Table of Contents
- Introduction
- What Are Seamless Tubes?
- Seamless Tube Sizes Chart 2025
- Common Standards for Seamless Tube Sizes
- Applications of Seamless Tubes
- How to Select the Right Seamless Tube Sizes
- Summary Table: Key Seamless Tube Dimensions
- Company Spotlight: Toko Technology Co., Ltd.
- FAQs About Seamless Tube Sizes
- References
Introduction
Choosing the right seamless tube sizes is critical for any engineering or industrial project. In 2025, industries continue to demand tighter tolerances, improved corrosion resistance, and global standardization in seamless tube sizes. This comprehensive guide presents the updated Seamless Tube Sizes Chart 2025 with dimensions, wall thicknesses, and specifications according to major standards such as ASTM, DIN, EN, and JIS.
What Are Seamless Tubes?
Seamless tubes are cylindrical metal pipes without any welded joints. They are manufactured through extrusion or rotary piercing, ensuring uniform strength and superior corrosion resistance. Compared with welded tubes, seamless tube sizes maintain consistent mechanical integrity under high pressure and temperature conditions.
Benefits of Seamless Tubes
- No weld seams — resulting in higher pressure tolerance.
- Superior performance in extreme temperatures.
- Enhanced corrosion and oxidation resistance.
- Uniform wall thickness and better dimensional accuracy.
Seamless Tube Sizes Chart 2025
Below is a quick reference table for standard seamless tube sizes used in global industries. These cover stainless steel, carbon steel, and nickel alloy tubes commonly produced according to ASTM and EN standards.
| Outside Diameter (OD) | Wall Thickness (WT) | Approx. Weight (kg/m) | Standard |
|---|---|---|---|
| 6 mm | 1 mm | 0.13 | ASTM A213 |
| 10 mm | 1 mm | 0.21 | ASTM A312 |
| 12.7 mm (½”) | 1.24 mm | 0.27 | EN 10216 |
| 25.4 mm (1”) | 2.11 mm | 0.97 | ASTM A269 |
| 50.8 mm (2”) | 2.77 mm | 2.67 | ASTM A213 / JIS G3459 |
| 76.2 mm (3”) | 3.05 mm | 4.70 | DIN 17458 |
| 101.6 mm (4”) | 3.68 mm | 7.20 | ASTM A312 TP304/316 |
| 152.4 mm (6”) | 4.78 mm | 14.50 | EN 10216-5 |
This seamless tube sizes chart serves as a universal reference for engineers, designers, and procurement teams working with stainless steel seamless tubes in 2025.
Common Standards for Seamless Tube Sizes
Standardization ensures consistency and interchangeability of seamless tube sizes across global supply chains. The major international standards include:
- ASTM A213: Heat exchanger and boiler seamless tubes.
- ASTM A269: Stainless steel seamless and welded tubing for general service.
- EN 10216-5: Seamless steel tubes for pressure purposes.
- JIS G3459: Stainless steel pipes used in chemical industries.
- DIN 17458: Austenitic stainless steel tubes, seamless.
Applications of Seamless Tubes
The versatility of seamless tube sizes makes them suitable for numerous sectors:
1. Oil and Gas Industry
Used in drilling, offshore pipelines, and refinery systems where high pressure and corrosion resistance are essential.
2. Chemical and Petrochemical
Seamless tubes are vital for transporting corrosive fluids, ensuring leak-proof performance.
3. Power Generation
Applied in heat exchangers and boilers due to high thermal strength and consistent seamless tube sizes.
4. Automotive and Aerospace
Preferred for lightweight, durable, and high-precision components.
5. Water Treatment & Desalination
Seamless stainless steel tubes resist corrosion even in saline environments.
How to Select the Right Seamless Tube Sizes
Choosing the right seamless tube sizes involves considering both functional and environmental factors:
1. Pressure and Temperature Requirements
Ensure the wall thickness and grade support your operating pressures and temperatures.
2. Material Compatibility
Select from stainless steel, nickel alloy, or titanium depending on the fluid medium and corrosion level.
3. Manufacturing Tolerances
Precision tolerances ensure the correct fit, minimizing stress and leaks in assembly.
4. Standards Compliance
Always verify seamless tube sizes conform to ASTM, EN, or JIS standards for safety and performance.
Summary Table: Key Seamless Tube Dimensions
| Material Type | Diameter Range | Wall Thickness Range | Applications |
|---|---|---|---|
| Stainless Steel | 6mm – 610mm | 0.5mm – 40mm | Oil, Gas, Chemical |
| Carbon Steel | 13mm – 660mm | 1mm – 70mm | Boilers, Construction |
| Nickel Alloy | 6mm – 273mm | 0.5mm – 30mm | Chemical, Aerospace |
| Titanium | 10mm – 219mm | 0.8mm – 12mm | Marine, Desalination |
Company Spotlight: Toko Technology Co., Ltd.
About Toko Technology Co., Ltd.
Shanghai Toko Technology Co., Ltd. is a trusted leader in the industrial piping field, operating for over 11 years from its base in Shanghai, China. The company manufactures and exports stainless steel seamless pipes, welded pipes, fittings, flanges, nickel alloy products, and titanium seamless and welded tubes.
Certifications and Quality
Toko Technology’s factories are ISO & PED certified. Their products meet ASTM, JIS, DIN, EN, and GOST standards, ensuring consistent seamless tube sizes that meet global specifications. Their tubes are widely used in industries such as Oil & Gas, Petrochemical, Sugar Refining, Water Process, and Geothermal Energy.
Product Range
Export Markets
The company exports to the USA, Canada, Japan, Germany, France, Korea, and Turkey, among others — delivering precision-engineered seamless tube sizes to clients around the world.
FAQs About Seamless Tube Sizes
1. What are the standard seamless tube sizes available in 2025?
Common sizes range from 6mm to 610mm in outer diameter, with wall thicknesses from 0.5mm to 40mm, depending on the application and material.
2. How are seamless tube sizes measured?
They are typically measured by outer diameter (OD), wall thickness (WT), and length. Some standards also reference inner diameter (ID).
3. Which industries use seamless tubes most frequently?
Oil and gas, petrochemical, power generation, automotive, and desalination industries rely heavily on standard seamless tube sizes.
4. What are the differences between seamless and welded tubes?
Seamless tubes are extruded without welding, offering superior pressure resistance, while welded tubes are more cost-efficient for lighter applications.
5. Does Toko Technology offer custom seamless tube sizes?
Yes, Toko Technology Co., Ltd. provides OEM and customized manufacturing to meet specific project requirements in seamless tube production.
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