Duplex Steel UNS S31803 Pipes and Tube Manufacturer in India
Duplex Steel UNS S31803 Pipes and Tube Manufacturer in India
Sachiya Steel International is a trusted Duplex Steel UNS S31803 Pipes and Tubes Manufacturer in India, supplying high-quality duplex stainless steel products for demanding industrial applications. With over 20 years of experience since 2005, we serve customers in 85+ countries and supply pipes and tubes for oil and gas, chemical processing, marine, petrochemical and power generation industries. Our ISO 9001:2015, ISO 14001:2015 and TÜV certifications reflect our commitment to quality and reliable product supply.
Our Duplex Steel UNS S31803 Pipes and Tubes offer a combination of high strength, excellent corrosion resistance and good resistance to stress corrosion cracking. We supply products in different sizes, wall thicknesses, schedules and lengths to meet specific project requirements. Our range supports applications that require durable materials to withstand harsh environments, chloride exposure and demanding operating conditions. We can also provide material test certificates and inspection documentation as per agreed order requirements.
What Are Duplex Steel UNS S31803 Pipes and Tube?
Duplex Steel UNS S31803 Pipes and Tube are stainless steel products made from a 22% chromium, 5% nickel, 3% molybdenum alloy with added nitrogen. Its structure is roughly half austenite and half ferrite, which is why it is called duplex.
The ferrite phase adds strength and resistance to stress corrosion cracking. The austenite phase adds toughness and weldability. Nitrogen strengthens both and improves pitting resistance. Pipe is the product sold by nominal size and schedule. Tube is sold by exact outside diameter and wall, and is used for heat exchangers, condensers and instrument lines.
Duplex Steel UNS S31803 Pipes and Tube
Corrosion-resistant UNS S31803 duplex steel pipes and tubes developed for demanding applications across offshore,chemical processing, oil & gas and marine industries. Available in multiple diameters, wall thicknesses,and specifications to suit diverse project requirements.
Types of Duplex Steel UNS S31803 Pipes and Tubes
As an experienced Duplex Steel UNS S31803 Pipes and Tubes Manufacturer, we offer different types of pipes and tubes to meet the needs of various industries. These products are available in different sizes, wall thicknesses, finishes and specifications for applications that require high strength and excellent corrosion resistance.
- Seamless Duplex Steel UNS S31803 Pipes: Manufactured without a welded seam, these pipes are suitable for high-pressure applications in oil and gas plants, refineries and chemical industries.
- Welded Duplex Steel UNS S31803 Pipes: Made by welding steel strips or plates, these pipes offer a reliable solution for industrial piping systems.
- Duplex Steel UNS S31803 Tubes: Used in heat exchangers, process equipment and fluid transfer systems that require strength and corrosion resistance.
- Cold-Drawn Duplex Steel UNS S31803 Tubes: Offer better dimensional accuracy and a smooth surface finish for applications with precise size requirements.
- Hot-Finished Duplex Steel UNS S31803 Pipes: Suitable for industrial piping systems that require specific dimensions and dependable mechanical properties.
- Heavy-Wall Duplex Steel UNS S31803 Pipes: Designed for applications that require greater wall thickness to meet project and engineering specifications.
- Polished Duplex Steel UNS S31803 Tubes: Feature a smooth surface finish for applications with specific surface quality requirements.
- Custom-Sized Duplex Steel UNS S31803 Pipes and Tubes: Available in different diameters, wall thicknesses and lengths to match customer drawings and project specifications.
We supply products to meet the requirements of oil and gas, petrochemical, marine, chemical processing and power generation industries. Contact us to discuss your required sizes, specifications and quantities.
Why Choose Duplex Steel UNS S31803 Pipes and Tubes?
Duplex steel combines the properties of austenitic and ferritic stainless steel to deliver high strength and excellent corrosion resistance. UNS S31803 is a suitable choice for industrial applications that involve moisture, chlorides, chemicals and demanding operating conditions. Its balanced properties help improve equipment reliability and support long-term performance when the material is selected, installed and maintained correctly.
