Cold Drawn Seamless Tube
1. Definition
A cold-drawn seamless tube is a cylindrical product that is manufactured by drawing a solid metal billet through a piercing rod to create a hollow tube without any seams or welds. This seamless construction sets them apart from other types of tubes, such as welded or hot-rolled tubes. The absence of seams enhances the tube’s structural integrity and resistance to various stresses, making it an ideal choice for critical applications.
2. Dimension
| Outer Diameter | 3.2-177.8 mm |
| Wall Thickness | 2.2-25.4 mm |
| Length | SRL, DRL or according to customer's requirement |
3. Production Process
Billet Preparation→Heating→Piercing→Elongation→Cold Drawing→Heat Treatment (Optional)→Surface Treatment
4. Application
| Oil and Gas Industry | Pipelines: Cold drawn seamless tubes are used for transporting oil and gas over long distances due to their high strength and resistance to pressure. |
| Downhole Tubing: These tubes are critical in drilling operations, providing structural integrity in high-pressure and high-temperature environments. | |
| Power Generation | Boilers: Used in the manufacturing of boiler tubes that operate under high pressure and temperature, ensuring efficient heat transfer. |
| Heat Exchangers: Employed in heat exchangers to transfer heat between fluids while maintaining structural integrity under thermal stress. | |
| Automotive Industry | Hydraulic Systems: Cold drawn seamless tubes are often used in hydraulic cylinders and components, providing reliable performance in demanding conditions. |
| Chassis Components: They are used in various structural components of vehicles due to their strength and lightweight properties. | |
| Aerospace Industry | Aircraft Components: Used in manufacturing critical components of aircraft, such as landing gear and fuel lines, where high strength-to-weight ratios and reliability are essential. |
| Engine Parts: Employed in the production of engine components that require precise dimensions and excellent mechanical properties. | |
| Construction and Structural Applications | Support Structures: Cold drawn seamless tubes are used in scaffolding, support columns, and other structural applications where strength and durability are paramount. |
| Frameworks: Utilized in various construction frameworks, providing robust support for buildings and infrastructure. | |
| Medical Equipment | Surgical Instruments: These tubes are used in high-precision medical instruments due to their sterile finish and mechanical reliability. |
| Implants and Prosthetics: Employed in manufacturing implants and prosthetic devices that require biocompatibility and strength. | |
| Chemical and Petrochemical Industries | Pressure Vessels: Used in the construction of pressure vessels that store and transport chemicals under high pressure. |
| Piping Systems: Employed in piping systems for transporting corrosive materials, often treated for enhanced corrosion resistance. |
5. Material, Standard, Grade and Corresponding Characteristics
| Material | Standard & Grade | Characteristics |
| Carbon Steel | ASTM A106: Grades A, B, and C | Good strength and weldability, commonly used in pressure applications. |
| ASTM A179: Specifically for low-temperature applications | ||
| ASTM A192: For high-temperature and pressure applications | ||
| Alloy Steel | ASTM A335: P1, P5, P9, P11, P22, P91 (for high-temperature service) | Enhanced strength and toughness, suitable for high-stress applications, often used in power generation and petrochemical industries. |
| ASTM A213: T5, T9, T11, T22, T91 (for various high-temperature applications) | ||
| Stainless Steel | ASTM A312: TP304, TP316, TP321 (for high-temperature and corrosive environments) | Excellent corrosion resistance, suitable for chemical processing, food, and pharmaceutical industries. |
| ASTM A213: T304, T316 (for high-temperature applications) | ||
| Nickel Alloys | ASTM B163: Nickel 200, Nickel 201 | High resistance to heat and corrosion, ideal for extreme environments in chemical processing and aerospace applications. |
| ASTM B167: Inconel 600, Inconel 625 | ||
| Copper and Copper Alloys | ASTM B280: Copper tubes for air conditioning and refrigeration | Good thermal and electrical conductivity, commonly used in plumbing and HVAC applications. |
| ASTM B75: Copper-nickel alloys (e.g., C70600) |
6. Packaging & Delivery
| Packaging Method | Description | Benefit |
| Wooden Crates | Tubes are often packed in sturdy wooden crates that provide robust protection against physical damage during transit. | This method is suitable for large quantities and heavy-duty applications, preventing bending or deformation. |
| Steel Bundles | Tubes may be bundled together using steel straps or wire, ensuring they remain securely in place during transportation. | This method allows for efficient handling and maximizes space during shipping. |
| Plastic Wrapping | Individual tubes or bundles are wrapped in plastic film to shield them from moisture, dust, and contaminants. | Protects the surface finish and prevents corrosion during storage and transport. |
| Cardboard Boxes | Smaller quantities of tubes can be packaged in cardboard boxes, providing lightweight protection. | Ideal for easy handling and shipping, especially for less fragile items. |
| End Caps | Protective end caps are placed on the ends of the tubes to prevent damage during handling and transport. | Maintains the integrity of the tube openings and prevents contamination. |
| Pallets | Tubes can be stacked on wooden or plastic pallets for easier handling with forklifts and for organized storage. | Facilitates efficient loading and unloading processes. |
| Transportation Method | Description | Benefit |
| Road Transport | Trucks are commonly used for transporting cold drawn seamless tubes over short to medium distances. | Flexible and efficient for local deliveries and can navigate various terrains. |
| Rail Transport | Trains are utilized for long-distance transportation, especially for bulk shipments. | Cost-effective for large volumes and reduces road congestion. |
| Sea Freight | Containers are used to ship tubes internationally by sea, often combining them with other goods. | Economical for large shipments over long distances, although transit times are longer. |
| Air Freight | For urgent shipments, air freight can be used to transport tubes quickly to their destination. | Fastest transportation method, though more expensive and typically used for smaller quantities. |
