On this page 5 sections
Key features of seamless tubes
- Cold-drawn to close tolerances
- No weld line: best for high pressure
- Specs: ASTM A213, A269, B163, B338
- Straight lengths or U-bent
Seamless Tubes by material
Seamless Tubes are available in the following grades. Select a grade for specifications and sizes.
Stainless Steel
- SS 201 Seamless Tubes
- SS 202 Seamless Tubes
- SS 304 Seamless Tubes
- SS 304L Seamless Tubes
- SS 304H Seamless Tubes
- SS 309 Seamless Tubes
- SS 309S Seamless Tubes
- SS 310 Seamless Tubes
- SS 310S Seamless Tubes
- SS 316 Seamless Tubes
- SS 316L Seamless Tubes
- SS 316Ti Seamless Tubes
- SS 317 Seamless Tubes
- SS 317L Seamless Tubes
- SS 321 Seamless Tubes
- SS 321H Seamless Tubes
- SS 347 Seamless Tubes
- SS 347H Seamless Tubes
- SS 409 Seamless Tubes
- SS 430 Seamless Tubes
- SS 441 Seamless Tubes
- SS 446 Seamless Tubes
- SS 904L Seamless Tubes
- Duplex 2205 Seamless Tubes
- Super Duplex 2507 Seamless Tubes
- SS 253 MA Seamless Tubes
- SS 254 SMO Seamless Tubes
Nickel Alloys
- Inconel 600 Seamless Tubes
- Inconel 601 Seamless Tubes
- Inconel 625 Seamless Tubes
- Inconel 718 Seamless Tubes
- Incoloy 800 Seamless Tubes
- Incoloy 800H Seamless Tubes
- Incoloy 800HT Seamless Tubes
- Incoloy 825 Seamless Tubes
- Monel 400 Seamless Tubes
- Hastelloy C22 Seamless Tubes
- Hastelloy C276 Seamless Tubes
- Nickel 200 Seamless Tubes
- Nickel 201 Seamless Tubes
Seamless Tubes: sizes, finishes and testing
- Size range
- OD 3 mm to about 127 mm (¼" to 5") typical, wall 0.5 mm to 12 mm; BWG or mm; straight lengths up to about 30 m, U-bent to drawing
- Finish
- Annealed & pickled, bright annealed (BA), polished (sanitary), cold-drawn
- Ends
- Plain square-cut, deburred; U-bends with stress-relieved bends on request
Testing & documents
- Eddy-current and/or ultrasonic testing on each tube
- Hydrostatic or pneumatic test
- Flattening, flaring and flange tests
- Grain size (H grades), IGC and hardness when specified
- Surface roughness (Ra) for sanitary and instrumentation tube
- EN 10204 3.1 certificate; 3.2 with third-party inspection
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Other tubes types
Frequently asked questions
What sizes are seamless tubes available in?
OD 3 mm to about 127 mm (¼" to 5") typical, wall 0.5 mm to 12 mm; BWG or mm; straight lengths up to about 30 m, U-bent to drawing.
Which specifications cover seamless tubes?
Specs: ASTM A213, A269, B163, B338.
What are seamless tubes used for?
No weld line: best for high pressure. They're specified for boiler, superheater, heat-exchanger, hydraulic and instrumentation service where there must be no weld line.
Which materials are seamless tubes available in?
Stainless steel, nickel alloys, carbon and alloy steel and non-ferrous metals, depending on the specification. See the material list above.