- High Strength: Offers greater strength than many conventional austenitic stainless steel grades, helping meet demanding design requirements.
- Excellent Corrosion Resistance: Resists corrosion in many industrial environments, including those exposed to chlorides.
- Resistance to Stress Corrosion Cracking: Performs well in environments where chloride-related stress corrosion cracking can affect other stainless steel grades.
- Good Pitting and Crevice Corrosion Resistance: Helps protect equipment from localized corrosion in suitable service conditions.
- Good Weldability: Supports fabrication and installation when suitable welding procedures and controls are followed.
- Long Service Life: Provides reliable performance under appropriate operating conditions, helping reduce maintenance needs.
- High Pressure Performance: Its strength supports demanding piping applications when dimensions and wall thickness meet design requirements.
- Wide Industrial Use: Suitable for oil and gas, chemical processing, petrochemical, marine and offshore applications.
These properties make this grade a practical option for projects that require a balance of mechanical strength and corrosion resistance. Selecting the right dimensions, applicable standards and material certification helps ensure the product meets your specific operating and safety requirements.
Types of Pipes & Tubes
Explore our range of industrial pipes and tubes, manufactured for different applications, materials, specifications and engineering requirements.
Pipes and Tubes
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Seamless Pipes
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ERW Pipes
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LSAW Pipes
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SSAW Pipes
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Seamless Tubes
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Welded Pipes
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Welded Tubes
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Box Pipes
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Box Tubes
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Brass Pipes
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Heat Exchanger Tubes
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Boiler Tubes
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Aluminium Pipes
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Carbon Steel Seamless Pipes
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Carbon Steel Pipe
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Stainless Steel Pipe
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Alloy Steel Pipe
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Duplex Steel Pipe
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Super Duplex Steel Pipe
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Nickel Alloy Pipe
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Copper Nickel Alloy Pipe
→Get Certified Duplex Steel UNS S31803 Pipes and Tube at Competitive Factory Prices
Duplex Steel UNS S31803 Pipes and Tube Specifications
| Property | Detail |
|---|---|
| Grade | Duplex UNS S31803 (2205) |
| Also Available | UNS S32205, dual certified when the heat meets both |
| EN / Werkstoff | 1.4462 (X2CrNiMoN22-5-3) |
| Pipe Standard | ASTM A790 / ASME SA790 |
| Tube Standard | ASTM A789 / ASME SA789 |
| Pipe Types | Seamless, welded, EFW |
| Tube Types | Seamless, welded |
| Pipe Size | ⅛" to 24" NB; custom sizes on request |
| Tube Size | By OD and wall, as per your order |
| Schedules | 5S, 10S, 40S, 80S, 160, XXS |
| Length | Single random, double random, cut length |
| Ends | Plain, beveled, threaded |
| Condition | Solution annealed and quenched |
| Finish | Annealed and pickled, or bright annealed |
| Testing | PMI, hydrostatic, ET or UT, flattening, ferrite check |
| Certificate | EN 10204 3.1; 3.2 on request |
Duplex Steel UNS S31803 Pipes and Tube Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 2.00 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.030 max |
| Sulfur (S) | 0.020 max |
| Chromium (Cr) | 21.00 – 23.00 |
| Nickel (Ni) | 4.50 – 6.50 |
| Molybdenum (Mo) | 2.50 – 3.50 |
| Nitrogen (N) | 0.08 – 0.20 |
| Iron (Fe) | Balance |
Limits per ASTM A790 and A789 for UNS S31803.
Duplex Steel UNS S31803 Pipes and Tube Mechanical Properties
| Property | Requirement |
|---|---|
| Tensile Strength | 620 MPa (90 ksi) min |
| Yield Strength (0.2% offset) | 450 MPa (65 ksi) min |
| Elongation | 25% min |
| Hardness | 290 HBW / 30.5 HRC max |
| Density | approx. 7.80 g/cm³ |
| Melting Range | approx. 1420 – 1465 °C |
| Thermal Expansion (20–100 °C) | approx. 13.0 µm/m·°C |
Yield strength is the big advantage over 316L, which is about 170 MPa. That lets designers specify thinner walls for the same pressure, which cuts weight and cost.
