SS Tube Manufacturer in India

SS tubes carry fluid, steam and gas through plants where carbon steel would rust, leak or soften under heat. Metinox Overseas manufactures and exports seamless and welded stainless steel tubes in austenitic grades (304/304L, 316/316L, 321, 347), super duplex 2507 and high-nickel 904L. Seamless tubes run from 3.175 mm to 101.6 mm OD, welded tubes from 6.35 mm to 152.4 mm OD, with wall thicknesses from 0.5 mm to 5.6 mm. Our austenitic tubes are made to ASTM A213 or ASTM A269, and the right grade for your line depends on its pressure, temperature and chloride content. Sizes, grades and full specifications are below, so you can narrow down what you need before requesting a quote.

Ready with your size and quantity? Send us the grade, form and size and we will quote against it.

Request a Quote on Stainless Steel Tubes →

Stainless Steel Tubes We Supply
Tables: Specification, Composition, Sizes & Grades
Types of SS Tubes
Where SS Tubes Are Used
Frequently Asked Questions

Stainless Steel Tubes We Supply: Grades and Forms from an SS Tubes Manufacturer in India

As one of the SS tubes manufacturers in India that ship to overseas buyers, we keep the range simple. You tell us the grade, the form and the size, and we quote against that. As a stainless steel tubes supplier we cover the families below, and each has its own page with full detail.

stainless steel 304 tube, the general purpose grade for food, water and light chemical duty.
316L stainless steel tube, for coastal, marine and chloride bearing process lines.
321 stainless steel tube and 347 stainless steel tube, for heater, boiler and exhaust lines running hot.
904L stainless steel tube and super duplex stainless steel tube, for strong acids and heavy chloride exposure.
stainless steel square tube in welded form, for frames, handrails and structural work.

Looking for larger bore lines instead? See our stainless steel pipes.

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

Types of SS Tubes and Stainless Steel Square Tubing Sizes Chart

Round tube is the everyday form. Square and rectangular tubes are welded and polished, and are used where appearance and stiffness matter more than pressure. U bend tubes are formed to order for heat exchangers, and coiled tube is supplied in long lengths for instrument and control lines. Square and rectangular sections follow ASTM A554.

Stainless Steel Tube Specification

Most SS tubes are bought against one of four standards. ASTM A213 covers seamless tubes for boilers, superheaters and heat exchangers. ASTM A269 covers seamless and welded tubes for general corrosion and heat service. ASTM A249 covers welded tubes for the same duties, and ASTM A554 covers welded mechanical tubing such as square and rectangular sections.

Specification	Detail
Standards	ASTM A213 / ASME SA213; ASTM A269; ASTM A249; ASTM A554 for square and rectangular
Grades	304, 304L, 304H, 316, 316L, 321, 347, 904L, 2507
Types	Seamless and welded; round, square, rectangular, U bend and coiled
Seamless tube size	3.175 mm OD to 101.6 mm OD
Welded tube size	6.35 mm OD to 152.4 mm OD
Wall thickness	0.020" - 0.220" (special wall thicknesses available)
Length	Single random, double random or cut length
Condition	Solution annealed and pickled, or bright annealed
Finish	Annealed and pickled, bright annealed, mechanically polished
Ends	Plain, bevelled on request
Tolerances	Dimensions per ASTM A1016
Certificates	EN 10204 3.1 mill test certificate; 3.2 on request

SS Tube Chemical Composition

Grade	C	Cr	Ni	Mo	Other
304	0.08	18.0 to 20.0	8.0 to 11.0	-	-
316L	0.035	16.0 to 18.0	10.0 to 14.0	2.0 to 3.0	-
321	0.08	17.0 to 19.0	9.0 to 12.0	-	Ti 5 x (C+N) min, 0.70 max
347	0.08	17.0 to 19.0	9.0 to 13.0	-	Nb 10 x C min, 1.00 max
904L	0.020	19.0 to 23.0	23.0 to 28.0	4.0 to 5.0	Cu 1.0 to 2.0
Super duplex 2507	0.030	24.0 to 26.0	6.0 to 8.0	3.0 to 5.0	N 0.24 to 0.32

Stainless Steel Tube Mechanical Properties

Grade	Tensile min (MPa)	Yield min (MPa)	Elongation min (%)
304	515	205	35
316L	485	170	35
321	515	205	35
347	515	205	35
904L	490	215	35
Super duplex 2507	795	550	15

Seamless vs Welded SS Tubes: Pressure, Size and Finish

Seamless tubes are drawn from a solid billet and have no seam. Welded tubes are rolled from strip, joined along the length and then annealed. Both are good tubes, and the choice usually comes down to pressure and budget.

Point	Seamless SS tube	Welded SS tube
Pressure duty	Higher, no weld seam to limit it	Good for moderate pressure; allowable stress is reduced by a weld joint factor
Size range	Smaller to medium diameters, up to about 101.6 mm	Wider range, extends to larger diameters
Wall and finish	Wall can vary slightly; drawn finish is smooth	Very even wall; bright finish is easy to achieve
Cost	Higher	Lower
Typical use	Boilers, heat exchangers, steam, hydraulic lines	Food, dairy, pharma, water, handrails, structural

Browse the seamless stainless steel tube and welded stainless steel tube pages for forms and grades in each.

Stainless Steel Square Tubing Sizes Chart

Common square sections in 304 and 316. Weights use a density of 7.93 g/cm³ and ignore corner radius, so real weights run a little lower. Other sizes can be made on request. Our stainless steel square tube page has the full list.

