Duplex Steel UNS S31803 Tubes Manufacturer & Supplier
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Midland Alloys Inc., a certified ASTM A789 Duplex Steel S31803 Tubes Manufacturer and Supplier in India, offers high-quality UNS S31803 tubes from Mumbai. Also known as 2205 or EN 1.4462, duplex stainless steel combines high strength and excellent corrosion resistance, making it ideal for tough environments. Our tubes meet ASTM A213 standards and include seamless, welded, and U-bend tubes. S31803 is used in oil & gas, desalination, and chemical industries thanks to its strong chemical compatibility. Compared to S32205, S31803 has slight differences that suit specific needs. With certifications like ASTM A789, PED and ISO 9001, we support international exports. Our main focus is timely delivery, personalization, and quality control.
What are ASTM A213 S31803 Duplex Steel Tubes
ASTM A213 S31803 Duplex Steel Tubes are seamless ferritic-austenitic stainless tubes used in boilers, heat exchangers, and high-pressure systems. The standard guarantees that these tubes fulfill strict specifications for heat performance, strength, and resistance to corrosion. UNS S31803, also known as 1.4462 Duplex 2205 Instrument Tubing, has a balanced microstructure of ferrite and austenite giving it high yield strength and excellent resistance to pitting, cracking and chloride stress corrosion. Its chemical composition, such is rich in chromium, molybdenum, and nitrogen, makes it ideal for oil and gas, chemical plants, and desalination systems
Key Benefits of Duplex Steel S31803 Tubes
Duplex Steel UNS S31803 tubes offer an excellent balance of strength and corrosion resistance, making them suitable for demanding environments. With higher yield strength than austenitic steels, they allow for reduced material thickness and cost savings. Their resistance to stress corrosion cracking, pitting, and crevice corrosion makes them ideal for applications in chemical processing, oil and gas, and marine industries. These tubes also provide good weldability and durability, ensuring long-lasting performance in harsh conditions.
- Excellent pitting and crevice corrosion resistance, even in chloride-rich environments.
- Higher strength-to-weight ratio compared to austenitic stainless steels.
- Maintains good weldability and formability, allowing ease of fabrication.
- Provides long service life in harsh industries like chemical processing, oil & gas, and marine.
- Resists stress corrosion cracking, which is a common failure mode in conventional stainless steels.
SS 304/304L tubes are a go-to choice for general-purpose applications, providing excellent corrosion resistance, weldability, and affordability. Compared to SS 316, which contains molybdenum, 304/304L offers less chloride resistance but comes at a lower cost. SS 321 includes titanium for high-temperature stability but is less weld-friendly than 304L. SS 310 offers excellent high-temp performance but is more expensive. Duplex 202 is more difficult to machine, and form but it offers greater strength and superior resistance to harsh environments. The selection of the appropriate grade depends on the environment, mechanical stress, temperature exposure and cost.
Specification of Duplex Steel S31803 Tubes
Duplex Steel S31803 tubes (UNS S31803 / DIN 1.4462 / 2205) in OD 6 mm to 101.6 mm, wall thickness 0.5 mm to 8 mm, and lengths up to 6 meters. These ASTM A789 and ASTM A213-compliant tubes are offered in seamless, welded, and U-bend forms. Annealed, pickled, and polished finishes are available, along with ends that are threaded, beveled, or plain. We ensure tight tolerances, smooth surface finish, and full traceability with EN 10204 3.1/3.2 certificates. As a DIN 1.4462 Duplex 2205 tube exporter, we also offer ASTM A789 UNS S32205 seamless tubes with reliable quality and fast delivery.
Seamless Tube OD : 1/8 -12" NPS
Welded Tube OD : 6.00 mm OD up to 914.4 mm OD
EFW Tube Size : 1 / 2" NB - 16" NB
ASTM A790 / ASME SA790
Seamless / Welded / ERW / Fabricated / CDW / 100% X Ray Welded
Round, Square, Rectangular, Hydraulic Etc
Single Random, Double Random, Standard & Cut length
Plain Ends (PE), Threaded Ends (TE), Bevelled Ends (BW), Grooved Mechanical Joints or Grooved Ends, TBE (Treaded Both Ends)
SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
No. 2B - Mill finish/ Matte finish, No.8 - Mirror finish, No. 4 - Brushed finish, Bright, Annealing, Polished, Mirror
Types of Duplex Steel UNS 31803 Seamless Tubes
We offer a wide range of Duplex Steel UNS S31803 seamless tubes to suit different pressure, shape, and processing needs. To meet industrial standards and specific applications, these tubes are available in a variety of production and form types.