Duplex Steel UNS S31803 vs S32205 Pipes and Tube
Buyers see both numbers on enquiries, and the difference is narrow. S32205 was added later with a slightly tighter chemistry window for better corrosion performance, especially higher chromium, molybdenum and nitrogen minimums.
| Point | UNS S31803 | UNS S32205 |
|---|---|---|
| Chromium | 21.0 – 23.0% | 22.0 – 23.0% |
| Molybdenum | 2.5 – 3.5% | 3.0 – 3.5% |
| Nitrogen | 0.08 – 0.20% | 0.14 – 0.20% |
| Nickel | 4.5 – 6.5% | 4.5 – 6.5% |
| Tensile Strength (min) | 620 MPa | 655 MPa |
| Yield Strength (min) | 450 MPa | 450 MPa |
| Typical PREN | About 34 – 36 | About 35 – 36 |
Most 2205 produced today is melted inside the S32205 range, which also falls inside the S31803 range, so it can be dual certified to both. If your specification names S31803 only, you can still receive S32205 pipe that meets it. If it names S32205, S31803 pipe that only meets the wider range is not acceptable. Tell us which number your drawing uses, and we will supply the right certificate.
Corrosion Resistance and Temperature Limits of Duplex Steel UNS S31803 Pipes and Tube
In chloride service, 2205 resists pitting and crevice corrosion far better than 316L. The critical pitting temperature in standard G48 testing is typically around 35 °C, compared with under 15 °C for 316L. Its ferrite content makes it highly resistant to chloride stress corrosion cracking, which regularly kills 304 and 316 in hot, wet chloride lines.
Temperature sets the boundaries. Design codes generally limit 2205 to around 300 °C, because long exposure between roughly 300 and 525 °C can cause embrittlement, and between roughly 600 and 950 °C intermetallic phases such as sigma form. Low-temperature toughness is good, down to about −50 °C.
Fabrication matters too. Heat input must be controlled during welding to keep the austenite-ferrite balance intact, and the pipe must be solution annealed and quenched correctly at the mill. Pickling and passivation restore the surface after fabrication.
Duplex Steel UNS S31803 Pipes and Tubes Standards
| Standard | Description |
|---|---|
| ASTM A790 / ASME SA790 | Covers seamless and welded ferritic-austenitic stainless steel pipes. |
| ASTM A789 / ASME SA789 | Covers seamless and welded ferritic-austenitic stainless steel tubes. |
| ASTM A928 | Covers ferritic-austenitic stainless steel pipes with fusion-welded seams and filler metal. |
| ASTM A999 | Specifies general requirements for alloy and stainless steel pipes. |
| ASTM A1016 | Specifies general requirements for ferritic alloy, austenitic alloy and stainless steel tubes. |
| ASME B36.19M | Covers dimensions and wall thicknesses for stainless steel pipes. |
| EN 10216-5 | Covers seamless stainless steel tubes for pressure purposes. |
| EN 10217-7 | Covers welded stainless steel tubes for pressure purposes. |
| ASTM A923 | Provides test methods to detect harmful intermetallic phases in duplex stainless steels. |
| ASTM G48 | Covers tests for resistance to pitting and crevice corrosion. |
| NACE MR0175 / ISO 15156 | Specifies material requirements for use in H₂S-containing environments in oil and gas production. |
| NORSOK | Provides material requirements for applicable offshore and petroleum industry projects. |
Additional inspections may include positive material identification (PMI), ferrite content checks, hydrostatic testing, non-destructive testing and flattening tests, depending on the applicable standard and purchase order. Third-party inspection can also be arranged when agreed upon.
