For buyers looking for a pipes and tubes manufacturer in India, Metinox Overseas, based in Mumbai, supplies and exports stainless steel pipes and stainless steel tubes, duplex and super duplex pipes, carbon steel, alloy steel and nickel and special alloy grades. We handle seamless pipe for high pressure and high temperature lines, and welded and EFW pipe for utility, water and larger diameter work. Our buyers are mostly refineries, petrochemical plants and EPC contractors, in India and across the GCC. Each order ships with an EN 10204 3.1 certificate. If your project needs witnessed testing, we can arrange 3.2 through BV, SGS or TÜV.
Need two lengths for a shutdown, or the full quantity on a project BOM? Send us the grade, size, quantity and port of delivery, and we will price it against your specification.
Table of Contents
- Pipes and Tubes Difference: Sizing, Standards and Use
- Pipes and Tubes Supplier Specifications
- Stainless Steel Pipes and Tubes Range by Grade
- Duplex Steel Pipes and Super Duplex Pipes and Tubes
- Chemical Composition of Stainless and Duplex Pipes and Tubes
- Mechanical Properties of Pipes and Tubes by Grade
- Beyond Stainless: Carbon, Alloy and Nickel Pipes and Tubes
- SS Pipes and Tubes Dimension Chart, Schedules 5S to 80S
- Weight per Metre for Stainless Steel Pipes and Tubes, Schedule 40S
- Pipes and Tubes Equivalents Standards
- Seamless or Welded: Choosing the Route for Stainless Steel Pipes and Tubes
- Industrial Pipes and Tubes in GCC and Export Applications
- What Sets the Price of SS Pipes and Tubes
- Inspection, Certificates and PMI on Every Pipes and Tubes Order
- Packing Pipes and Tubes for Sea Freight and GCC Site Laydown
- Fittings and Flanges to Complete Your Pipes and Tubes System
- Send Your Pipes and Tubes Enquiry
- FAQ: Pipes and Tubes
Pipes and Tubes Difference: Sizing, Standards and Use
Pipes and tubes are both hollow round sections, often in the same grade. They are ordered differently, built to different standards, and used for different jobs. Knowing which one you need decides the standard, the tolerance and the price on your quotation.
| Basis | Pipe | Tube |
|---|---|---|
| Common standards | ASTM A312, A106, A335, A790, API 5L | ASTM A213, A249, A269, A789 |
| Size range | Usually NPS 1/8 upward, into large diameters | Usually small to medium OD |
| Dimensional tolerance | Wider, per ASTM A999 or A530 | Tighter, per ASTM A1016 |
| How it is sized | Nominal Pipe Size (NPS) or Nominal Bore (DN), plus a schedule | Actual outside diameter and wall thickness |
| Wall thickness | Set by schedule: Sch 10S, 40S, 80, 160, XS, XXS | Given directly in mm or BWG gauge |
| Main purpose | Carrying liquids and gases from one point to another | Transferring heat, or fitting precisely into equipment |
| Applications | Process lines, utilities, pipelines, steam lines | Heat exchangers, boilers, condensers, instrumentation |
| Supplied forms | Straight lengths | Straight lengths, U-bends, coils |
| Joining methods | Butt weld, socket weld, flanges, threads | Tube sheets, compression fittings, orbital welding |
In short: a pipe is chosen by how much fluid it must carry and at what pressure. A tube is chosen by how precisely it has to fit.
Pipes and Tubes Supplier Specifications
| Parameter | Range |
|---|---|
| Standards | ASTM/ASME, EN, BS, DIN, JIS, API 5L, IBR |
| Tube Size | 1/2″ OD to 8″ OD |
| Pipe size | NPS 1/2 to 24 (DN 15 to 600) standard range; larger EFW to order |
| Wall thickness | Sch 5S, 10S, 40S, 80S (stainless); Sch 40, 80, 160, STD, XS, XXS (carbon and alloy) |
| Types | Seamless; welded (ERW, EFW) |
| Length | Single random, double random, cut length; 5.8 m and 11.8 m for container loading |
| End finish | Plain end, bevelled end, threaded |
| Form | Round; tube also as U-bend and coil where grade allows |
| Certification | EN 10204 3.1 / 3.2 MTC, PMI, IGC, hydrotest, radiography |
| Quotation terms | CIF; other Incoterms confirmed at enquiry |
Have a BOM or a single line item? Send the grade, size, schedule, quantity and destination port and we will quote it against your specification. Request a quote for pipes and tubes
Stainless Steel Pipes and Tubes Range by Grade
Austenitic stainless is the largest part of the range. Each grade below has its own page with full data.
