SS 304L Seamless PipeASTM A312 · ASME B36.19 · Manufacturer, stockist & exporter, India
AISI 304L · UNS S30403
An SS 304L seamless pipe is pipe made without a weld seam, by piercing and drawing, made from SS 304L to ASTM A312 TP304L. Seamless pipe is the choice for high pressure, high temperature and critical service where a weld seam is not wanted.
- ASTM A312
- ASME B36.19
- EN 10204 3.1 / 3.2
- Export packing
Reviewed by the Kanak Steel & Engineering Co. technical team · Updated October 2026
What is an SS 304L Seamless Pipe?
- What it is
- Pipe made without a weld seam, by piercing and drawing
- Material
- ASTM A312 TP304L
- Dimensions
- ASME B36.19 · B36.10
- Grade
- SS 304L · UNS S30403
- Best at
- Welded tanks, piping and vessels in general corrosive service
SS 304L Seamless Pipe Specification
| Product | SS 304L Seamless Pipe |
|---|---|
| Material standard | ASTM A312 TP304L |
| Dimensional standard | ASME B36.19 · B36.10 |
| Sizes | NPS ⅛" – 24", Sch 5S – XXS |
| Length | Random, double random or cut lengths |
| Testing | PMI · dimensional · NDT and IGC on request |
| Documents | EN 10204 3.1 · 3.2 with third-party inspection |
When to Choose a Seamless Pipe
Seamless pipe is the choice for high pressure, high temperature and critical service where a weld seam is not wanted.
- No weld seam
- NPS ⅛" – 24"
- Schedules 5S – XXS
More on choosing: Seamless pipe guide.
SS 304L Seamless Pipe: Why 304L for seamless pipes
Seamless pipe is the choice for high pressure, high temperature and critical service where a weld seam is not wanted. In SS 304L, the choice usually comes down to the medium and temperature — the rows here are the points buyers check for this exact combination.
| Why this grade | Stainless tubulars are the default for corrosive and hygienic service. SS 304L is picked for welded tanks, piping and vessels in general corrosive service. |
|---|---|
| Typical service | Process piping — Welded lines in chemical and pharma plants. |
| Welding to carbon steel | ER309L (or E309L electrode) is the usual filler when joining it to carbon steel |
| Matching filler | ER308L (AWS A5.9) |
SS 304L Seamless Pipe Chemical Composition
Under technical review for TDS.
| Element | Current requirement |
|---|---|
| Chromium | As specified |
| Nickel | As specified |
| Carbon | As specified |
| Manganese | As specified |
| Silicon | As specified |
| Nitrogen | As specified |
| Phosphorus | As specified |
| Sulphur | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification to be verified: ASTM A240 for UNS S30403.
SS 304L Seamless Pipe Mechanical Properties
Under technical review for TDS.
| Property | Current requirement |
|---|---|
| Tensile strength | As specified |
| Yield strength 0.2% | As specified |
| Elongation | As specified |
| Hardness | As specified |
Numerical specification requirements are published only after the applicable current standard edition has been verified. Governing specification and condition to be verified: ASTM A240 for UNS S30403 — Annealed plate & sheet.
Full chemistry, properties and equivalents are on the SS 304L grade page.
Other SS 304L pipes & tubes
SS 304L Seamless Pipes for export
FOB / CIF · Nhava Sheva (JNPT), MumbaiSS 304L Seamless Pipe — questions buyers ask
Why choose seamless over welded pipe?
No longitudinal weld means uniform strength and corrosion resistance — preferred for pressure and critical service.
Can SS 304L seamless pipes be welded to carbon steel?
Yes — ER309L (or E309L electrode) is the usual filler when joining it to carbon steel.
Which standard covers SS 304L seamless pipes?
The material is ASTM A312 TP304L; dimensions follow ASME B36.19 · B36.10. Always state both on your purchase order, with the edition if your project specifies one.
What decides the price of a SS 304L seamless pipe?
The alloy price, the size and dimensions, quantity, and the testing and documents required. Send your list and we quote the same working day.
What documents do you supply?
EN 10204 3.1 mill certificates as standard, 3.2 with third-party inspection on request, plus dimensional and PMI reports.
Sources: the ASTM / ASME specifications named on this page and producer datasheets · Last updated October 2026