Duplex Steel UNS S31803 Pipes and Tubes Material and Grades
| Property | Description |
|---|---|
| Material Grade | Duplex Stainless Steel UNS S31803 |
| Common Name | Duplex 2205 |
| Material Family | Ferritic-Austenitic Stainless Steel |
| UNS Number | S31803 |
| EN / DIN Number | 1.4462 |
| European Grade | X2CrNiMoN22-5-3 |
| Chromium (Cr) | Approximately 21–23% |
| Nickel (Ni) | Approximately 4.5–6.5% |
| Molybdenum (Mo) | Approximately 2.5–3.5% |
| Nitrogen (N) | Approximately 0.08–0.20% |
| PREN | Typically around 35 or higher, depending on composition |
| Microstructure | Austenite-Ferrite |
| Heat Treatment | Solution annealing, followed by rapid cooling as specified |
| Temperature Limitation | Often used below approximately 300°C; suitability depends on service conditions and design requirements |
| Common Applications | Oil and gas, chemical processing, marine, offshore and petrochemical industries |
UNS S31803 offers higher strength and better resistance to chloride stress corrosion cracking than many conventional austenitic stainless steel grades, such as 316L. However, its suitability depends on temperature, chloride concentration, operating pressure and other service conditions. For highly aggressive environments, super duplex grades such as UNS S32750 or S32760 may be more appropriate.
Duplex Steel UNS S31803 Pipes and Tube Manufacturers and Suppliers in India
Plenty of firms list "S31803 / S32205" in one breath. The real question is whether the pipe in front of you was annealed, quenched and tested properly, because duplex is sensitive to heat treatment. As a Duplex Steel UNS S31803 Pipes Manufacturer, we make the pipe, so we can show where each length came from.
We work the same way as a Duplex Steel UNS S31803 Tube Manufacturer, with tube cut and tested to your order. Buyers searching for a Duplex Steel UNS S31803 Pipes and Tube Supplier in India often need matching A182 F51 flanges, A815 fittings and 2205 plate too. We can quote the full package so grade and heat numbers line up across the job.
Duplex Steel UNS S31803 Pipes and Tube Size and Weight Chart
Weight per metre = (OD − wall) × wall × 0.0245, with OD and wall in mm. This uses a density of 7.80 g/cm³. Treat the numbers as estimates, since the real weight moves with the wall tolerance.
OD and wall are in mm. Multiply the result by the pipe or tube length to obtain the total weight.
Pipes
| NPS | OD (mm) | Sch 10S | Sch 40S | Sch 80S |
|---|---|---|---|---|
| 1" | 33.4 | 2.08 kg/m (2.77 mm) | 2.49 kg/m (3.38 mm) | 3.22 kg/m (4.55 mm) |
| 2" | 60.3 | 3.90 kg/m (2.77 mm) | 5.40 kg/m (3.91 mm) | 7.43 kg/m (5.54 mm) |
| 4" | 114.3 | 8.31 kg/m (3.05 mm) | 15.97 kg/m (6.02 mm) | 22.18 kg/m (8.56 mm) |
| 6" | 168.3 | 13.74 kg/m (3.40 mm) | 28.08 kg/m (7.11 mm) | 42.28 kg/m (10.97 mm) |
| 8" | 219.1 | 19.84 kg/m (3.76 mm) | 42.27 kg/m (8.18 mm) | 64.22 kg/m (12.70 mm) |
| 12" | 323.9 | 35.75 kg/m (4.57 mm) | 79.21 kg/m (10.31 mm) | 96.83 kg/m (12.70 mm) |
Tubes
| OD (mm) | Wall (mm) | Weight (kg/m) |
|---|---|---|
| 12.7 | 1.24 | 0.35 |
| 19.05 | 1.65 | 0.70 |
| 25.4 | 1.65 | 0.96 |
| 25.4 | 2.11 | 1.20 |
| 38.1 | 2.11 | 1.86 |
| 50.8 | 2.77 | 3.26 |
For any other size, wall or schedule, we can share a complete weight chart on request.
Duplex Steel UNS S31803 Pipes and Tube Sizes, Dimensions and Schedules
Pipe runs from ⅛" up to 24" NB, from light Sch 5S and 10S to Sch 160 and XXS. Because duplex is strong, many designs can use a lighter schedule than they would in 316L, so check the wall against your code before you order. Tube is made to the OD and wall you specify, in the usual range for heat exchangers and instrument lines.
