Seamless Pipe — ASME B36.19
Seamless pipe — pipe made without a weld seam, by piercing and drawing. Seamless pipe is the choice for high pressure, high temperature and critical service where a weld seam is not wanted.
- ASME B36.19
- 22 grades
- EN 10204 3.1 / 3.2
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is a seamless pipe?
A seamless pipe is pipe made without a weld seam, by piercing and drawing. Seamless pipe is the choice for high pressure, high temperature and critical service where a weld seam is not wanted.
Standards for seamless pipes
| Dimensions | ASME B36.19 · B36.10 |
|---|---|
| Material — stainless | ASTM A312 · tube ASTM A269 / ASTM A213 |
| Material — duplex | ASTM A790 · tube ASTM A789 |
| Material — nickel alloys | ASTM B423 (825) · ASTM B444 (625) · ASTM B622 (C276) |
| Material — carbon & Cr-Mo | ASTM A106 · ASTM A333 · ASTM A335 |
| Certificate | EN 10204 3.1, or 3.2 with third-party inspection |
Seamless Pipe: What to Know Before Ordering
- No weld seam
- NPS ⅛" – 24"
- Schedules 5S – XXS
Seamless Pipe Materials & Grades
| Grade | Material standard | Best for |
|---|---|---|
| Inconel 825 seamless pipe | ASTM B423 | Sulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas |
| SS 904L seamless pipe | ASTM A312 (N08904) | Dilute sulphuric acid, phosphoric acid and chloride-bearing cooling water |
| SS 304 seamless pipe | ASTM A312 TP304 | General corrosion resistance, food, water and architectural work |
| SS 304L seamless pipe | ASTM A312 TP304L | Welded tanks, piping and vessels in general corrosive service |
| SS 310 / 310S seamless pipe | ASTM A312 TP310S | Furnaces, burners and heat treatment at high temperature |
| SS 316 / 316L seamless pipe | ASTM A312 TP316L | Chloride-bearing process fluids, marine air and pharmaceutical service |
| SS 321 seamless pipe | ASTM A312 TP321 | High-temperature service between 425 and 815 °C |
| SS 347 seamless pipe | ASTM A312 TP347 | Welded high-temperature piping in refineries and power plants |
| Duplex 2205 seamless pipe | ASTM A790 | Strength with chloride resistance at a stainless-steel budget |
| Super Duplex 2507 seamless pipe | ASTM A790 | Seawater and high-chloride service where strength also matters |
| Inconel 600 seamless pipe | ASTM B167 | High-temperature oxidation, caustic and nuclear service |
| Inconel 625 seamless pipe | ASTM B444 | Seawater, high strength and high temperature in one alloy |
| Inconel 718 seamless pipe | a specification not yet established | Very high strength at temperatures up to about 650 °C |
| Incoloy 800 / 800H / 800HT seamless pipe | ASTM B407 | Furnaces, petrochemical heaters and high-temperature piping |
| Hastelloy C276 seamless pipe | ASTM B622 | The most aggressive mixed acids, wet chlorine and hypochlorite |
| Hastelloy C22 seamless pipe | ASTM B622 | Mixed oxidising and reducing acids, and weld overlays |
| Monel 400 seamless pipe | ASTM B165 | Seawater, hydrofluoric acid and marine service |
| Super Duplex S32760 seamless pipe | ASTM A790 | Seawater firewater, injection and offshore piping |
| ASTM A106 Gr B seamless pipe | ASTM A106 Gr B | High-temperature process and steam piping in refineries and power plants |
| ASTM A333 Gr 6 seamless pipe | ASTM A333 Gr 6 | Cold-climate and refrigerated piping down to −45 °C |
| ASTM A335 P11 seamless pipe | ASTM A335 P11 | Steam and hot-oil piping up to about 550 °C |
| ASTM A335 P22 seamless pipe | ASTM A335 P22 | High-pressure steam and hydrogen service up to about 580 °C |
Seamless pipe — questions buyers ask
What is a seamless pipe?
A seamless pipe is pipe made without a weld seam, by piercing and drawing. Seamless pipe is the choice for high pressure, high temperature and critical service where a weld seam is not wanted.
Why choose seamless over welded pipe?
No longitudinal weld means uniform strength and corrosion resistance — preferred for pressure and critical service.
Which grades are seamless pipes available in?
Inconel 825, SS 904L, SS 304, SS 304L, SS 310 / 310S, SS 316 / 316L, SS 321, SS 347, Duplex 2205, Super Duplex 2507, Inconel 600, Inconel 625, Inconel 718, Incoloy 800 / 800H / 800HT, Hastelloy C276, Hastelloy C22, Monel 400, Super Duplex S32760, ASTM A106 Gr B, ASTM A333 Gr 6, ASTM A335 P11, ASTM A335 P22.
Which standard covers seamless pipe dimensions?
ASME B36.19 · B36.10. The material standard depends on the grade.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026