Welded Pipe — ASME B36.19
Welded pipe — pipe formed from plate or strip and welded along its length. Welded (ERW / EFW) pipe is economical in larger diameters and thinner walls, and accepted by most codes with the right testing.
- ASME B36.19
- 19 grades
- EN 10204 3.1 / 3.2
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is a welded pipe?
A welded pipe is pipe formed from plate or strip and welded along its length. Welded (ERW / EFW) pipe is economical in larger diameters and thinner walls, and accepted by most codes with the right testing.
Standards for welded 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 |
Welded Pipe: What to Know Before Ordering
- ERW and EFW
- Larger diameters available
- Weld bead removed or flush
Welded Pipe Materials & Grades
| Grade | Material standard | Best for |
|---|---|---|
| Inconel 825 welded pipe | ASTM B705 | Sulphuric and phosphoric acid service, chloride stress-corrosion cracking and sour gas |
| SS 904L welded pipe | ASTM A312 (N08904) | Dilute sulphuric acid, phosphoric acid and chloride-bearing cooling water |
| SS 304 welded pipe | ASTM A312 · A358 | General corrosion resistance, food, water and architectural work |
| SS 304L welded pipe | ASTM A312 · A358 | Welded tanks, piping and vessels in general corrosive service |
| SS 310 / 310S welded pipe | ASTM A312 · A358 | Furnaces, burners and heat treatment at high temperature |
| SS 316 / 316L welded pipe | ASTM A312 · A358 | Chloride-bearing process fluids, marine air and pharmaceutical service |
| SS 321 welded pipe | ASTM A312 · A358 | High-temperature service between 425 and 815 °C |
| SS 347 welded pipe | ASTM A312 · A358 | Welded high-temperature piping in refineries and power plants |
| Duplex 2205 welded pipe | ASTM A790 · A928 | Strength with chloride resistance at a stainless-steel budget |
| Super Duplex 2507 welded pipe | ASTM A790 · A928 | Seawater and high-chloride service where strength also matters |
| Inconel 600 welded pipe | ASTM B517 | High-temperature oxidation, caustic and nuclear service |
| Inconel 625 welded pipe | ASTM B705 | Seawater, high strength and high temperature in one alloy |
| Inconel 718 welded pipe | a specification not yet established | Very high strength at temperatures up to about 650 °C |
| Incoloy 800 / 800H / 800HT welded pipe | ASTM B514 | Furnaces, petrochemical heaters and high-temperature piping |
| Hastelloy C276 welded pipe | ASTM B619 | The most aggressive mixed acids, wet chlorine and hypochlorite |
| Hastelloy C22 welded pipe | ASTM B619 | Mixed oxidising and reducing acids, and weld overlays |
| Monel 400 welded pipe | ASTM B725 | Seawater, hydrofluoric acid and marine service |
| Super Duplex S32760 welded pipe | ASTM A790 · A928 | Seawater firewater, injection and offshore piping |
| ASTM A333 Gr 6 welded pipe | ASTM A333 Gr 6 | Cold-climate and refrigerated piping down to −45 °C |
Welded pipe — questions buyers ask
What is a welded pipe?
A welded pipe is pipe formed from plate or strip and welded along its length. Welded (ERW / EFW) pipe is economical in larger diameters and thinner walls, and accepted by most codes with the right testing.
Is welded pipe accepted in pressure piping?
Yes, under ASME B31.3 with the weld joint factor for the specification and testing performed.
Which grades are welded 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 A333 Gr 6.
Which standard covers welded 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