| Grade | UNS | Bought for | Page |
|---|---|---|---|
| 304 / 304L | S30400 / S30403 | General process, water, food | SS 304 pipes, SS 304L |
| 304H | S30409 | High temperature strength | SS 304H |
| 316 / 316L | S31600 / S31603 | Chlorides, mild acids | SS 316/316L |
| 316H, 316Ti | S31609, S31635 | High temperature service | SS 316H, SS 316Ti |
| 317L | S31703 | Higher Mo for acid duty | SS 317/317L |
| 321 / 321H | S32100 / S32109 | Stabilised, 425 to 815 °C service | SS 321/321H |
| 347 / 347H | S34700 / S34709 | Stabilised, heater and furnace lines | SS 347/347H |
| 310S / 310H | S31008 / S31009 | Oxidation resistance at high temperature | SS 310S |
| 904L | N08904 | Sulphuric and phosphoric acid | SS 904L |
By route: seamless, welded, EFW. By form: stainless steel pipes, stainless steel tubes, bright annealed tubes.
Duplex Steel Pipes and Super Duplex Pipes and Tubes
Duplex 2205 has roughly twice the yield strength of 316L and much better resistance to chloride stress corrosion cracking. Super duplex goes further, with a PREN above 40, and is the usual choice for seawater and desalination lines. Both are normally limited to about 250 to 300 °C in pressure service, because of 475 °C embrittlement at higher temperatures.
| Grade | UNS | Pipe / tube standard | Page |
|---|---|---|---|
| Duplex 2205 | S31803 / S32205 | A790 / A789 | Duplex S31803/S32205 pipe, tube |
| Super duplex 2507 | S32750 | A790 / A789 | S32750 pipe, tube |
| Super duplex | S32760 | A790 / A789 | S32760 pipe, tube |
Family overviews: duplex steel pipes, super duplex steel pipes, super duplex steel tubes.
Chemical Composition of Stainless and Duplex Pipes and Tubes
| Grade | C max | Cr | Ni | Mo | N |
|---|---|---|---|---|---|
| 304L | 0.030 | 18.0–20.0 | 8.0–13.0 | – | – |
| 316L | 0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | – |
| 321 | 0.08 | 17.0–19.0 | 9.0–12.0 | – | Ti 5×(C+N) min |
| S32205 | 0.030 | 22.0–23.0 | 4.5–6.5 | 3.0–3.5 | 0.14–0.20 |
| S32750 | 0.030 | 24.0–26.0 | 6.0–8.0 | 3.0–5.0 | 0.24–0.32 |
Mechanical Properties of Pipes and Tubes by Grade
| Grade / standard | Tensile min (MPa) | Yield min (MPa) | Elongation min (%) |
|---|---|---|---|
| A312 TP304L | 485 | 170 | 35 |
| A312 TP316L | 485 | 170 | 35 |
| A790 S32205 | 655 | 485 | 25 |
| A790 S32750 | 800 | 550 | 15 |
| A106 Gr B | 415 | 240 | per spec formula |
Beyond Stainless: Carbon, Alloy and Nickel Pipes and Tubes
Carbon steel. ASTM A106 Gr B for plant piping, API 5L X-series for pipelines, and ASTM A333 Gr 6 for low temperature service. Overview: carbon steel pipes and tubes.
Alloy steel. A335 P11, P22 and P91 carry steam and hydrogen service at temperatures carbon steel cannot hold. See alloy steel pipes and alloy steel tubes.
Nickel and special alloys. Inconel 625, Incoloy 825, Monel 400, Hastelloy C276 and C22, Alloy 20, 254 SMO and Alloy 28 take over where stainless runs out of margin. Overview: special alloy pipes and tubes.
Seawater and cooling. Titanium, cupro-nickel 90/10, 70/30, copper, brass and condenser tubes.
