Stainless Steel Pipe and Pipe Fittings
Seamless and welded stainless pipe from 1/8" to 24" NB in Sch 5S to XXS, with matching ASME B16.9 buttweld fittings in 304L, 316L, 317L, 321, 347, 904L, Duplex 2205 and SDSS 2507 — IBR, PED and NACE options.
What is Stainless Steel Pipe & Pipe Fittings?
Stainless steel pipe is a hollow pressure-carrying section sized by nominal bore and schedule, supplied seamless to ASTM A312 / A376 and welded (EFW / ERW) to ASTM A312 / A358 in sizes from 1/8" NB to 24" NB in schedules 5S, 10S, 40S, 80S, 160 and XXS. Matching buttweld fittings — elbows, tees, reducers, caps and stub ends — are supplied to ASME B16.9 and ASTM A403, in 304/304L, 316/316L, 317L, 321, 347, 904L, Duplex 2205 and Super Duplex 2507, with EN 10204 3.1 / 3.2 certification and IBR, PED or NACE compliance where required.
All grades we stock in stainless steel pipe & pipe fittings.
Click any grade for its full chemical composition, mechanical properties, equivalents and typical applications. Every grade ships with EN 10204 3.1 / 3.2 certification from our Mumbai stockyard.
Why Choose Stainless Steel Pipe & Pipe Fittings
Seamless and welded options
Seamless pipe has no weld line and is preferred for high pressure and cyclic service; welded pipe is more economical, holds tighter roundness and is fully acceptable at 100% radiography for most process duties.
Full schedule range
From thin-wall Sch 5S / 10S for low-pressure and hygienic lines up to Sch 160 and XXS for high-pressure headers, all to ASME B36.19M / B36.10M dimensions.
Matched buttweld fitting system
Elbows, tees, reducers, caps, laterals and stub ends to ASME B16.9 in the same heat-treatment condition, so weld chemistry and wall thickness match the run pipe.
Pressure-code compliant
Supplied against ASME B31.1 / B31.3 design, with IBR Form III-C for Indian boiler service and PED 2014/68/EU documentation for European projects.
Corrosion grades for every medium
304L for water and general process, 316L for chlorides, 317L / 904L for acids, 321 / 347 for high temperature and Duplex / Super Duplex for seawater and high-strength duty.
Technical Specifications
| Attribute | Details |
|---|---|
| Standards — Pipe | ASTM A312 (seamless & welded) · A358 (EFW) · A376 (high temp) · A790 (duplex) · ASME SA312 |
| Standards — Fittings | ASME B16.9 / B16.28 · ASTM A403 (WP304/WP316) · A815 (duplex) · MSS SP-43 |
| Size Range | 1/8" NB to 24" NB (larger sizes fabricated from plate to order) |
| Schedules | Sch 5S, 10S, 20, 40S / STD, 80S / XS, 120, 160, XXS per ASME B36.19M |
| Manufacture | Seamless (SMLS), electric resistance welded (ERW), electric fusion welded (EFW) |
| Grades Stocked | 304 / 304L / 304H · 316 / 316L / 316Ti · 317L · 321 / 321H · 347 · 904L · Duplex 2205 · SDSS 2507 |
| Length | Single random 4–7 m · double random 7–13 m · exact cut lengths on request |
| Ends | Plain end (PE), bevelled end (BE 37.5°), threaded (NPT / BSP) |
| Fittings Range | 45° / 90° LR & SR elbows, equal & reducing tees, concentric & eccentric reducers, caps, stub ends, laterals |
| Testing | Hydrostatic, eddy current, radiography, IGC per ASTM A262, PMI, ferrite count on duplex |
| Certification | EN 10204 3.1 / 3.2 · IBR Form III-C · PED 2014/68/EU · NACE MR0175 |
Grade availability by schedule
| Grade | UNS | Sch 5S / 10S | Sch 40S | Sch 80S | Sch 160 | Buttweld fittings |
|---|---|---|---|---|---|---|
| SS 304 / 304L | S30400 / S30403 | |||||
| SS 316 / 316L | S31600 / S31603 | |||||
| SS 317L | S31703 | — | ||||
| SS 321 / 321H | S32100 / S32109 | — | ||||
| SS 347 | S34700 | — | ||||
| SS 904L | N08904 | — | ||||
| Duplex 2205 | S31803 | — | ||||
| SDSS 2507 | S32750 | — |
Note: Sizes above 24" NB are fabricated from plate to ASTM A358 Class 1 with 100% radiography.