Manufacturing Types
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SeamlessMade from solid billets, ideal for high-pressure and corrosion-prone environments.
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EFW (Electric Fusion Welded)Used for larger diameters, offers good strength and uniformity.
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ERW (Electric Resistance Welded)Cost-effective and suited for low to medium pressure use.
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CEW (Cold Electric Welded)Offers tighter dimensional control and a smooth surface finish.
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CDW (Cold Drawn Welded)Provides high precision and enhanced mechanical properties.
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LSAW (Longitudinal Submerged Arc Welded)Good for heavy-duty structural or pipeline work.
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FabricatedCustom-built to specific dimensions for unique project requirements.
Pipe Forms
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Round TubesMost common, used in pipelines, marine, and structural applications
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Square TubesOften used in construction and framework due to better corner strength.
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Rectangular TubesIdeal for space-saving layouts in machinery or structural use.
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Oval TubesUsed where aesthetic and flow characteristics matter, such as railings.
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Coil TubesSuitable for continuous piping runs and heat exchanger loops.
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U TubesShape: Used in boilers and heat exchangers for tight bends.
Hydraulic & Honed Tubes: Precision tubes for hydraulic systems and high-pressure fluid flow.
Contact us today to discuss how Duplex Steel UNS 31803 Seamless Tubes Tubes can benefit your application. Whether you need guidance in selecting the right Tubes or have specific requirements, our team of experts is here to help you find the optimal solution.
Technical Details & Delivery Condition
Duplex 2205 seamless tubes provide excellent elongation for flexible design requirements and strong strength for structural loads. They are suitable for oil and gas, desalination, and chemical plants due to their corrosion resistance; however, it is not suitable for hot, strong acids.
| Cr | Mo | Mn | Si | C | N | S | P | Fe | ||
| MIN | 4.5 | 22.0 | 3.0 | – | – | – | 0.14 | – | – | – |
| MAX | 6.5 | 23.0 | 3.5 | 2.0 | 1.0 | 0.03 | 0.2 | 0.02 | 0.03 | Balance |
| STANDARD | WERKSTOFF NR. | UNS |
|---|---|---|
| Alloy 2205 Pipe | 1.4462 / 1.4462 | S31803 / S32205 |
Mechanical properties are paramount for design safety, long-term durability and stress capacity. Designers use parameters such as tensile strength, yield strength, elongation, and hardness to choose appropriate tubing. Our 304 and 304L stainless steel tubes comply with ASTM A312 and A249 standards, ensuring dependable strength and flexibility. Important properties include minimum tensile strength, yield strength, elongation percentage and maximum hardness
| Grades | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| SS 304 | 8.0 g/cm3 | 1400 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
| SS 304L | 8.0 g/cm3 | 1400 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
Tube weight is important for load analysis, logistics planning, and procurement decisions. Our weight chart makes it possible to estimate the total material weight in terms of outer diameter, wall thickness and length. The numbers comply with ASTM standards and industry regulations, and assist engineers and procurement departments in planning for fabrication and transportation accurately.
