Tube forged products are cylindrical or hollow cylindrical metal components manufactured through forging processes. Tube forged products play a key role in various mechanical equipment, serving multiple functions such as housing, support, and power transmission. Their quality and performance significantly impact the overall operational effectiveness of the equipment.
Materials
1. Carbon steels such as low carbon steel (e.g., Q235), medium carbon steel (e.g., 45 steel), high carbon steel (e.g., T8)
2. Alloy structural steels such as low alloy steel (e.g., Q345), medium alloy steel (e.g., 42CrMo), high alloy steel (e.g., 30CrMnSiA)
3. Stainless steels such as austenitic stainless steel (e.g., 304), martensitic stainless steel (e.g., 410)
4. Special alloys such as heat-resistant steel (e.g., Cr25Ni20), wear-resistant steel (e.g., NM360)
5. Cast irons such as gray cast iron (e.g., HT200), ductile cast iron (e.g., QT400-18)
Tube Classification
1. Classification by use
- Pressure vessel tubes: used to store gases or liquids and withstand certain pressures.
- Mechanical transmission tubes: such as reducer tubes, winch tubes, used to transmit torque and motion.
- Other tubes: such as hydraulic cylinder tubes, pneumatic cylinder tubes, used to achieve specific functions.
2. Classification by structural characteristics
- Integral tubes: forged from a single piece of material, compact structure, higher strength.
- Segmented tubes: assembled from multiple tube segments, facilitating manufacturing and installation, suitable for large tubes.
Process Introduction
1. Cutting and heating: saw steel ingots, heat to 1100~1300°C (adjusted according to material).
2. Preform:
- Open-die forging: upsetting → punching → mandrel expanding → shaping.
- Closed-die forging: upsetting → pre-forging → final forging → trimming.
- Ring rolling: upsetting → punching → ring rolling → controlled cooling.
- Heat treatment: normalizing/tempering to optimize microstructure and properties.
- Inspection and machining: UT flaw detection → rough turning → fine grinding to finished product.
Application Scope
1. Petrochemical: hydroprocessing reactors, synthesis towers, high-pressure pipelines.
2. Energy and power: steam turbine cylinders, nuclear power pressure vessels.
3. Aerospace: engine casings, rocket fuel tanks.
4. Military and shipbuilding: gun barrels, submarine pressure hulls.
5. General machinery: hydraulic cylinders, bearing housings, large flanges.
Working Principle
The working principle of tube forged products mainly depends on their specific application scenarios. For example, pressure vessel tubes store gases or liquids by withstanding internal pressure; mechanical transmission tubes transmit torque and motion through cooperation with gears, shafts, and other components; hydraulic cylinder tubes use hydraulic oil pressure to drive piston movement, achieving mechanical actions.
Keywords
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Next： Ring forging
Tube Forging
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