Carbon Steel Pipe and Pipe Fittings
Seamless and welded carbon steel pipe from 1/8" to 48" NB in ASTM A106 Gr. B, A53 Gr. B and API 5L, Sch 10 to XXS, with matching A234 WPB buttweld fittings, A105 flanges and IBR certification.
What is Carbon Steel Pipe & Pipe Fittings?
Carbon steel pipe is the workhorse of process, utility and structural piping, supplied seamless or welded and matched with buttweld fittings of the same wall thickness. Steelco stocks ASTM A106 Gr. B, A53 Gr. B and API 5L Gr. B / X42–X65 pipe from 1/8" to 48" NB in Sch 10 to XXS, with A234 WPB fittings, A105 flanges and IBR certification where required — all traceable to named Indian and international mills.
All grades we stock in carbon 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 Carbon Steel Pipe & Pipe Fittings
Seamless and welded
Hot-finished seamless A106 Gr. B for pressure service and ERW / LSAW A53 and API 5L for utility and transmission lines.
Complete fitting range
A234 WPB elbows, tees, reducers and caps in the matching schedule, plus A105 flanges and forged A105 socket-weld fittings.
Low-temperature option
ASTM A333 Gr. 6 pipe and A420 WPL6 fittings impact tested at –45 °C for refrigeration and LNG-adjacent duty.
IBR certification
IBR Form III-C for boiler and steam piping in India, with third-party inspection arranged in-house.
Coating and lining
3LPE, FBE, coal-tar epoxy and cement-mortar lining available for buried and water-service pipelines.
Mill traceability
Every length traceable to a named producer with heat number, chemistry, mechanical and hydro test records.
Technical Specifications
| Attribute | Details |
|---|---|
| Pipe Standards | ASTM A106 Gr. B/C · ASTM A53 Gr. B · API 5L Gr. B / X42–X65 · ASTM A333 Gr. 6 · IS 1239 / IS 3589 |
| Fitting Standards | ASME B16.9 · ASTM A234 WPB / WPC · A420 WPL6 · ASME B16.11 forged fittings |
| Flange Standards | ASME B16.5 · B16.47 · ASTM A105 · EN 1092-1 |
| Size Range | 1/8" to 24" NB seamless · up to 48" NB welded |
| Schedules | Sch 10 · 20 · 30 · 40 · STD · 60 · 80 · XS · 100 · 120 · 160 · XXS |
| Manufacturing | Hot-finished seamless · cold-drawn seamless · ERW · EFW · LSAW · SSAW |
| Length | Single random (5–7 m) · double random (11–13 m) · cut to length |
| End Finish | Plain end · bevelled 30° per ASME B16.25 · threaded NPT / BSP · grooved |
| Yield Strength | 240 MPa minimum (A106 Gr. B) · 448 MPa (API 5L X65) |
| Coating | Black · varnished · galvanised · 3LPE · FBE · coal-tar epoxy |
| Testing | Hydrostatic, ultrasonic, radiography on welds, Charpy impact, hardness, PMI |
| Certification | EN 10204 3.1 standard · 3.2 with witness · IBR Form III-C on request |
Grade availability by size band
| Grade | UNS | 1/8"–2" | 2.1/2"–6" | 8"–12" | 14"–24" | 26"–48" |
|---|---|---|---|---|---|---|
| A106 Gr. B seamless | K03006 | — | ||||
| A53 Gr. B ERW | K03005 | — | ||||
| API 5L X42–X65 | — | — | ||||
| A333 Gr. 6 low temp | K03006 | — | — | |||
| A234 WPB fittings | K03006 |
Note: Sizes above 48" NB, heavy-wall and clad pipe are rolled to order on a 4–10 week lead time.
Use our free metal weight calculator — bars, sheets, plates, pipes and sections.
Grade chemistry and mechanical properties supplied in carbon 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 carbon steel pipe & pipe fittings. Values are weight percent (maximum unless a range is shown); mechanical values are minima in the annealed condition.
