Stainless Steel Tubes Supplier & Exporter
The stainless steel tubes are commonly used in industries where corrosion resistance, durability, and strength are very important. Metinox overseas is a trusted manufacturer and supplier of high quality Stainless steel tubes that are used in the demanding food processing and construction industries as well as chemical processing or in oil and gas. These tubes are made of high-grade alloys that include ASTM A213, ASTM A269, and ASTM A312 which provide great resistance to oxidation pressure, and temperature changes. Stainless steel tubes are frequently used in heat exchangers, fluid transport systems, and structural components because this material has a smooth finish surface and good structural integrity. Stainless steel tubes are a critical component of modern industrial use because of their combination of a long lifespan, hygienic characteristics, and mechanical strength.
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Types of Stainless Steel Tubes
We manufacture and supply a full variety of stainless steel tubing, all designed to meet a particular service condition, pressure rating, dimensional tolerance, and industry use. The types are all offered in a variety of grades that are completely certified to ASTM / ASME / EN.
Stainless Steel 304 Tubes
Stainless Steel 304L Tubes
Stainless Steel 304H Tubes
Stainless Steel 310S Tubes
Stainless Steel 310H Tubes
Stainless Steel 316/316L Tubes
Stainless Steel 316H Tubes
Stainless Steel 316Ti Tubes
Stainless Steel 317/317L Tubes
Stainless Steel 321/321H Tubes
Stainless Steel 347/347H Tubes
Stainless Steel 904L Tubes
Stainless Steel Seamless Tubes — ASTM A213 / A269
The stainless steel is made using two methods, one is cold-drawn, and another is hot-finished, which are made up of hot-finished billets with no weld seam and provide a proper thickness
Stainless Steel Welded Tubes — ASTM A249 / A269 / A554
Stainless steel welded tubes are made with the help of precision-rolled strips, which are TIG-welded without filler metal and sized or drawn to the current OD and wall tolerance. They provide low-to-moderate pressure and general corrosion service as an alternative with a more economical alternative to seamless tubes with excellent dimensional consistency and surface finish.
Stainless Steel Square Tubes — ASTM A554
The stainless steel round tubes are also used in many industries, such as process piping, instrumentation, heat exchangers, architectural handrails and buildings and are supplied in seamless and welded types. They are in an OD range continuous between 3mm and 508mm and a wall thickness of 0.5mm to 20mm. and pressure along the entire length. High-pressure instrumentation lines, boiler service, heat-exchanger tubes, and applications of critical processes must be built seamlessly.
Stainless Steel Square Tubes — ASTM A554
Stainless square tubes are welded stainless steel tubes, which are made in a square profile, mainly used in the fields of structure, architecture, and mechanical. The standard specification of facades, balustrades, handrail systems, machine frames and ornamental building features is grade 304 and 316. Unrated to pressure service.
Stainless Steel Rectangular Tubes — ASTM A554
Stainless steel rectangular tubes are produced by the same process as square tubes and are applied in structural framing, support columns, conveyor systems and architectural features that need to have aspect ratios other than square.
Stainless Steel Capillary Tubes — ASTM A269
Stainless steel capillary tubes are made in very small-diameter, thin-wall precision tubes that are used in many medical devices, scientific instruments, thermocouples, hydraulic systems, and fluid-sampling applications. They are made with the cold-drawn techniques with extremely tight OD and wall tolerances with a clean, smooth bore.
316 Stainless Steel Tubes
The 316 stainless steel tubes are made up of 2-3 % molybdenum to the base of the 18/8 austenitic, giving it the highest pitting and crevice corrosion resistance of the standard grades. Preferred tube specifications are used in marine, offshore, pharmaceutical, food, and chemical process applications, where usage of chloride-bearing media, saline fluids, and corrosive process streams is involved.
Available in: Seamless (ASTM A213, A269) | Welded (ASTM A249, A269, A554) | Square/Rectangular (ASTM A554) Size range: 3 mm OD to 508 mm OD Common specifications: 316 / 316L (dual-certified) | 316H (high-carbon, elevated-temp service)
SS Seamless Tubing — Instrumentation & Hydraulic
SS instrumentation and hydraulic service Seamless tubing is precision cold-drawn to form the tightest OD tolerances (usually within ± 0.05 mm) and a bore finish that is both smooth as possible and the finest available. Applications used in hydraulic control systems, pneumatics, thermowell assemblies, sample lines, and gas-chromatography tubing.
