Mandrel Bars
Material: H13 (4Cr5MoSiV1)
Diameter Range: 90mm to 500mm
Length: Up to 18.5 meters
Connecting Thread: Partial Trapezoidal Thread
Process:Forging+Heattreatment+Machining
Application: Tools to produce large-diameter seamless steel pipe
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Product Details ofMandrel Bars
Product Description
Mandrel bars are cylindrical tools typically made of metal, used in various manufacturing processes, especially in metalworking and machining operations. They play a crucial role in shaping and supporting hollow objects during forming processes such as tube rolling, pipe bending, and extrusion.
| Specification |
Tensile strength σb(MPa) |
Yield strength σ0.2(MPa) |
Elongation σ5(MPa) | ψ(%) | AKV(J) | Hardnes(HB) |
| ≤200mm | 1127-1274 | ≥931 | ≥8 | ≥25 | ≥20 | 350-390 |
| ＞200mm | 1078-1274 | ≥882 | ≥8 | ≥25 | ≥20 | 330-375 |
features
The main function of mandrel bars is to provide internal support to the workpiece being formed, ensuring uniformity in shape, thickness, and dimensions. They are inserted inside the hollow workpiece, such as a tube or a pipe, to prevent it from collapsing or deforming during the shaping process. This internal support helps maintain the desired geometry and prevents defects such as wrinkling, buckling, or ovality.
Mandrel bars come in different sizes and materials depending on the specific application and requirements of the manufacturing process. Common materials used for mandrel bars include steel, aluminum, and various alloys chosen for their strength, durability, and thermal resistance.
Application
Mandrel bars find applications across various industries where metalworking and forming processes are prevalent. Some of the key industries where mandrel bars are commonly used include:
1. Steel Manufacturing: In the production of seamless steel tubes and pipes, mandrel bars are crucial for maintaining the integrity and uniformity of the products during the rolling or extrusion process.
2. Automotive: Mandrel bars are employed in the fabrication of exhaust pipes, mufflers, and other tubular components in the automotive industry, ensuring the desired shape and dimensional accuracy.
3. Aerospace: Aerospace manufacturing often involves the shaping of complex, precision-engineered components. Mandrel bars are used in processes such as tube bending and forming for aircraft structures and systems.
4. Construction: Mandrel bars play a role in the production of metal tubes and pipes used in construction applications such as building frameworks, handrails, and plumbing systems.
5. Oil and Gas: In the oil and gas industry, mandrel bars are utilized for forming seamless pipes used in drilling operations, pipelines, and refineries, ensuring the reliability and integrity of the infrastructure.
6. Shipbuilding: Mandrel bars are involved in the fabrication of pipes and tubes used in shipbuilding, providing structural support and dimensional accuracy for various marine applications.
7. Manufacturing and Fabrication: Mandrel bars are also utilized in general metalworking and fabrication processes across a wide range of industries, including manufacturing of industrial equipment, machinery, and consumer goods.
Overall, mandrel bars are versatile tools with applications in industries where precision forming and shaping of metal components are essential.
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