| Stainless Steel Tube Size and Weight | ||||||||||||
| Wall Thickness in mm | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.2 | 1.6 | 2 | 2.6 | 3 | 3.2 | 3.6 |
| O. D. in mm Weight in kg/m | ||||||||||||
| 6 | 0.069 | 0.081 | 0.093 | 0.104 | 0.125 | 0.144 | 0.176 | – | – | – | – | – |
| 10 | 0.119 | 0.141 | 0.163 | 0.184 | 0.225 | 0.264 | 0.336 | – | – | – | – | – |
| 12.7 | 0.153 | 0.182 | 0.21 | 0.238 | 0.293 | 0.345 | 0.444 | – | – | – | – | – |
| 14 | 0.169 | 0.201 | 0.233 | 0.264 | 0.325 | 0.384 | 0.496 | – | – | – | – | – |
| 15.87 | 0.192 | 0.229 | 0.266 | 0.301 | 0.372 | 0.44 | 0.571 | 0.694 | – | – | – | – |
| 19 | 0.231 | 0.276 | 0.32 | 0.364 | 0.45 | 0.534 | 0.696 | 0.85 | 1.066 | 1.2 | 1.264 | – |
| 25 | 0.306 | 0.366 | 0.425 | 0.484 | 0.6 | 0.714 | 0.936 | 1.15 | 1.456 | 1.65 | 1.744 | 1.926 |
| 25.4 | 0.311 | 0.372 | 0.432 | 0.492 | 0.61 | 0.726 | 0.952 | 1.17 | 1.482 | 1.68 | 1.776 | 1.962 |
| 31.8 | – | – | – | – | – | 0.918 | 1.208 | 1.49 | 1.898 | 2.16 | 2.288 | 2.538 |
| 38 | – | – | – | – | – | 1.104 | 1.456 | 1.8 | 2.301 | 2.625 | 2.784 | 3.096 |
| 44.5 | – | – | – | – | – | 1.299 | 1.716 | 2.125 | 2.724 | 3.113 | 3.304 | 3.681 |
| 50.8 | – | – | – | – | – | – | 1.968 | 2.44 | 3.133 | 3.585 | 3.808 | 4.248 |
| 63.5 | – | – | – | – | – | – | 2.476 | 3.075 | 3.959 | 4.538 | 4.824 | 5.391 |
| 76.1 | – | – | – | – | – | – | 2.98 | 3.705 | 4.778 | 5.483 | 5.832 | 6.525 |
| 101.6 | – | – | – | – | – | – | 4 | 4.98 | 6.435 | 7.395 | 7.872 | 8.82 |
| 114.3 | – | – | – | – | – | – | 4.453 | 5.547 | 7.173 | 8.247 | 8.78 | 9.84 |
| 127 | – | – | – | – | – | – | 4.955 | 6.175 | 7.989 | 9.188 | 9.785 | 10.98 |
| 152.4 | – | – | – | – | – | – | 5.96 | 7.429 | 9.62 | 11.07 | 11.792 | 13.231 |
For high-temperature and high-pressure systems, stainless steel tubes’ physical and thermal properties are essential. For weight and structural stress calculations, the density of SS 304 and 304L, it should be approximately 7.93 g/cm³. Their melting temperature is between 1400–1450 °C, allowing for high-temperature applications such as heat exchangers and furnace components. Thermal conductivity is approximately 16.2 W/m·K at 100°C and will assist in accurate heat transfer designs. The thermal expansion coefficient is about 17.2 × 10⁻⁶/°C in the 0–100°C range, a consideration of great relevance in designing systems, that undergo thermal cycling. These values follow ASTM A480 and EN material standards.
The price of stainless steel 304 and 304L tubes in India ranges from ₹250 to ₹350 per Kg, depending on size, wall thickness, surface finish, and order volume. Mirror-polished or thick-walled variants may cost more. Prices also fluctuate with market demand and raw material availability. For the most accurate and competitive quote, buyers should reach out directly to Midland Alloys. Based in Mumbai, we maintain ready stock and offer fast delivery nationwide.
SS 304 and 304L tubes offer excellent resistance to corrosion in oxidising and mild reducing environments. Their resistance to moisture, various acids, alkalis and cleaning agents makes them appropriate for use in food-grade, chemical, and marine applications. It don’t rust easily, even in environments that are acidic or rich in chlorides, and can withstand oxidation at high temperatures. For example, they perform well in food processing plants using acidic cleaners or marine setups with salty air exposure.
Stainless Steel Tubes Grades We Offer
Stainless Steel 304 Pipe Schedule
Pipe schedule indicates wall thickness. Common types like SCH 10, 40, 80 define pressure and flow capacity.