SS Pipes and Tubes Dimension Chart, Schedules 5S to 80S
Wall thickness in mm per ASME B36.19M. Imperial OD alongside. Carbon and alloy schedules are on the pipe schedule chart.
| NPS (in) | DN | OD (mm) | OD (in) | Sch 5S | Sch 10S | Sch 40S | Sch 80S |
|---|---|---|---|---|---|---|---|
| 1/2 | 15 | 21.3 | 0.840 | 1.65 | 2.11 | 2.77 | 3.73 |
| 3/4 | 20 | 26.7 | 1.050 | 1.65 | 2.11 | 2.87 | 3.91 |
| 1 | 25 | 33.4 | 1.315 | 1.65 | 2.77 | 3.38 | 4.55 |
| 1 1/2 | 40 | 48.3 | 1.900 | 1.65 | 2.77 | 3.68 | 5.08 |
| 2 | 50 | 60.3 | 2.375 | 1.65 | 2.77 | 3.91 | 5.54 |
| 3 | 80 | 88.9 | 3.500 | 2.11 | 3.05 | 5.49 | 7.62 |
| 4 | 100 | 114.3 | 4.500 | 2.11 | 3.05 | 6.02 | 8.56 |
| 6 | 150 | 168.3 | 6.625 | 2.77 | 3.40 | 7.11 | 10.97 |
| 8 | 200 | 219.1 | 8.625 | 2.77 | 3.76 | 8.18 | 12.70 |
| 10 | 250 | 273.1 | 10.750 | 3.40 | 4.19 | 9.27 | 12.70 |
| 12 | 300 | 323.8 | 12.750 | 3.96 | 4.57 | 9.53 | 12.70 |
Weight per Metre for Stainless Steel Pipes and Tubes, Schedule 40S
Calculated from nominal OD and wall: W (kg/m) = π × (OD − t) × t × ρ / 1000, with ρ = 7.93 g/cm³ for 304.
| NPS (in) | OD (mm) | Wall 40S (mm) | Weight (kg/m) | Weight (lb/ft) |
|---|---|---|---|---|
| 1/2 | 21.3 | 2.77 | 1.28 | 0.86 |
| 3/4 | 26.7 | 2.87 | 1.70 | 1.14 |
| 1 | 33.4 | 3.38 | 2.53 | 1.70 |
| 1 1/2 | 48.3 | 3.68 | 4.09 | 2.75 |
| 2 | 60.3 | 3.91 | 5.49 | 3.69 |
| 3 | 88.9 | 5.49 | 11.41 | 7.67 |
| 4 | 114.3 | 6.02 | 16.24 | 10.91 |
| 6 | 168.3 | 7.11 | 28.55 | 19.19 |
| 8 | 219.1 | 8.18 | 42.98 | 28.88 |
| 10 | 273.1 | 9.27 | 60.93 | 40.94 |
| 12 | 323.8 | 9.53 | 74.61 | 50.14 |
Full weight tables for all schedules: SS pipe weight chart.
Pipes and Tubes Equivalents Standards
EN grades are near equivalents, not direct substitutes. Your project specification decides whether a substitution is acceptable.
| Product | ASTM / ASME / API | EN equivalent | DIN / W.Nr | JIS |
|---|---|---|---|---|
| 304 pipe | A312 TP304 | EN 10216-5, 10217-7: X5CrNi18-10 | 1.4301 | G3459 SUS304TP |
| 316L pipe | A312 TP316L | X2CrNiMo17-12-2 | 1.4404 | G3459 SUS316LTP |
| 321 pipe | A312 TP321 | X6CrNiTi18-10 | 1.4541 | G3459 SUS321TP |
| Duplex 2205 | A790 S32205 | X2CrNiMoN22-5-3 | 1.4462 | G3459 SUS329J3LTP |
| Super duplex 2507 | A790 S32750 | X2CrNiMoN25-7-4 | 1.4410 | |
| Carbon steel | A106 Gr B | EN 10216-2: P265GH | 1.0425 | G3456 STPT410 |
| LTCS | A333 Gr 6 | EN 10216-4: P265NL | 1.0453 | G3460 STPL380 |
| Alloy P11 | A335 P11 | EN 10216-2: 13CrMo4-5 | 1.7335 | G3458 STPA23 |
Seamless or Welded: Choosing the Route for Stainless Steel Pipes and Tubes
| Factor | Seamless | Welded (incl. EFW) |
|---|---|---|
| Typical size range | Small to medium diameter, heavy wall | Light to medium wall; EFW for large diameter |
| Weld seam | None | Longitudinal seam, tested per the standard |
| Common use | High pressure, high temperature, critical and sour service | Utility, water, low to medium pressure process lines |
| Cost | Higher | Lower for the same size |
| Wall uniformity | Wider tolerance | Tighter, from rolled plate or strip |
More detail: seamless vs welded stainless steel pipe.