Pipes and tubes come in single random, double random or cut lengths. Ends can be plain, beveled for welding or threaded. For surface, annealed and pickled is standard, and bright annealed tube is available for cleaner duty. All product is supplied solution annealed and quenched, which restores the balanced structure that gives duplex its properties.
Duplex Steel UNS S31803 Pipes and Tubes Common Materials
Duplex Steel UNS S31803 Pipes and Tubes are available under different material designations used in industrial drawings, purchase orders and engineering specifications. These references help buyers identify the correct grade for piping systems, fittings, flanges and other components. We support customers looking for reliable Duplex Steel UNS S31803 Pipes and Tubes Suppliers by providing products according to specified grades and applicable standards.
Common Name: Duplex 2205, 22Cr Duplex
UNS Grades: S31803, S32205
EN / DIN Grades: 1.4462, X2CrNiMoN22-5-3
JIS Grade: SUS329J3L
AFNOR Grade: Z3CND22-05-03
Forged Flange Equivalent: ASTM A182 F51
Pipe Fitting Equivalent: ASTM A815 WP-S31803
Plate Equivalent: ASTM A240 S31803
Bar Equivalent: ASTM A276 S31803
These designations help simplify material selection and product sourcing for industrial projects. However, S31803 and S32205 have different chemical composition limits, so buyers should confirm the required grade against the applicable standard and purchase order. Material test certificates and inspection documents can also help verify that the supplied products meet project specifications.
Duplex Steel UNS S31803 Pipes and Tube Applications
- Oil and Gas: Produced water, flowlines and topside process piping where chlorides and CO₂ are present.
- Desalination Plants: High-pressure reverse osmosis piping and brine lines.
- Chemical Processing: Reactors, heat exchangers and lines handling chloride-bearing and acidic streams.
- Offshore and Marine: Seawater cooling, firewater and ballast systems.
- Heat Exchangers and Condensers: Tube bundles where 316L fails by stress corrosion cracking.
- Pulp and Paper: Digesters, bleach plants and liquor lines.
- Power Generation: Flue gas desulfurization systems and cooling water circuits.
- Fertilizer and Construction: Process lines and structural tube where strength and corrosion resistance both count.
Why Choose Us as Your Duplex Steel UNS S31803 Pipes and Tubes Manufacturer in India?
With over 20 years of experience since 2005, we manufacture and supply Duplex Steel UNS S31803 Pipes and Tubes for oil and gas, chemical processing, marine, petrochemical and other industrial applications. We serve customers in 85+ countries and offer products in different sizes, wall thicknesses, schedules and lengths to meet project requirements. Our ISO 9001:2015, ISO 14001:2015 and TÜV certifications, along with MSME registration, reflect our commitment to quality and reliable supply.
We focus on providing products that meet applicable industry standards and customer specifications. We can supply material test certificates, inspection reports and third-party inspection services as agreed for each order. Our team also supports customers with product selection, technical requirements, export documentation and shipping arrangements. Contact us with your required grade, dimensions, quantity and delivery details to request a quotation for your project.
Countries We Export Duplex Steel UNS S31803 Pipes and Tubes To
We supply Duplex Steel UNS S31803 Pipes and Tubes to customers in 85+ countries, serving industries such as oil and gas, chemical processing, marine, petrochemical and power generation. We support international orders with product documentation, material test certificates, suitable packaging and shipping arrangements based on customer requirements. Our export services help distributors, contractors, manufacturers and EPC companies source products for projects across different markets.
North America: USA, Canada, Mexico
Europe: Germany, United Kingdom, France, Italy, Netherlands, Spain, Poland
Middle East: UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain
Asia-Pacific: Singapore, Malaysia, Indonesia, Australia, Japan, South Korea, Vietnam
Africa: South Africa, Nigeria, Egypt, Kenya, Morocco
South America: Brazil, Argentina, Chile, Peru
We can arrange export packaging, pipe-end protection and relevant shipping documents, including commercial invoices, packing lists and material test certificates, according to order requirements. Third-party inspection and additional certification can also be coordinated when agreed upon. Contact us with your destination country, required dimensions and quantity to discuss availability and shipping options.