| NB | OD | SCH XXS | SCH 80S | SCH 5S | SCH 160S | SCH 10S | SCH 40S | |||||||
| mm | in. | mm | WT (mm) | Weight (kg/m) | WT (mm) | Weight (kg/m) | Weight (kg/m) | WT (mm) | Weight (kg/m) | WT (mm) | WT (mm) | Weight (kg/m) | WT (mm) | Weight (kg/m) |
| 10 | 3/8 | 17.1 | – | – | 3.20 | 1.10 | 0.490 | 1.24 | – | – | 1.65 | 0.63 | 2.31 | 0.845 |
| 25 | 1 | 33.4 | 9.09 | 5.45 | 4.55 | 3.24 | 1.30 | 1.65 | 4.24 | 6.35 | 2.77 | 2.09 | 3.38 | 2.50 |
| 150 | 6 | 168.3 | 21.95 | 79.22 | 10.97 | 42.7 | 11.32 | 2.77 | 67.56 | 18.2 | 3.40 | 13.84 | 7.11 | 28.3 |
| 15 | 1/2 | 21.3 | 7.47 | 2.55 | 3.75 | 1.62 | 0.800 | 1.65 | 1.94 | 4.75 | 2.11 | 1.00 | 2.77 | 1.27 |
| 40 | 1 1/2 | 48.3 | 10.16 | 9.54 | 5.08 | 5.41 | 1.91 | 1.65 | 7.25 | 7.14 | 2.77 | 3.11 | 3.68 | 4.05 |
| 32 | 1 1/4 | 42.2 | 9.70 | 7.77 | 4.85 | 4.47 | 1.65 | 1.65 | 5.61 | 6.35 | 2.77 | 2.70 | 3.56 | 3.38 |
| 50 | 2 | 60.3 | 11.07 | 13.44 | 5.54 | 7.48 | 2.40 | 1.65 | 11.1 | 8.74 | 2.77 | 3.93 | 3.91 | 5.44 |
| 600 | 24 | 609.6 | – | – | 30.96 | 442.08 | 82.47 | 5.54 | 808.22 | 59.54 | 6.35 | 94.45 | 17.48 | 255.41 |
| 65 | 2 1/2 | 73.0 | 14.2 | 20.39 | 7.01 | 11.4 | 3.69 | 2.11 | 14.9 | 9.53 | 3.05 | 5.26 | 5.16 | 8.63 |
| 80 | 3 | 88.9 | 15.24 | 27.65 | 7.62 | 15.2 | 4.51 | 2.11 | 21.3 | 11.1 | 3.05 | 6.45 | 5.49 | 11.30 |
| 300 | 12 | 323.9 | 25.40 | 186.97 | 12.7 | 132.0 | 31.25 | 3.96 | 238.76 | 33.32 | 4.57 | 36.00 | 9.52 | 73.88 |
| 3 | 1/8 | 10.3 | – | – | 2.41 | 0.47 | 0.276 | 1.24 | – | – | 1.24 | 0.28 | 1.73 | 0.37 |
| 100 | 4 | 114.3 | 17.12 | 41.03 | 8.56 | 22.3 | 5.84 | 2.11 | 33.54 | 13.49 | 3.05 | 8.36 | 6.02 | 16.07 |
| 125 | 5 | 141.3 | 19.05 | 57.43 | 9.53 | 31.97 | 9.47 | 2.77 | 49.11 | 15.88 | 3.40 | 11.57 | 6.55 | 21.8 |
| 250 | 10 | 273.1 | 25.40 | 155.15 | 12.7 | 96.0 | 22.63 | 3.40 | 172.4 | 28.6 | 4.19 | 27.78 | 9.27 | 60.5 |
| 200 | 8 | 219.1 | 22.23 | 107.8 | 12.7 | 64.6 | 14.79 | 2.77 | 111.2 | 23.0 | 3.76 | 19.96 | 8.18 | 42.6 |
| 350 | 14 | 355.6 | – | – | 19.05 | 158.08 | 34.36 | 3.96 | 281.70 | 35.71 | 4.78 | 41.3 | 11.13 | 94.59 |
| 6 | 1/4 | 13.7 | – | – | 3.02 | 0.80 | 0.390 | 1.24 | – | – | 1.65 | 0.49 | 2.24 | 0.631 |
| 400 | 16 | 406.4 | – | – | 21.41 | 203.33 | 41.56 | 4.19 | 365.11 | 40.46 | 4.78 | 47.29 | 12.7 | 123.30 |
| 20 | 3/4 | 26.7 | 7.82 | 3.63 | 3.91 | 2.20 | 1.03 | 1.65 | 2.89 | 5.54 | 2.11 | 1.28 | 2.87 | 1.68 |
| 500 | 20 | 508.0 | – | – | 26.19 | 311.2 | 59.25 | 4.78 | 564.68 | 49.99 | 5.54 | 68.71 | 15.09 | 183.42 |
| 450 | 18 | 457.2 | – | – | 23.8 | 254.36 | 46.80 | 4.19 | 466.40 | 45.71 | 4.78 | 53.42 | 14.27 | 155.80 |
SS 304/304L Pipe Price Per Kg in India
SS 304 and 304L pipe prices in India vary based on pipe type, size, finish, and market demand. Rates fluctuate regularly due to changes in nickel content, steel base prices, and production costs. Our seamless pipes generally cost more than welded pipes due to higher production complexity. Pricing also depends on wall thickness, outer diameter, freight, and mill availability. Seamless pipes also attract higher GST and lead time, especially in non-standard lengths.