Use our free metal weight calculator — bars, sheets, plates, pipes and sections.
Grade chemistry and mechanical properties supplied in stainless steel pipe & pipe fittings.
Chemical composition and mechanical properties are grade properties, not form properties — the same grade keeps the same chemistry whether it is supplied as sheet, plate or coil. The tables below list the specified limits for each grade we stock in stainless steel pipe & pipe fittings, tested and certified to ASTM A312 / A403. Values are weight percent (maximum unless a range is shown); mechanical values are minima in the annealed condition.
Chemical composition (weight %)
| Grade | C | Mn | Si | P | S | Cr | Ni | N | Mo | Ti | Nb+Ta | Cu | Nb |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| SS 201UNS S20100 | 0.15 | 5.50–7.50 | 1.00 | 0.060 | 0.030 | 16.0–18.0 | 3.5–5.5 | 0.25 | — | — | — | — | — |
| SS 202UNS S20200 | 0.15 | 7.50–10.00 | 1.00 | 0.060 | 0.030 | 17.0–19.0 | 4.0–6.0 | 0.25 | — | — | — | — | — |
| SS 304 / 304LUNS S30400 / S30403 | 0.08 (304) / 0.030 (304L) | 2.00 | 0.75 | 0.045 | 0.030 | 18.0–20.0 | 8.0–10.5 | 0.10 | — | — | — | — | — |
| SS 316 / 316LUNS S31600 / S31603 | 0.08 (316) / 0.030 (316L) | 2.00 | 0.75 | 0.045 | 0.030 | 16.0–18.0 | 10.0–14.0 | 0.10 | 2.00–3.00 | — | — | — | — |
| SS 321 / 321HUNS S32100 / S32109 | 0.08 (321) / 0.04–0.10 (321H) | 2.00 | 0.75 | 0.045 | 0.030 | 17.0–19.0 | 9.0–12.0 | — | — | 5×C–0.70 | — | — | — |
| SS 310 / 310SUNS S31000 / S31008 | 0.25 (310) / 0.08 (310S) | 2.00 | 1.50 | 0.045 | 0.030 | 24.0–26.0 | 19.0–22.0 | — | — | — | — | — | — |
| SS 347 / 347HUNS S34700 / S34709 | 0.08 (347) / 0.04–0.10 (347H) | 2.00 | 0.75 | 0.045 | 0.030 | 17.0–19.0 | 9.0–13.0 | — | — | — | 10×C–1.00 | — | — |
| SS 317LUNS S31703 | 0.030 | 2.00 | 0.75 | 0.045 | 0.030 | 18.0–20.0 | 11.0–15.0 | — | 3.00–4.00 | — | — | — | — |
| SS 904LUNS N08904 | 0.020 | 2.00 | 1.00 | 0.045 | 0.035 | 19.0–23.0 | 23.0–28.0 | — | 4.00–5.00 | — | — | 1.00–2.00 | — |
| 17-4 PHUNS S17400 | 0.07 | 1.00 | 1.00 | 0.040 | 0.030 | 15.0–17.5 | 3.0–5.0 | — | — | — | 0.15–0.45 | 3.0–5.0 | — |
| SS 410 / 410SUNS S41000 / S41008 | 0.15 | 1.00 | 1.00 | 0.040 | 0.030 | 11.5–13.5 | 0.75 | — | — | — | — | — | — |
| SS 430UNS S43000 | 0.12 | 1.00 | 1.00 | 0.040 | 0.030 | 16.0–18.0 | 0.75 | — | — | — | — | — | — |
| SS 409 / 409MUNS S40900 / S40930 | 0.030 | 1.00 | 1.00 | 0.040 | 0.020 | 10.5–11.7 | 0.50 | — | — | 6×C–0.75 | — | — | — |
| SS 441UNS S44100 | 0.030 | 1.00 | 1.00 | 0.040 | 0.030 | 17.5–18.5 | 0.50 | — | — | 0.10–0.60 | — | — | 0.30–0.90 |
Balance iron. Single figures are maximum limits. Mill test certificates to EN 10204 3.1 are issued with every dispatch.