Size (mm)	Wall (mm)	Weight (kg/m)
10 x 10	1.0	0.29
15 x 15	1.2	0.53
20 x 20	1.5	0.88
25 x 25	1.5	1.12
30 x 30	2.0	1.78
40 x 40	2.0	2.41
50 x 50	2.0	3.05
50 x 50	3.0	4.47
60 x 60	3.0	5.42
80 x 80	3.0	7.33

SS Tube Size Chart in mm: OD, Wall Thickness and Weight

This stainless steel tube size chart in mm lists common outside diameters with their walls, inch equivalents and weight per metre. Weights use 304 and 316 density; for 316L add roughly 0.6%, and for duplex deduct about 2%. For a size not shown, use weight in kg per metre = 0.02491 x wall x (OD minus wall), with both in mm. A 6 metre length of 25.4 mm OD by 1.65 mm wall tube weighs about 6 kg.

OD (mm)	OD (inch)	Wall (mm)	Wall (inch)	Weight (kg/m)
6.35	1/4	0.89	0.035	0.12
6.35	1/4	1.24	0.049	0.16
9.53	3/8	1.24	0.049	0.26
9.53	3/8	1.65	0.065	0.32
12.70	1/2	1.24	0.049	0.35
		1.65	0.065	0.45
		2.11	0.083	0.56
15.88	5/8	1.65	0.065	0.58
15.88	5/8	2.11	0.083	0.72
19.05	3/4	1.65	0.065	0.72
		2.11	0.083	0.89
		2.77	0.109	1.12
25.40	1	1.65	0.065	0.98
		2.11	0.083	1.22
		3.05	0.120	1.70
31.75	1 1/4	2.11	0.083	1.56
		2.77	0.109	2.00
		3.40	0.134	2.40
38.10	1 1/2	2.11	0.083	1.89
		2.77	0.109	2.44
		3.40	0.134	2.94
50.80	2	2.77	0.109	3.31
		3.40	0.134	4.01
		4.06	0.160	4.73
63.50	2 1/2	2.77	0.109	4.19
63.50	2 1/2	3.40	0.134	5.09
76.20	3	3.05	0.120	5.56
76.20	3	3.76	0.148	6.78
88.90	3 1/2	3.05	0.120	6.52
88.90	3 1/2	4.19	0.165	8.84
101.60	4	3.05	0.120	7.49
101.60	4	4.19	0.165	10.17

ASTM A213 Stainless Steel Tube Grades and How to Choose the Right One

Grade is a corrosion decision first and a strength decision second. The number that helps most is PREN, the pitting resistance equivalent. It adds up chromium, molybdenum and nitrogen, and a higher figure means better resistance to chloride pitting. Values below are typical and are a guide only.

Grade	UNS	Typical PREN	Choose it when
304 / 304L	S30400 / S30403	About 19	Chloride is low: food, water, general process, indoor use
316 / 316L	S31600 / S31603	About 24	Seaside air, brackish water, mild chlorides, pharma
321	S32100	About 18	Heat above 425°C where 304 would sensitise: boilers, exhaust
347	S34700	About 18	Same heat range as 321, with better stability in welded service
904L	N08904	About 34	Sulphuric and phosphoric acid, hotter chloride duty
Super duplex 2507	S32750	40 or more	Seawater, offshore, high chloride and high strength

Where SS Tubes Are Used: Industries and Applications

Heat exchangers, condensers and coolers in power, refining and chemical plants
Boiler and superheater tubing and steam lines
Food, dairy, beverage and pharmaceutical process lines
Instrumentation and hydraulic lines in oil and gas, offshore and marine work
Desalination, water treatment and shipbuilding
Handrails, frames and architectural work, usually in square and rectangular tube

For quotes and export documents, send us your requirement, or see the export markets we serve.

Get a Quote →

Frequently Asked Questions

SS tubes are measured by outside diameter and wall thickness for structural or precision work. Pipes follow nominal pipe sizes for fluid transport.

The ASTM A213 Stainless Steel Tube specification covers seamless alloy and austenitic steel for high temperature applications like boilers, superheaters, and heat exchangers.

Seamless ss tubes are formed from solid billets for high pressure duty. Welded tubes are made from rolled strip joined along a continuous seam.

Grade 316 stainless steel tubes are best for chloride exposure due to added molybdenum. Grade 304 suits general environments with lower pitting risk.

We offer a full stainless steel square tubing sizes chart along with round profiles. Review our complete ss tube size chart in mm for details.

Multiply outer diameter minus wall thickness by wall thickness and density factor 0.02491. Reference our Stainless Steel Tube Size Chart for exact unit weights.

ASTM A213 covers seamless tubes for high temperature power service. ASTM A269 covers general service seamless and welded stainless steel tubing for corrosion resistance.

Austenitic ss tubes like 304 and 316 are non magnetic in the annealed state. Cold working or welding can introduce slight magnetism.

Grade 304 handles continuous service up to 870°C. Titanium stabilized Grade 321 operates reliably up to 900°C in high temperature heat exchangers.

Yes, as a leading ss tubes manufacturers in india, we supply round, square, and rectangular tubing. Check our product line for custom dimensions.

Every shipment from our facility includes EN 10204 3.1 Mill Test Certificates. All items match our strict Stainless Steel Tube Specification requirements.

Yes, as a global stainless steel tubes supplier, we export high quality tubing worldwide. We handle complete international shipping, documentation, and compliance.

Enquire Now

Get pricing within 24 hours!

SS Tubes Manufacturer in India

Table of Contents