| Nominal Bore | Outside Diameter | Sch-5S | Rates | Sch-10S | Rates | Sch-40S | Rates | ||||
| mm | INCH | mm | Wt mm | Weight (Kg/mt) | Rs/Kg | Wt mm | Weight (Kg/mt) | Rs/Kg | Wt mm | Weight (Kg/mt) | Rs/Kg |
| 3 | 1/8 | 10.3 | 1.24 | 0.276 | 267.500 | 1.24 | 0.28 | 235.40 | 1.73 | 0.37 | 235.40 |
| 6 | 1/4 | 13.7 | 1.24 | 0.390 | 267.500 | 1.65 | 0.49 | 235.40 | 2.24 | 0.631 | 235.40 |
| 10 | 3/8 | 17.1 | 1.24 | 0.490 | 224.700 | 1.65 | 0.63 | 235.40 | 2.31 | 0.845 | 235.40 |
| 15 | 1/2 | 21.3 | 1.65 | 0.800 | 214.000 | 2.11 | 1.00 | 214.00 | 2.77 | 1.27 | 203.30 |
| 20 | 3/4 | 26.7 | 1.65 | 1.03 | 203.30 | 2.11 | 1.28 | 203.30 | 2.87 | 1.68 | 192.60 |
| 25 | 1 | 33.4 | 1.65 | 1.30 | 203.30 | 2.77 | 2.09 | 197.95 | 3.38 | 2.50 | 197.95 |
| 32 | 1 1/4 | 42.2 | 1.65 | 1.65 | 203.30 | 2.77 | 2.70 | 197.95 | 3.56 | 3.38 | 197.95 |
| 40 | 1 1/2 | 48.3 | 1.65 | 1.91 | 203.30 | 2.77 | 3.11 | 197.95 | 3.68 | 4.05 | 197.95 |
| 50 | 2 | 60.3 | 1.65 | 2.40 | 203.30 | 2.77 | 3.93 | 197.95 | 3.91 | 5.44 | 197.95 |
| 65 | 2 1/2 | 73.0 | 2.11 | 3.69 | 203.30 | 3.05 | 5.26 | 197.95 | 5.16 | 8.63 | 197.95 |
| 80 | 3 | 88.9 | 2.11 | 4.51 | 203.30 | 3.05 | 6.45 | 197.95 | 5.49 | 11.30 | 197.95 |
| 100 | 4 | 114.3 | 2.11 | 5.84 | 203.30 | 3.05 | 8.36 | 197.95 | 6.02 | 16.07 | 197.95 |
| 125 | 5 | 141.3 | 2.77 | 9.47 | 214.00 | 3.40 | 11.57 | 203.30 | 6.55 | 21.8 | 203.30 |
| 150 | 6 | 168.3 | 2.77 | 11.32 | 219.35 | 3.40 | 13.84 | 214.00 | 7.11 | 28.3 | 208.65 |
| 200 | 8 | 219.1 | 2.77 | 14.79 | 219.35 | 3.76 | 19.96 | 214.00 | 8.18 | 42.6 | 208.65 |
| 250 | 10 | 273.1 | 3.40 | 22.63 | 235.40 | 4.19 | 27.78 | 214.00 | 9.27 | 60.5 | 208.65 |
| 300 | 12 | 323.9 | 3.96 | 31.25 | 235.40 | 4.57 | 36.00 | 224.70 | 9.52 | 73.88 | 208.65 |
| 350 | 14 | 355.6 | 3.96 | 34.36 | 235.40 | 4.78 | 41.3 | 230.05 | 11.13 | 94.59 | 208.65 |
| 400 | 16 | 406.4 | 4.19 | 41.56 | 235.40 | 4.78 | 47.29 | 230.05 | 12.7 | 123.30 | 214.00 |
| 450 | 18 | 457.2 | 4.19 | 46.80 | 235.40 | 4.78 | 53.42 | 230.05 | 14.27 | 155.80 | 214.00 |