Industrial Pipes and Tubes in GCC and Export Applications
| Sector | Service conditions | Families usually specified | More |
|---|---|---|---|
| Upstream oil and gas, sour gas fields | H2S, CO2, produced water | CS to NACE MR0175, duplex, super duplex, Alloy 625, 825 | Oil and gas |
| Refining | High temperature, hydrogen, sulphur | A106, P5, P9, P11, P22, 321, 347 | Refinery |
| Petrochemicals | Process chemistry, heat | 304L, 316L, 321, alloy steel | Petrochemical |
| Chemicals and fertilizer | Acids, ammonia, urea | 316L, 317L, 904L, Alloy 20 | Chemical processing |
| Offshore | Seawater, splash zone | Duplex, super duplex, cupro-nickel | Marine and offshore |
What Sets the Price of SS Pipes and Tubes
Prices move with nickel, chrome, molybdenum and steel markets, so no price list is published. The quotation depends on:
- Grade and heat chemistry
- Size, wall and length
- Quantity
- Ex-stock material or a mill order
- Seamless, welded or EFW route
- EN 10204 3.1 or 3.2 certification
- Third party inspection
- Sour service, IGC or impact testing
- Incoterm and destination port
Inspection, Certificates and PMI on Every Pipes and Tubes Order
- EN 10204 3.1 mill test certificate, traceable to heat number
- EN 10204 3.2 with BV, SGS or TÜV witnessing
- PMI on request, worth specifying where 304 and 316, or 316 and 317L, are on the same order
- Intergranular corrosion testing to ASTM A262 on request
- Hydrostatic or NDE testing as the product standard requires
See certificates.
Packing Pipes and Tubes for Sea Freight and GCC Site Laydown
Lead time is confirmed at quotation.
- End caps on plain ends, bevel protectors on bevelled ends
- Pipe bundled and strapped; tube and small bore in wooden crates
- Varnish or temporary coating on carbon and alloy steel
- Stainless and nickel alloys kept apart from carbon steel
- Grade and heat number marked on each length and package
- 5.8 m and 11.8 m lengths for 20 ft and 40 ft containers
High ambient heat and UV break down plastic caps during long laydown in the GCC, and coastal chlorides can pit 304 left uncovered. Store off the ground and covered. More on packing and dispatch.
Fittings and Flanges to Complete Your Pipes and Tubes System
| Pipe family | Fittings | Flanges |
|---|---|---|
| Carbon steel | A234 WPB | A105 |
| LTCS | A420 WPL6 | A350 LF2 |
| Alloy steel | A234 WP grades | A182 F grades |
| Stainless | A403 WP304, WP316 | Stainless steel flanges |
| Duplex, super duplex | Duplex fittings, super duplex fittings | Duplex and super duplex flanges |
| Nickel alloys | Inconel, Hastelloy, Monel | Nickel alloy flanges |
All: pipe fittings, flanges.
Send Your Pipes and Tubes Enquiry
Attach your material specification with the grade, size, quantity and destination port, and the quotation will be priced against it. Pipe, tube, fittings and flanges can be quoted on one enquiry.
Request a quotationFAQ: Pipes and Tubes
Pipe is ordered by nominal size and schedule, and its OD differs from the nominal size. Tube is ordered by actual OD and wall thickness, with tighter tolerances.
Carbon steel with hardness control, and stainless, duplex and nickel alloys within the environmental limits of ISO 15156 Part 3. HIC or SSC testing availability is confirmed at quotation.
Yes. EN 10204 3.1 is standard, and 3.2 can be arranged with BV, SGS or TÜV.
Pipe can be cut to 5.8 m for 20 ft containers or 11.8 m for 40 ft containers, or supplied in random or fixed lengths to order.
Grade, standard, OD, wall thickness, length, quantity, end finish, certification, inspection requirement, destination port and required date.
Not in every case. Seamless pipe has no weld seam and is preferred for high pressure, high temperature and sour service. Welded pipe holds tighter wall tolerance and costs less in larger diameters, so it suits utility and lower pressure lines.
NPS (inches) and NB are used for the same nominal size; DN is the metric equivalent. Up to NPS 12, the nominal size is not the actual OD, so confirm OD from the dimension chart.
The schedule sets wall thickness for a given nominal size. OD stays the same, so a higher schedule gives a thicker wall and a smaller bore.
Yes. We ship from Mumbai to the GCC and other export markets on CIF terms, with export packing and full documentation.
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