properties. They exhibit excellent mechanical properties such as tensile strength, yield point, and elongation.
Excellent Corrosion Resistance: Through the selection of appropriate materials and surface treatments, large diameter honed tubes are resistant to various corrosive media and are suitable for operation in harsh environments.
High Strength and Rigidity: The thick-wall design provides exceptional structural strength and deformation resistance, capable of withstanding extremely high internal pressures and external loads.
Easy Installation: The seamless manufacturing process makes it easy to process and install, significantly accelerating project schedules.
Hydraulic Systems: As the primary material for large hydraulic cylinder bodies, it is widely used in construction machinery, mining equipment, and pressure machinery. Its precise inner diameter and smooth surface ensure the reliability and efficiency of hydraulic systems.
Industrial Machinery: It serves as a key structural component and guide element in industrial equipment such as injection molding machines and die-casting machines, providing stable support and precise guidance.
Energy Equipment: It is used in key pipe fittings in oil drilling equipment, wind power hydraulic systems, and nuclear power equipment, leveraging its high-pressure and corrosion-resistant properties.
Chemical Industry: It can withstand the transport of various corrosive media and is widely used in the chemical, pharmaceutical, and other industries.
Construction Industry: It is used in thermal systems and heating systems in construction projects.
The production of large-diameter honed tubes presents several technical challenges:
Large-diameter structures are prone to internal stress and deformation during machining, requiring specialized heat treatment processes to eliminate stress and improve dimensional stability. Honing processes for large-diameter tubes require longer processing times and higher technical requirements to ensure the straightness and roundness of the inner wall.
To address these challenges, manufacturers have developed a variety of innovative solutions, such as ultrasonic-assisted machining to improve inner surface quality and heat treatment processes specifically designed for large-diameter tubes to ensure uniform and stable material properties.
Quality control for large-diameter honed tubes involves multiple aspects:
Dimensional accuracy control includes parameters such as inner diameter tolerance, wall thickness uniformity, straightness, and roundness. Large-diameter tubes typically require an inner bore accuracy of H5-H10 and a straightness of ≤0.3mm/m.
Surface quality inspection includes surface roughness measurement, coating thickness testing, and porosity inspection. The surface treatment layer must be uniform and continuous, free of defects such as cracks and flaking. Mechanical property testing includes hardness testing, compressive strength testing, and pressure resistance testing to ensure that the tubes can withstand the designed operating pressure and environmental stresses.
Material Innovation: Developing material systems with higher strength and improved toughness, such as high-strength alloy steels and specialty steels, to further optimize tube performance.
Process Optimization: Improving honing and surface treatment processes to increase production efficiency and product consistency, while reducing production costs.
Intelligent Manufacturing: Introducing automated and intelligent manufacturing processes to improve product consistency and quality stability.
Customized Solutions: Developing large-diameter honed tube products optimized for specific applications to meet individual needs.
Environmentally Friendly Technologies: Utilizing more environmentally friendly surface treatment processes to reduce environmental impact.
Large-diameter honed tubes are far more than simply enlarged versions of ordinary steel pipes. A culmination of materials science, precision manufacturing processes (especially honing), and engineering design, these components are the core load-bearing and precision motion components that support heavy-load, high-pressure, and ultra-long-stroke industrial giants. Their inherent quality directly determines the performance limits, operational reliability, service life, and maintenance costs of the entire equipment.
In the design and manufacture of large-scale, critical equipment, choosing a supplier of large-diameter honing tubes with extensive experience and strong technical capabilities means choosing the solid and reliable “bones” and efficient and smooth “vessels” of your “industrial giant.” This is a strategic investment that ensures stable equipment operation, maximizes performance, and creates lasting value.