Chemical composition (weight %)
| Grade | C | Mn | P | S | Si | Cr | Mo | Nb + V + Ti | Cr + Mo |
|---|---|---|---|---|---|---|---|---|---|
| ASTM A106 Gr BUNS K03006 | 0.30 | 0.29–1.06 | 0.035 | 0.035 | 0.10–— | 0.40 | 0.15 | — | — |
| API 5L Gr B / X42 – X70API 5L PSL1 / PSL2 | 0.28 (Gr B) / 0.12 (X70) | 1.20 (Gr B) / 1.70 (X70) | 0.030 | 0.030 | — | — | — | 0.15 total | — |
| ASTM A333 Gr 6UNS K03006 | 0.30 | 0.29–1.06 | 0.025 | 0.025 | 0.10–— | — | — | — | — |
| ASTM A234 WPBUNS K03006 | 0.30 | 0.29–1.06 | 0.050 | 0.058 | 0.10–— | — | — | — | — |
| ASTM A105UNS K03504 | 0.35 | 0.60–1.05 | 0.035 | 0.040 | 0.35 | — | — | — | 0.32 combined |
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 (min) | Elongation (longitudinal) | Max service temperature | Yield Strength — Gr B | Yield Strength — X42 / X52 | Yield Strength — X60 / X65 / X70 | Charpy impact (PSL2) | Charpy V-notch | Elongation | Heat treatment | Elongation in 50 mm | Hardness |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A106 Gr B | 415 MPa (60 ksi) | 240 MPa (35 ksi) | 30% min | 425 °C typical | — | — | — | — | — | — | — | — | — |
| API 5L Gr B / X42 – X70 | — | — | — | — | 245 MPa min | 290 / 360 MPa min | 415 / 450 / 485 MPa min | 27 J min at 0 °C typical | — | — | — | — | — |
| ASTM A333 Gr 6 | 415 MPa (60 ksi) | 240 MPa (35 ksi) | — | — | — | — | — | — | 18 J average at −45 °C | 30% min (longitudinal) | — | — | — |
| ASTM A234 WPB | 415 MPa (60 ksi) | 240 MPa (35 ksi) | — | — | — | — | — | — | — | 22% min (transverse) | Normalised or normalised & tempered | — | — |
| ASTM A105 | 485 MPa (70 ksi) | 250 MPa (36 ksi) | — | — | — | — | — | — | — | — | — | 30% min | 187 HB max |
Typical annealed values; actual results are stated on the heat-specific mill test certificate.
Application Sectors
Oil & Gas
Flowlines, gathering systems and plant piping in A106 Gr. B and API 5L.
Refineries
Process and utility headers to ASME B31.3 with A234 WPB fittings.
Power Plants
Steam, feedwater and condensate lines with IBR certification.
Water Infrastructure
Transmission mains and pumping stations in cement-lined welded pipe.
Fire Protection
Sprinkler and hydrant networks in galvanised A53 pipe.
Structural
Columns, piling and support structures in IS 1239 / IS 3589 pipe.
HVAC
Chilled water and steam distribution across plants and buildings.
Shipbuilding
Ballast, bilge and fuel-oil piping to class society approval.
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
Carbon steel pipe held in Mumbai from 1/8" to 24" NB in Sch 10 to XXS with matching A234 WPB fittings and A105 flanges — most sizes dispatched 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 packs with steel strapping
- Plastic bevel protectors and end caps fitted
- Fittings packed in wooden cases and cartons by size
- Varnish or oil coating applied against transit rust
Global shipments
- HS Code: 7304 (seamless) · 7305 / 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 ASTM A106 and A53 pipe?
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A106 Gr. B is a hot-finished seamless pipe intended for high-temperature pressure service and is fully killed. A53 Gr. B can be seamless or ERW and is a general-purpose pipe for mechanical and low-pressure duty. For steam and process lines above 200 °C, specify A106.
Which fittings match carbon steel pipe?
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ASTM A234 WPB buttweld fittings to ASME B16.9 in the same schedule, A105 forged flanges to ASME B16.5, and A105 socket-weld or threaded fittings to ASME B16.11 for small bore.
Do you supply IBR-certified carbon steel pipe?
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Yes. IBR Form III-C certification is arranged for boiler and steam piping in India, alongside EN 10204 3.1 or 3.2 material certificates and hydrostatic test reports.
What is the difference between Sch 40 and Sch 80?
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Schedule sets the wall thickness for a given nominal bore. Sch 80 is thicker than Sch 40, so it carries higher pressure but has a smaller internal bore and costs more per metre. For 4" NB, Sch 40 is 6.02 mm wall against 8.56 mm for Sch 80.
Can you supply pipe for low-temperature service?
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Yes. ASTM A333 Gr. 6 pipe with A420 WPL6 fittings, impact tested at –45 °C, for refrigeration, cryogenic-adjacent and cold-climate installations.