Mechanical properties (annealed, minimum)
| Grade | Tensile Strength (min) | Yield Strength (0.2%) | Elongation in 50 mm | Hardness (Rockwell B) | Tensile Strength (H900) | Yield Strength (H900) | Hardness (Rockwell C) | Tensile Strength (annealed) | Hardness (Rockwell B, annealed) |
|---|---|---|---|---|---|---|---|---|---|
| SS 201 | 515 MPa (75 ksi) | 275 MPa (40 ksi) | 40% min | 95 max | — | — | — | — | — |
| SS 202 | 515 MPa (75 ksi) | 275 MPa (40 ksi) | 40% min | 95 max | — | — | — | — | — |
| SS 304 / 304L | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 40% min | 92 max | — | — | — | — | — |
| SS 316 / 316L | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 40% min | 95 max | — | — | — | — | — |
| SS 321 / 321H | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 40% min | 95 max | — | — | — | — | — |
| SS 310 / 310S | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 40% min | 95 max | — | — | — | — | — |
| SS 347 / 347H | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 40% min | 92 max | — | — | — | — | — |
| SS 317L | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 40% min | 95 max | — | — | — | — | — |
| SS 904L | 490 MPa (71 ksi) | 215 MPa (31 ksi) | 35% min | 90 max | — | — | — | — | — |
| 17-4 PH | — | — | 10% min | — | 1310 MPa (190 ksi) | 1170 MPa (170 ksi) | 40–48 | — | — |
| SS 410 / 410S | — | 275 MPa (40 ksi) | 20% min | — | — | — | — | 480 MPa (70 ksi) | 96 max |
| SS 430 | 450 MPa (65 ksi) | 205 MPa (30 ksi) | 22% min | 89 max | — | — | — | — | — |
| SS 409 / 409M | 380 MPa (55 ksi) | 205 MPa (30 ksi) | 20% min | 88 max | — | — | — | — | — |
| SS 441 | 415 MPa (60 ksi) | 205 MPa (30 ksi) | 18% min | 89 max | — | — | — | — | — |
Typical annealed values; actual results are stated on the heat-specific mill test certificate.
Application Sectors
Oil & Gas
Process piping, flowlines and utility headers in 316L, Duplex 2205 and SDSS 2507.
Refineries & Petrochemical
High-temperature transfer lines and reactor piping in 321H, 347 and 317L.
Chemical Plants
Acid and solvent service lines in 316L and 904L with full traceability.
Power Generation
Boiler feed, condensate and steam piping to IBR in 304H and 321H.
Pharma & Food
Hygienic process lines in 316L, Sch 10S with internally polished bore.
Water & Desalination
Seawater intake, brine and RO piping in Duplex 2205 and SDSS 2507.
Pulp & Paper
Bleach-plant and digester piping in 317L and 904L.
Fire & Utilities
Fire-water ring mains and instrument air lines in 304L Sch 10S.
Cut, finished and certified to your drawing.
Material leaves our Mumbai facility finished to your specification — not as raw stock.
Why buy from Steelco.
Steelco Metal & Alloys is a Mumbai-based stockist, importer and exporter of stainless steel and nickel alloys, shipping certified material worldwide.