Grades: 304, 316, 316L Standard: ASTM A269 | ASTM A213 OD range: 3 mm to 25 mm | Wall: 0.5 mm to 3 mm Length: Coil (standard) | Straight 6 m lengths | Cut-to-length
Stainless Steel Tube Fittings — Compression & Socket Weld
Metinox Overseas supplies stainless steel tube fittings and stainless steel socket weld fittings to complement our tube range. These include compression fittings, ferrule fittings, socket weld fittings, and bite-type fittings for instrumentation and hydraulic systems in grades 304 and 316.
Available Grades for Stainless Steel Tubes
Metinox stocks and supplies stainless steel tubes across all major austenitic, duplex, and super-austenitic grades. Below is a full chemical composition and application reference.
CHEMICAL COMPOSITION TABLE OF SS TUBE GRADES
| Grade | UNS No. | C % Max | Cr % | Ni % | Mo % | Other | Key Property |
|---|---|---|---|---|---|---|---|
| 304 | S30400 | 0.08 | 18.0–20.0 | 8.0–11.0 | — | — | General corrosion resistance; most widely used |
| 304L | S30403 | 0.035 | 18.0–20.0 | 8.0–13.0 | — | — | Low-carbon; weld sensitisation-free |
| 304H | S30409 | 0.04–0.10 | 18.0–20.0 | 8.0–11.0 | — | — | High-carbon; creep strength at elevated temp |
| 316 | S31600 | 0.08 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | — | Mo addition; pitting & crevice resistance |
| 316L | S31603 | 0.035 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | — | Low-carbon 316; pharmaceutical and marine |
| 316H | S31609 | 0.04–0.10 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | — | High-carbon; elevated-temp pressure service |
| 317L | S31703 | 0.035 | 18.0–20.0 | 11.0–15.0 | 3.0–4.0 | — | Higher Mo; stronger acid resistance |
| 321 | S32100 | 0.08 | 17.0–19.0 | 9.0–12.0 | — | Ti ≥ 5×C | Ti-stabilised; high-temp sensitisation resistant |
| 321H | S32109 | 0.04–0.10 | 17.0–19.0 | 9.0–12.0 | — | Ti ≥ 4×C | Creep-range boiler and superheater service |
| 347 | S34700 | 0.08 | 17.0–19.0 | 9.0–13.0 | — | Nb+Ta ≥ 10×C | Nb-stabilised; oxidation resistant to 870°C |
| 347H | S34709 | 0.04–0.10 | 17.0–19.0 | 9.0–13.0 | — | Nb+Ta ≥ 8×C | High-temp boiler and superheater tubing |
| 310S | S31008 | 0.08 | 24.0–26.0 | 19.0–22.0 | — | — | Oxidation resistant to 1100°C |
| Duplex 2205 | S32205 | 0.030 | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 | N 0.08–0.20 | 2× yield strength; SCC resistant |
| Super Duplex 2507 | S32750 | 0.030 | 24.0–26.0 | 6.0–8.0 | 3.0–5.0 | N 0.24–0.32 | PREN > 40; seawater resistant |
| 904L | N08904 | 0.020 | 19.0–23.0 | 23.0–28.0 | 4.0–5.0 | Cu 1.0–2.0 | Super-austenitic; H₂SO₄ & HCl resistant |
MECHANICAL PROPERTIES OF SS TUBE GRADES
| Grade | Tensile Strength Min (MPa) | Yield Strength Min (MPa) | Elongation Min % | Hardness Max (HRB) |
|---|---|---|---|---|
| 304 / 304L | 515 | 205 | 35 | 92 |
| 316 / 316L | 515 | 205 | 35 | 92 |
| 317L | 515 | 205 | 35 | 95 |
| 321 / 321H | 515 | 205 | 35 | 92 |
| 347 / 347H | 515 | 205 | 35 | 92 |
| 310S | 515 | 205 | 35 | 95 |
| Duplex 2205 | 620 | 450 | 25 | 31 HRC |
| Super Duplex 2507 | 795 | 550 | 15 | 32 HRC |
Sizes & Standards of Stainless Steel Tubes
The Metinox stainless steel tubes are ASTM, ASME, EN, and JIS-conforming in addition to DIN. All orders come with standard Mill test certificates to EN 10204 3.1, which can be third-party checked on request.
