Somewhere right now a fabricator is calling pipe what his drawing calls tube, and the quote will come back wrong because of it. Metinox Overseas is a stainless steel pipes and tubes manufacturer and supplier in Mumbai, stocking austenitic, duplex and super duplex material under one roof and shipping it to project sites across India, the USA, the Middle East and Africa with EN 10204 3.1 paperwork on every heat. This page is the top of our catalogue. Everything below it splits two ways, by form and by family, and choosing well takes about three questions. The pipe side of the house starts at Stainless Steel Pipes.
The other side matters just as much. Tube is the precision cousin, sold on exact OD and wall, held to tighter tolerances, and built for heat exchangers, instruments and sanitary lines rather than process runs. That half of the catalogue lives at Stainless Steel Tubes, and if you are not certain which half you need, the next fold settles it in one table.
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Table of content
- Pipe or Tube? Settle It Before the Enquiry
- Pipes and Tubes by Material Family: Stainless to Super Duplex
- When to Step Beyond Stainless
- Industrial Pipes & Tubes Specifications
- Pipe Standards vs Tube Standards: The Full Map
- Three Questions That Pick Your Pipes and Tubes
- Pipes and Tubes Applications by Industry
- Pipes & Tubes Testing, Certification & Export to USA, Middle East & Africa
- Explore the Pipes and Tubes Range
- Pipes and Tubes: Frequently Asked Questions
Pipe or Tube? Settle It Before the Enquiry
Half the mis-orders in this trade start here, so here is the whole distinction in one table.
| Pipe | Tube | |
|---|---|---|
| Sized by | Nominal bore (NB) and schedule | Exact OD and wall thickness (mm or BWG) |
| A 1" example measures | 33.4 mm outside | 25.4 mm outside |
| Tolerances | Looser, per ASTM A999 | Tighter, per ASTM A1016 |
| Standards family | A312, A358, A778, A790 | A213, A249, A269, A270, A554, A789 |
| Built for | Carrying fluid between points: process, utility and transfer lines | Fitting equipment: exchanger bundles, tube sheets, instruments, sanitary skids |
| Price logic | Follows NB, schedule and route | Follows OD, wall, finish and form (straight, U-bend, coil) |
Same alloys on both sides, different worlds after that. Pipe buyers continue at Stainless Steel Pipes; tube buyers at Stainless Steel Tubes.
When to Step Beyond Stainless
Two escalations sit past this table. Grade 904L answers sulphuric and phosphoric acid duty that 316L cannot hold, and nickel alloys take over where chemistry or temperature defeats stainless altogether. We supply both against order; name the service conditions in the enquiry and the quote will say plainly whether the step up is necessary or whether stainless does the job for less.
Three Questions That Pick Your Pipes and Tubes
Every enquiry we quote well answers these three. Most that go wrong skipped one.
- One: pipe or tube? Form follows the drawing. NB and schedule means pipe; exact OD and wall means tube. The table above settles arguments.
- Two: what is in the fluid? Chlorides are the question that matters. Fresh water runs on 304; anything chlorinated, brackish or acidic moves toward SS 316/316L and beyond. The full chloride ladder, with PREN, lives on the tubes hub.
- Three: how hot, including upsets? Temperature picks between the L, H, stabilized and heat-resisting grades, and it disqualifies duplex above 300°C. The full temperature ladder lives on the pipes hub.
Answer all three in the enquiry and the grade, standard and form name themselves, usually in one reply from us.
Pipes & Tubes Testing, Certification & Export to USA, Middle East & Africa
One regime covers the whole catalogue. Pipe is hydrotested or NDE examined per A312 or A790, tube per the A1016 general requirements, with intergranular corrosion testing to ASTM A262 and PMI verification on request. Every order carries an EN 10204 3.1 mill test certificate, heat-number traceable, and 3.2 witnessed certification through BV, SGS or TUV is arranged at order stage. Metinox Overseas is an ISO 9001 and PED certified company, approved to the procurement standards of SABIC, ADNOC, KNPC, EIL, IOCL and BPCL, which is why Gulf paperwork clears the first time; the program is on our Quality Policy page. Export cargo moves from Mumbai in scheduled consolidations to the USA, the Middle East and Africa, with pipe bundled and end-protected and tube crated and end-capped as described on Packing and Dispatch. Ex-stock material dispatches in 7 to 14 working days; made-to-order items take 4 to 6 weeks.
Explore the Pipes and Tubes Range
Stainless Steel Pipes
Stainless Steel Seamless Pipes
Stainless Steel Welded Pipes
Stainless Steel EFW Pipes
Stainless Steel Tubes
Special Alloys Pipes & Tubes
Alloy Steel Pipes
Alloy Steel Tubes
Carbon Steel Pipes & Tubes
ASTM A333 Gr 6 LTCS Pipes
Duplex Steel Pipes
Duplex Steel Tubes
Super Duplex Steel Pipes
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Super Duplex Steel Tubes
Pipes and Tubes: Frequently Asked Questions
Pipe is sized by nominal bore and schedule and built to carry fluid from A to B. Tube is sized by exact OD and wall and built to fit equipment: tube sheets, compression fittings, instruments. Tolerances run looser on pipe and tighter on tube, the standards belong to different families, and the prices follow different logic. When a drawing says one and means the other, the quote is the first casualty.
Yes. Consolidations leave Mumbai on regular schedules for all three regions. Gulf orders clear on our SABIC, ADNOC and KNPC approvals, US shipments carry the complete EN 10204 3.1 documentation set that customs and end clients expect, and African project cargo is crated for the long inland leg after the port.
Stainless austenitic grades cover most duty and most budgets. Duplex earns its place when chloride stress corrosion cracking or strength governs the design, and super duplex when the water is seawater. Cost rises in that order, and so does the cost of specifying one level lower than the service demands.
Every order ships with an EN 10204 3.1 mill test certificate, heat-number traceable, plus test reports per the governing ASTM standard and a packing list matched to the crate markings for customs clearance. Third-party 3.2 certification through BV, SGS or TUV is arranged at order stage when the project specification calls for it.
Yes, and it is usually the cheaper way to buy. Pipes, tubes and the matching flanges and fittings consolidate into one shipment with one documentation set, which saves freight and spares you the four-way chase when papers go missing at customs.
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