Quality & testing on every dispatch
- EN 10204 3.1 mill test certificate on every dispatch
- 3.2 certification with TÜV / SGS / BV / Lloyd's / IRS / IBR witness on request
- Positive Material Identification (PMI) with portable XRF / OES
- Dye-penetrant (DPT), ultrasonic (UT) and hydro testing on request
- NACE MR0175 / ISO 15156 compliance for sour service
- PED 2014/68/EU compliance for pressure equipment
- Heat-number stencilling and marking for full traceability
Deep ready stock
Over 1,000 MT of stainless pipe and buttweld fittings in stock from 1/8" to 24" NB in 304L, 316L, 317L, 321, 347, 904L, Duplex 2205 and SDSS 2507 — most schedules dispatch within 24–72 hours.
Mill-direct sourcing
Approved supply from Jindal, JSL, Outokumpu, Aperam, Acerinox, Sandvik and leading Japanese and Korean mills — every item traceable to a named producer.
Full certification
EN 10204 3.1 mill test certificate as standard, 3.2 with TÜV, SGS, BV, Lloyd's, IRS or IBR witness, plus PMI, DPT and UT reports on request.
On-time worldwide delivery
Regular export shipments to the GCC, Africa, Southeast Asia, Europe, Latin America and the USA via Nhava Sheva (JNPT), Mundra and Mumbai ports.
How your material is packed and shipped.
Every consignment leaves our Mumbai facility protected for transit and documented for customs, whether it moves by road within India or by sea to an overseas port.
Domestic & export packing
- Pipes bundled in hexagonal bundles with steel strapping
- Plastic end caps fitted to protect bevels and threads
- Fittings individually poly-bagged and boxed by size
- Wooden crates for export with VCI paper and desiccant
Global shipments
- HS Code: 7304 (seamless) · 7306 (welded) · 7307 (fittings)
- FOB / CFR / CIF terms via Nhava Sheva (JNPT), Mundra and Mumbai ports
- Documentation: commercial invoice, packing list, MTC, bill of lading, COO, insurance
- Regular exports to the GCC, Africa, Southeast Asia, Europe, Latin America and the USA
Ready to price your requirement?
Share grade, size and quantity — our Mumbai desk responds with pricing, stock position and lead time, usually the same working day.
Frequently asked questions.
Answers to the questions our Mumbai desk is asked most often.
What is the difference between seamless and welded stainless pipe?
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Seamless pipe is extruded or pierced from a solid billet and has no weld seam, so it is preferred for high pressure, cyclic loading and critical service. Welded pipe (ERW or EFW) is formed from strip or plate and welded longitudinally; it costs less, holds better roundness and wall consistency, and with 100% radiography is fully acceptable for most process and utility piping.
What is the difference between pipe schedule and wall thickness?
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Schedule is a standardised wall-thickness designation. For a given nominal bore, a higher schedule means a thicker wall and a smaller internal diameter, while the outside diameter stays constant. For example, 4" NB pipe is always 114.3 mm OD, but Sch 10S is 3.05 mm wall and Sch 40S is 6.02 mm wall.
Do fittings come from the same heat as the pipe?
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Not automatically, but they are supplied in the same grade, heat-treatment condition and wall schedule so welding parameters match. If your specification requires single-heat traceability across pipe and fittings, tell us at enquiry stage and we will source them together and certify accordingly.
Can you supply IBR-certified pipe?
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Yes. IBR Form III-C certification is available for boiler and steam service in 304H, 316L and 321H, issued through the Indian Boiler Regulations authority, alongside the standard EN 10204 3.1 or 3.2 mill test certificate.
Which grade should be used for seawater piping?
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Standard 316L is not reliable in stagnant seawater. Use Duplex 2205 for general seawater duty and Super Duplex 2507 (PREN 42) for high-temperature or high-chloride seawater, brine and firewater ring mains; 904L is an alternative where sulphuric and phosphoric acid resistance is also required.
Do you fabricate pipe spools?
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Yes. We cut, bevel, bend and weld pipe spools to isometric drawings, with WPS/PQR-qualified welders, radiography, hydrostatic testing, pickling and passivation, delivered ready for site erection.