| 500 | 20 | 508.0 | 4.78 | 59.25 | 235.40 | 5.54 | 68.71 | 230.05 | 15.09 | 183.42 | 214.00 |
| 600 | 24 | 609.6 | 5.54 | 82.47 | 235.40 | 6.35 | 94.45 | 235.40 | 17.48 | 255.41 | 214.00 |
| NB (MM) | SIZE OD (MM) | THICKNESS (MM) | SCHEDULE | UNIT WT (KG/MTR) | PRICE LIST IN INR (Rs/MTR) | ERW PIPE PRICE ($/MTR) | |
| 15 | 21.30 | 2.11 | 1/2″ | SCH.10S | 1.02 | 231.54 | $ 3.32 |
| 21.30 | 2.77 | 1/2″ | SCH.40S | 1.29 | 292.83 | $ 4.20 | |
| 20 | 26.70 | 2.11 | 3/4″ | SCH.10S | 1.30 | 295.10 | $ 4.23 |
| 26.70 | 2.87 | 3/4″ | SCH.40S | 1.71 | 388.17 | $ 5.57 | |
| 25 | 33.40 | 2.77 | 1″ | SCH.10S | 2.12 | 481.24 | $ 6.91 |
| 33.40 | 3.38 | 1″ | SCH.40S | 2.54 | 576.58 | $ 8.27 | |
| 32 | 42.20 | 2.77 | 1.1/4″ | SCH.10S | 2.73 | 619.71 | $ 8.89 |
| 42.20 | 3.56 | 1.1/4″ | SCH.40S | 3.44 | 780.88 | $ 11.21 | |
| 40 | 48.30 | 2.77 | 1.1/2″ | SCH.10S | 3.16 | 717.32 | $ 10.29 |
| 48.30 | 3.68 | 1.1/2″ | SCH.40S | 4.11 | 932.97 | $ 13.39 | |
| 50 | 60.30 | 2.77 | 2″ | SCH.10S | 3.99 | 905.73 | $ 13.00 |
| 60.30 | 3.91 | 2″ | SCH.40S | 5.52 | 1253.04 | $ 17.98 | |
| 65 | 73.00 | 3.05 | 2.1/2″ | SCH.10S | 5.34 | 1212.18 | $ 17.40 |
| 73.00 | 5.16 | 2.1/2″ | SCH.40S | 8.76 | 1988.52 | $ 28.54 | |
| 80 | 88.90 | 3.05 | 3″ | SCH.10S | 6.55 | 1486.85 | $ 21.34 |
| 88.90 | 5.49 | 3″ | SCH.40S | 11.45 | 2599.15 | $ 37.30 | |
| 100 | 114.30 | 3.05 | 4″ | SCH.10S | 8.48 | 1924.96 | $ 27.62 |
| 114.30 | 6.02 | 4″ | SCH.40S | 16.32 | 3704.64 | $ 53.16 | |
| 125 | 141.30 | 3.40 | 5″ | SCH.10S | 11.74 | 2664.98 | $ 38.24 |
| 141.30 | 6.55 | 5″ | SCH.40S | 22.09 | 5014.43 | $ 71.96 | |
| 150 | 168.30 | 3.40 | 6″ | SCH.10S | 14.03 | 3184.81 | $ 45.70 |
| 168.30 | 7.11 | 6″ | SCH.40S | 28.69 | 6512.63 | $ 93.46 | |
| 200 | 219.10 | 3.76 | 8″ | SCH.10S | 20.27 | 4601.29 | $ 66.03 |
| 219.10 | 8.18 | 8″ | SCH.40S | 43.18 | 9801.86 | $ 140.66 | |
Prices above are approximate and subject to change based on raw material costs, pipe form, and market demand.
