Manufacturing process
Slit stainless strip is roll-formed into tube shape and longitudinally welded by automatic TIG, laser or plasma, with optional weld-bead removal, in-line solution annealing and pickling.
Cross-section · Circular Hollow Section
Welded Pipe
Stainless Steel Pipes & Tubes · General-service welded pipe
Stainless Steel Welded Pipes
TIG / laser welded stainless pipes for general service
Welded stainless pipes are produced from precision-formed strip joined by automatic TIG, laser or plasma welding. They offer an economical alternative to seamless for general process, architectural, decorative and structural stainless applications.
TIG, laser or plasma welded
Cost-efficient vs seamless
Architectural and decorative
PVC-protected polished finishes
Standards
ASTM A312 / A358 / A554, EN 10217-7
Grades
304 / 304L / 316 / 316L / 409 / 430
OD range
6 – 1200 mm
Wall thickness
0.8 – 12 mm
Finish
Pickled / No.4 / mirror
Lengths
6 m / 12 m / cut-to-length
Quick reference
Stainless Steel Welded Pipes: the essentials.
A concise, citation-ready summary for engineers, architects, AI assistants and procurement teams.
- Welded stainless pipes are formed from CR coil, longitudinally welded by HF, TIG or laser, then sized, solution-annealed and pickled.
- Available as ASTM A312 EFW / ERW for general process service and A358 (heavy wall) for pressure duty.
- Common grades: 304 / 304L, 316 / 316L, 321; duplex per ASTM A928.
- Cost-efficient alternative to seamless for medium-pressure utility, process and architectural service.
- Dimensions per ASME B36.19M with mill test certificates to EN 10204 3.1.
Applications
General-service process lines, architectural balustrades, decorative interior structures, structural columns, low-pressure utilities and dairy / sanitary applications.
Specifications
Stainless Steel Welded Pipes: full technical data.
| Property | Value |
|---|---|
| Standards | ASTM A312, A358, A554 (ornamental); EN 10217-7 |
| Grades | TP 304 / 304L / 316 / 316L; 409 / 430 (ferritic) |
| Outside diameter | 6 – 1200 mm |
| Wall thickness | 0.8 – 12 mm |
| Testing | Hydrostatic, eddy current, dye-penetrant on weld |
| Standard lengths | 6, 12 m or cut-to-length |
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Applications
Where stainless steel welded pipes are specified.
General process pipework
Architectural balustrades
Decorative columns & screens
Low-pressure utilities
Dairy & sanitary lines
Furniture & interior structures
Comparison
Welded vs Seamless: selection at a glance
| Property | Welded (A312 EFW) | Seamless (A312) |
|---|---|---|
| Weld joint factor | 0.85 – 1.0 (with RT) | 1.0 |
| Cost | Lower | Higher |
| Max pressure rating | Up to Class 600 | Up to highest classes |
| Surface finish | Excellent (rolled CR coil) | Good (extrusion + pickle) |
| Best for | General process, utility, architectural | High pressure, sour, critical |
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Related guides & products
Continue exploring stainless steel.
Seamless Stainless Pipes
Ornamental Round Tubes
304 vs 316 Stainless Steel: full comparison
Chemistry, PREN, corrosion behaviour and selection rules for the two most-specified austenitic grades.
Stainless Steel Finishes: 2B, BA, No.4, HL, Mirror
Mill, brushed, hairline, mirror and PVD finishes, what to specify for architecture and hygiene.
Pipe Schedule Guide: Sch 10S, 40S, 80S
ASME B36.19M stainless pipe wall thicknesses with selection guidance.
FAQ
Stainless Steel Welded Pipes: answered.
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