Common Material Grades
Medium-Carbon Steel: Grade 45 steel is the most commonly used material for hydraulic cylinder barrels and is typically quenched and tempered to a hardness of 241–285 HB.
Alloy Steel: Grades such as 20Cr and 35CrMo are used for applications requiring higher strength or meeting special requirements.
Others: 20 steel and 35 steel are used for welded structural components; aluminum alloys and other materials may also be used in special applications.
Typical Size Range
Inner Diameter: The common machining range extends from tens of millimeters to 500 mm, and even larger sizes are common.
Length: There are machining cases ranging from relatively short cylinder bodies to ultra-long hydraulic cylinders as long as 18,000 mm (18 meters).
Precision Grades: Inner diameter tolerances are generally required to meet H8 to H9 grades, with some high-precision applications reaching H7 or even H6.
Main Application Areas
Construction Machinery and Hydraulic Systems: Various types of hydraulic cylinders, rock drill cylinder bodies, etc.—this is the primary application area.
Oilfield Equipment: High-precision hydraulic and pneumatic cylinder barrels.
Automotive Industry: Forged cylinder blocks for high-performance engines.
We also provide forging blanks and CNC precision machining services for our clients, covering industries such as energy, petrochemicals, steel, engineering machinery, plastics, prevention and control, hydraulics, healthcare, and food. Please feel free to send us drawings for inquiries.
Metalworking Services
CNC Machining
Sheet Metal Fabrication
Metal Welding
Metal Cutting
Metal Bending
Metal Punching
Metal Forging
Metal Sheet Rolling
Tube and Plate Drilling
Our heavy-duty forging presses support open-die forging and deformation of large-section forgings, including discs, shafts, blocks, and custom components. This capability enables us to meet the demanding forming requirements of heavy industrial applications.
Heat treatment is a critical step in achieving the mechanical properties required for heavy-duty forgings. Our process capabilities meet the strength, toughness, and structural stability requirements for forged components used under demanding operating conditions.
We offer machining capabilities for large forged shafts and long cylindrical components, supporting both rough and finish machining. This capacity is suitable for stepped shafts, rotor shafts, rollers, and other heavy-duty forged shaft components.
Our machining facilities are capable of handling large ring-shaped forgings and circular parts that require precise turning, face machining, boring, and contour control. This capability is suitable for industrial ring blanks, heavy-duty circular parts, and machined ring forgings.
We offer machining solutions for heavy-duty cylindrical, hollow, and tubular forgings. This capability supports the machining of sleeves, cylinders, and other thick-walled forged components used in pressure vessels, rotating systems, and general industrial applications.
Quality control is integrated into our production process through the inspection and testing of forged and machined parts. Our capabilities help verify the dimensional accuracy, condition, and quality consistency of industrial forgings prior to delivery.
Finished forgings are properly protected and packaged to minimize the risk of damage during storage and transportation. Our packaging methods ensure the safe domestic delivery and export shipment of machined and high-value forged components.