Resistance Capabilities
SS 304 and SS 304L pipes show strong corrosion resistance in fresh water, air, and most oxidising environments, thanks to their ~18% chromium content which forms a stable passive film. These grades handle dilute acids like nitric acid but offer limited protection in chlorides and hydrochloric acid. With excellent oxidation resistance, both perform well in temperatures up to 870°C intermittently and 925°C continuously, making them suitable for heat exchangers and furnace parts. Their pitting and stress corrosion cracking (SCC) resistance is generally reliable, though care is advised in chloride-heavy conditions. SS 304L, with its low carbon content, helps reduce carbide precipitation during welding, enhancing durability in high-heat zones.
Difference Between 304 and 304L Stainless Steel
Manufacturing Process of 304/304L Stainless Steel Tubes
SS 304/304L tubes begin with raw stainless steel billets, which are heated and then pierced or extruded into hollow forms. For seamless tubes, the process involves hot extrusion followed by cold drawing to achieve precise dimensions. Welded tubes are manufactured by rolling strips of stainless steel into tube form and then welding along the seam. The tubes are shaped, annealed to remove stress, pickled to strip away oxidation, straightened, inspected and tested for mechanical properties, surface finishes and dimensional tolerances. We uses both internal and external testing to make sure that each tube satisfies stringent quality standards.
Round Bar
Analytic
Cut to Length
Centering
Heating
Perforation
Inspection of Size
Pickling
Inspection of Surface
Lubricating
Cold Drawing (Cold Rolling)
Degreasing
Annealing
Straightening
Cut
Pickling / Passivating
Inspection
Analytic
Marking
Packing & Shipping
Applications and Uses of Stainless Steel 304/304L Tubes
SS 304/304L tubes are widely used due to their strength, clean surface and resistance to corrosion. In the food and beverage industry, they provide hygienic piping and fluid transfer. Tubes used in chemicals and pharmaceuticals can withstand corrosive substances. The oil & gas industry uses these tubes in process lines and offshore buildings. Construction industries utilize them for structural frames, whereas marine and water treatment plants use them for their salt and moisture resistance. They are also used in automotive exhausts, heat exchangers, and architectural elements.
Customisation Options & Stock Availability
Midland Alloys offers full customization for SS 304/304L tubes. We provide cut-to-length stainless tubing, non-standard diameters, custom wall thickness, special finishes (polished, pickled, passivated) and specific packaging requirements. Material test reports, traceability documentation, and third-party inspections are some of our value-added services. We ensure timely delivery and stock availability for all orders, regardless of their sizes and schedules.
All ASTM A789 UNS S31803 tubes meet strict international specs for quality and corrosion resistance. We follow ASTM A789 for both seamless and welded tubes. We also supply tubes that meet ASTM A213 and EN standards where required. Each product has complete documentation and traceability, including Material Test Certificates (MTCs) in accordance with EN 10204 3.1 or 3.2. As we are ISO 9001:2015 certified, we conduct various tests. Third-party inspections from TUV, DNV, BV, SGS and Lloyd’s Register are also offered by us. We also support PED 2014/68/EU, NACE MR0175, and AD 2000 W0 requirements on request. From raw material checks to final test reports, our process ensures reliable tubing that meets global standards.
We pack Duplex Steel UNS S31803 tubes to keep them clean, safe, and damage-free during transit. Each tube has plastic-capped ends. We use bubble wrap, anti-rust paper, and seaworthy wrapping to prevent moisture or corrosion. Tubes go into strong wooden crates for added protection. For exports, we offer custom packaging based on client or country needs. Every order is checked, packed, and shipped on time, no matter the destination. Our goal is simple, safe tubes, delivered fast, without hassle.
Why Choose Midland Alloys Inc. for Duplex Steel UNS S31803 Tubes
Midland Alloys Inc., based in Mumbai, India, offers fast manufacturing and global delivery of Duplex Steel UNS S31803 tubes. As a manufacturer of Duplex Steel UNS S31803 tubes with ISO 9001:2015 certification, we adhere to global standards such as ASTM A789 and guarantee 100% traceability with Mill Test Certificates. Our strong quality system, wide stock range, and quick lead times make us a trusted ASTM A789 exporter. We always provide dependable service and consistent quality, whether you need seamless, or welded tubes in standard or customized diameters.
FAQs – Duplex Steel UNS S31803 Tubes
Yes, Midland Alloys supplies Duplex Steel UNS S31803 tubes in coiled and U-bent formats as per customer requirements.
S31803 is equivalent to ASTM A789/A790, UNS S32205, and EN 1.4462 (commonly referred to as Duplex 2205).