STANDARDS REFERENCE TABLE
| Standard | Full Title | Tube Type | Key Grades |
|---|---|---|---|
| ASTM A213 / ASME SA213 | Seamless Ferritic & Austenitic Alloy-Steel Boiler, Superheater & HE Tubes | Seamless | T304, T316, T321, T321H, T347, T347H, T310S |
| ASTM A269 / ASME SA269 | Seamless & Welded Austenitic SS Tubing — General Service | Seamless & Welded | 304, 304L, 316, 316L, 321, 347 |
| ASTM A249 / ASME SA249 | Welded Austenitic SS Boiler, Superheater, HE & Condenser Tubes | Welded | TP304, TP304L, TP316, TP316L, TP321, TP347 |
| ASTM A554 | Welded SS Mechanical Tubing | Welded — Structural | 304, 316, 409, 430 |
| ASTM A270 / ASME SA270 | Seamless & Welded Austenitic SS Sanitary Tubing | Seamless & Welded | 304, 316L |
| ASTM A511 | Seamless SS Mechanical Tubing | Seamless — Mechanical | 304, 316, 321 |
| EN 10216-5 | Seamless Steel Tubes for Pressure Purposes — SS | Seamless | 1.4301, 1.4401, 1.4571 |
| EN 10217-7 | Welded Steel Tubes for Pressure Purposes — SS | Welded | 1.4301, 1.4404, 1.4571 |
| EN 10296-2 | Welded Circular Steel Tubes for Mechanical & General Engineering — SS | Welded | 1.4301, 1.4401 |
| JIS G3463 | SS Tubes for Boilers & Heat Exchangers | Seamless & Welded | SUS304, SUS316, SUS321 |
SIZE RANGE REFERENCE TABLE
| Tube Type | OD Range | Wall Thickness Range | Length | Standard |
|---|---|---|---|---|
| Seamless round tube (small) | 3 mm – 50 mm OD | 0.5 mm – 5 mm | Coil / Straight | A213, A269 |
| Seamless round tube (large) | 50 mm – 168 mm OD | 2 mm – 20 mm | 6 m / Custom | A213, A269 |
| Welded round tube | 6 mm – 508 mm OD | 0.5 mm – 12 mm | 6 m / Custom | A249, A269, A554 |
| Square tube | 10×10 mm – 200×200 mm | 1 mm – 10 mm | 6 m / Custom | A554, EN 10219-1 |
| Rectangular tube | 10×20 mm – 100×200 mm | 1 mm – 8 mm | 6 m / Custom | A554, EN 10219-1 |
| Capillary tube | 0.5 mm – 12 mm OD | 0.05 mm – 2 mm | Coil / Straight | A269, EN 10216-5 |
| Sanitary / hygienic tube | 6 mm – 168 mm OD | 1 mm – 4 mm | 6 m / Custom | A270, DIN 11850 |
| Instrumentation tube | 3 mm – 25 mm OD | 0.5 mm – 3 mm | Coil / 6 m | A269, A213 |
TOLERANCE TABLE — ASTM A269 SEAMLESS & WELDED TUBES
| Parameter | Tolerance (Cold-Finished) |
|---|---|
| Outside Diameter (OD ≤ 25 mm) | ± 0.10 mm |
| Outside Diameter (OD > 25 mm) | ± 0.40% |
| Wall Thickness — under tolerance | −10% of nominal (A269) / −12.5% (A213) |
| Straightness | 3 mm per 1,500 mm |
| Length (standard) | +6 mm / −0 mm |
SURFACE FINISH OPTIONS
| Finish | Description | Typical Application |
|---|---|---|
| Annealed & Pickled (AP / No.1) | Mill finish; scale-free; dull silver | General industrial, structural |
| Bright Annealed (BA) | Mirror-bright; no scale; no pickling required | Instrumentation, capillary, food |
| No.4 Satin Polish | Linear brushed finish; Ra 0.4–0.8 µm | Architectural, food equipment |
| Electropolished (EP) | Ultra-smooth; Ra ≤ 0.4 µm; enhanced corrosion resistance | Pharmaceutical, bioreactor |
| Mirror / No.8 Polish | Highly reflective | Decorative, architectural |
Applications of Stainless Steel Tubes
Stainless steel tubes from Metinox Overseas are used across the most demanding global industries, wherever precise dimensions, corrosion resistance, and reliable mechanical properties are essential.
Heat Exchangers & Condensers ASTM A213 and A249 seamless and welded tubes in grades 304, 316, 321, and 347 for shell-and-tube heat exchangers, condensers, reboilers, and air-cooled heat exchangers in refineries, chemical plants, and power stations.
Boilers & Superheaters ASTM A213 TP321H and TP347H seamless boiler tubes for superheater coils, reheater circuits, economiser banks, and feedwater heater bundles in thermal power plants.
