Carbon Steel
ASTM A106 Gr B, API 5L, A105, A234 WPB, A516 Gr 70 and IS 2062 in pipe, fitting, flange, plate, sheet and bar form — IBR and third-party inspection on request.
What is carbon steel?
Carbon steel is an iron-carbon alloy with up to about 2% carbon and no significant alloying additions, used for the bulk of pressure piping, structural steelwork and pressure-vessel plate. The standard grades in process plant are ASTM A106 Grade B seamless pipe, API 5L Gr B / X42–X70 line pipe, A105 forged flanges, A234 WPB buttweld fittings and A516 Grade 70 pressure-vessel plate.
Steelco Metal & Alloys supplies carbon steel from Mumbai in seamless and welded pipe, buttweld and forged fittings, flanges, plate, sheet and bar, including IBR-certified pipe and fittings for boiler service. Every dispatch leaves our Mumbai warehouse with an EN 10204 3.1 mill test certificate (3.2 with TUV, SGS, BV, Lloyd's, IRS or IBR witness on request), PMI verification and full heat-number traceability.
Carbon steel grades we stock.
Standard pressure-piping, structural and pressure-vessel grades held in ready stock in Mumbai.
Carbon Steel we hold in ready stock.
Seamless pipe
1/2" – 24" NB ASTM A106 Gr B / API 5L Gr B, Sch 20 to XXS, IBR on request.
Welded & ERW pipe
1/2" – 48" NB ASTM A53, API 5L ERW / LSAW / HSAW.
Buttweld fittings
ASME B16.9 A234 WPB elbows, tees, reducers and caps.
Flanges
ASTM A105 forged flanges 1/2" – 48", Class 150 – 2500.
Plate & sheet
A516 Gr 70, A36, IS 2062 E250 / E350 from 3 mm to 150 mm.
Bar & structurals
Round bar, angle, channel and beams in IS 2062 and A36.
Use our free metal weight calculator — bars, sheets, plates, pipes and sections.
Our carbon steel range
Ready stock across every mainstream form — dispatched with mill test certificates and full traceability from our Mumbai warehouse.
Pipe & Fittings
A106 / API 5L 1/2" – 24" NB with A234 WPB fittings.
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Flanges
A105 forged, Class 150 – 2500.
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Plate
A516 Gr 70 and IS 2062, 5 – 150 mm.
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Sheet & Coil
HR and CR sheet 1.2 – 12 mm.
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Round Bar
Ø 10 – 300 mm bright and black bar.
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Structurals
Angle, channel, beam and flat sections.
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MS Gratings
Plain, serrated and swage-locked gratings.
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Welding Consumables
E6013, E7018 electrodes and ER70S-6 wire.
ExploreCarbon Steel specifications.
Standards, sizes, thickness and condition we routinely supply across every product form.
| Product | Size Range | Thickness / Wall | Finish / Condition | Standards |
|---|---|---|---|---|
Seamless Pipe | 1/2" – 24" NB | Sch 20 – XXS | Black, varnished, galvanised | ASTM A106 Gr B / API 5L |
ERW / Welded Pipe | 1/2" – 48" NB | Sch 10 – Sch 80 | Black or galvanised | ASTM A53 / API 5L |
Plate | 1250 – 3000 mm wide | 5 – 150 mm | Hot-rolled, normalised | ASTM A516 Gr 70 / IS 2062 |
Buttweld Fittings | 1/2" – 48" | Sch 10 – XXS | Black, bevelled ends | ASTM A234 WPB / ASME B16.9 |
Flanges | 1/2" – 48" | Class 150 – 2500 | RF / FF / RTJ | ASTM A105 / ASME B16.5 / B16.47 |
Round Bar | Ø 10 – 300 mm | — | Black, bright drawn | IS 2062 / ASTM A36 |
Note: IBR Form III-C certification available for boiler-grade pipe, fittings and flanges.
Where carbon steel is used.
Oil & Gas
Transmission pipelines, plant piping and structural skids in API 5L and A106.
Power
Boiler feed piping, headers and IBR-certified steam lines.
Water & Infrastructure
Water transmission mains, penstocks and pile casings.
Construction
Structural steelwork, gratings, handrails and platforms.
Pressure Vessels
A516 Gr 70 shells, tanks and heat-exchanger shells.
General Fabrication
Workshop fabrication, supports and machine bases.
Frequently asked questions.
Answers to the questions our Mumbai desk is asked most often.
What is the difference between ASTM A106 and API 5L pipe?
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A106 Grade B is a seamless carbon steel pipe specified for high-temperature service in refineries and power plants, with mandatory chemistry and mechanical control per heat. API 5L Grade B is a line-pipe specification aimed at oil and gas transmission, allowing seamless and welded manufacture. Many mills dual-certify pipe to both.
Do you supply IBR-certified carbon steel pipe?
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Yes. IBR Form III-C certified A106 Gr B pipe, A234 WPB fittings and A105 flanges are supplied for boiler and steam service, along with the full documentation set required for boiler inspectorate approval.
Which carbon steel plate is used for pressure vessels?
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ASTM A516 Grade 70 is the standard pressure-vessel plate for moderate and lower-temperature service, supplied normalised for improved toughness, with A537 Class 1 used where higher strength is needed. Impact testing at -20 °C or -46 °C is arranged where the design code requires it.
Every dispatch is traceable, tested and certified.
Material is supplied with EN 10204 3.1 (3.2 on request) mill test certificates, PMI and spectro verification, and is open to third-party inspection by TUV, SGS, BV, Lloyd’s and IRS from our Mumbai warehouse.
EN 10204 3.1 / 3.2
Mill test certificate with every consignment.
PMI & Spectro
Positive material identification before dispatch.
Third-party Inspection
TUV · SGS · BV · Lloyd's · IRS welcome.
Export Documentation
Full set prepared for 40+ countries.
Other grades you may also need
Ready to price your requirement?
Share your grade, form, size and quantity — our Mumbai desk responds with pricing, stock position and lead time, usually the same working day.