Instrumentation & Hydraulic Systems ASTM A269 TP316L seamless, bright-annealed instrumentation tubes for hydraulic control circuits, pneumatic systems, thermowell assemblies, sample lines, and pressure-gauge impulse lines.
Pharmaceutical & Biotechnology ASTM A270 TP316L electropolished tubes for WFI water loops, clean steam distribution, CIP/SIP systems, bioreactor connections, and sterile fill-and-finish lines compliant with FDA 21 CFR and ASME BPE.
Food & Beverage Processing 304 and 316L sanitary tubes with bright-annealed or electropolished bore for dairy pasteurisation, brewery fermentation circuits, juice processing, beverage transfer, and CIP cleaning loops.
Stainless Steel Tube Fittings & Assemblies 316L seamless instrumentation tubes paired with compression stainless steel tube fittings and stainless socket weld fittings for leak-free, high-integrity hydraulic and instrument manifold assemblies in process plants.
Marine & Offshore 316L and super duplex 2507 seamless tubes for seawater heat exchangers, oil coolers, and offshore platform instrumentation bundled lines — where chloride resistance is mandatory.
Oil & Gas — Downhole & Process 316L and 317L seamless tubes for chemical injection lines, thermowells, umbilical bundles, and heat-exchanger service in refineries, gas processing plants, and floating production units.
Medical Devices & Scientific Instruments 316L stainless steel capillary tubes in bright-annealed finish for hypodermic needles, medical implants, chromatography columns, thermocouple sheaths, and sensor probes.
Construction & Architecture ASTM A554 304 and 316 stainless steel round tubes and stainless square tubes for building facades, balustrade systems, handrails, curtain wall mullions, structural columns, and decorative architectural features.
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FAQs About Stainless Steel Tubes
A stainless steel tube is specified by exact outside diameter (OD) and wall thickness in mm, optimised for precision instrumentation, heat transfer, structural, and hygienic applications where tight dimensional tolerances matter. A stainless steel pipe is specified by nominal pipe size (NPS) and schedule — a conventional sizing system for fluid conveyance and process piping. Metinox supplies both stainless steel tubes and pipes across all major grades and standards.
ASTM A213 covers seamless ferritic and austenitic alloy-steel tubes specifically for boiler, superheater, and heat-exchanger service — minimum wall thickness specification, high-temperature grades (321H, 347H) included. ASTM A269 covers both seamless and welded austenitic stainless steel tubing for general corrosion-resisting and low- or high-temperature service — nominal wall thickness, broader size range, and instrumentation use. A213 is the boiler and pressure specification; A269 is the general-service and instrumentation specification.
SS 304 tube offers excellent general corrosion resistance and is the standard choice for food, pharmaceutical, water, and general industrial applications. 316 stainless steel tube adds 2–3% molybdenum which provides significantly enhanced resistance to pitting and crevice corrosion in chloride-bearing environments — marine, offshore, chemical processing, and pharmaceutical applications involving saline media. For welded tubes, always specify 304L or 316L (low-carbon) to prevent weld sensitisation.
Stainless steel seamless tubes are available from 3 mm OD to 168 mm OD with wall thickness from 0.5 mm to 20 mm per ASTM A213 and A269. SS seamless tubing for instrumentation is typically supplied in OD 3 mm to 25 mm with walls from 0.5 mm to 3 mm in coil or straight lengths. For larger OD (up to 273 mm), ASTM A213 seamless boiler tubes are available in straight lengths. Custom OD and wall combinations can be cold-drawn to order.
Stainless steel capillary tubes are very small-diameter precision tubes (OD typically 0.5 mm to 12 mm, wall 0.05 mm to 2 mm) used in medical devices (hypodermic needles, catheters), scientific instruments (chromatography columns, thermocouples), hydraulic control systems, sample-line assemblies, and pressure sensors. They are cold-drawn to very tight tolerances and supplied in bright-annealed (BA) finish per ASTM A269. Grade 316L is specified for medical and pharmaceutical applications; 304 for general instrument service.
Both stainless square tubes and stainless steel round tubes per ASTM A554 are welded structural profiles — the choice depends on the structural and aesthetic requirement. Square tubes offer better resistance to bending in two axes and flat faces that simplify bracket and face-to-face welding connections. Round tubes offer better torsional resistance and a cleaner aesthetic for handrails, balustrades, and architectural features. Both are available in grade 304 (economy) and 316 (corrosion-critical or coastal) with No.4 or mirror-polished finish.
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