Duplex Steel UNS S31803 Flanges are high-performance piping components designed for demanding industrial, mechanical, and structural engineering applications. Steel Icon Stainless Pvt. Ltd. manufactures precision-engineered duplex steel flanges that deliver exceptional strength and corrosion resistance in aggressive environments. These flanges are widely used in oil and gas processing, offshore platforms, petrochemical plants, power generation facilities, and marine systems where reliability and safety are critical.
Engineered for secure pipe connections in high-pressure and high-temperature systems, Duplex Steel UNS S31803 Flanges provide superior mechanical stability compared to conventional austenitic stainless steel flanges. Their balanced microstructure ensures enhanced performance in environments exposed to chlorides, acids, and fluctuating loads.
Duplex Steel UNS S31803 is a nitrogen-enhanced duplex stainless steel that combines both austenitic and ferritic microstructures in approximately equal proportions. The chemical composition typically includes around 22 percent chromium, 5 to 6 percent nickel, 3 percent molybdenum, and controlled nitrogen content. This composition enhances strength while significantly improving resistance to pitting, crevice corrosion, and stress corrosion cracking.
The dual-phase microstructure provides higher yield strength than standard stainless steel grades such as 304 and 316. Duplex Steel UNS S31803 Flanges exhibit excellent tensile properties, good impact strength, and reliable fatigue resistance. The presence of molybdenum and nitrogen increases resistance to localized corrosion, particularly in chloride-rich environments common in marine and offshore installations.
These flanges maintain structural integrity under high pressure and moderate elevated temperatures. Their superior mechanical performance allows designers to use thinner sections without compromising safety, reducing overall system weight and material costs. Duplex steel flanges are available in various types including weld neck, slip-on, blind, socket weld, and threaded flanges to meet diverse piping requirements.
Duplex Steel UNS S31803 Flanges, Duplex Steel UNS S31803 Flanges Manufacturers, Duplex Steel UNS S31803 Flanges Suppliers, Duplex Steel UNS S31803 Flanges Stockists, Duplex Steel UNS S31803 Flanges Exporters
Duplex Steel UNS S31803 Flanges offer a unique combination of high strength and outstanding corrosion resistance. Their higher yield strength allows for lighter and more compact piping systems, which translates into cost savings in large industrial projects. The material resists chloride-induced stress corrosion cracking, making it suitable for seawater handling systems and desalination plants.
Durability is a key benefit of duplex steel flanges. They withstand harsh chemical exposure in refineries, fertilizer plants, and chemical processing facilities. The enhanced resistance to pitting and crevice corrosion reduces the risk of leakage and extends service life in pressure equipment and industrial piping systems.
In terms of fabrication, Duplex Steel UNS S31803 Flanges provide good weldability when proper procedures are followed. Their machinability is suitable for precise flange dimensions and sealing surfaces, ensuring leak-proof connections. The long-term performance and reduced maintenance requirements make them a cost-effective choice for critical industrial infrastructure.
Duplex Steel UNS S31803 Flanges in India, Duplex Steel UNS S31803 Flanges Manufacturers in India, Duplex Steel UNS S31803 Flanges Suppliers in India, Duplex Steel UNS S31803 Flanges Stockists in India, Duplex Steel UNS S31803 Flanges Exporters in India
In offshore oil and gas operations, Duplex Steel UNS S31803 Flanges Manufacturers supply flanges used in subsea pipelines, risers, and processing modules exposed to seawater and high pressure. The material’s resistance to chloride corrosion ensures reliable performance in extreme marine environments.
Within petrochemical and chemical processing industries, Duplex Steel UNS S31803 Flanges Suppliers provide components for reactors, heat exchangers, and high-pressure piping systems that handle aggressive chemicals. The duplex structure offers enhanced resistance to stress corrosion cracking and extends equipment lifespan.
For industrial maintenance and plant construction, Duplex Steel UNS S31803 Flanges Stockists maintain ready inventory of standard and customized flange types to support fast-track projects and shutdown requirements. Immediate availability of pressure-rated flanges reduces downtime in power plants and refineries.
In international infrastructure and marine engineering projects, Duplex Steel UNS S31803 Flanges Exporters deliver certified flanges for use in desalination plants, shipbuilding, and coastal processing facilities. Compliance with global standards and strict quality control ensures consistent performance across global markets.
Duplex Steel UNS S31803 Flanges in United States, Duplex Steel UNS S31803 Flanges Manufacturers in United States, Duplex Steel UNS S31803 Flanges Suppliers in United States, Duplex Steel UNS S31803 Flanges Stockists in United States, Duplex Steel UNS S31803 Flanges Exporters in United States
Duplex Steel UNS S31803 Flanges are manufactured in compliance with ASTM A182 specification for forged or rolled alloy and stainless steel pipe flanges and fittings. The corresponding ASME standard is ASME SA182, which governs flanges intended for high-temperature and pressure services. These standards define chemical composition, mechanical properties, heat treatment, and testing requirements to ensure suitability for critical piping systems. Pressure ratings are generally aligned with ASME B16.5 and ASME B16.47 dimensional standards, ensuring compatibility with industrial piping networks in oil and gas, power generation, and chemical processing sectors.
Steel products such as flanges, round bars, pipes, tubes, plates, sheets, and coils are identified and classified according to internationally recognized standards including ASTM, ASME, EN, DIN, JIS, and ISO. ASTM and ASME specifications are widely used for pressure equipment and industrial piping systems across North America and the Middle East. EN and DIN standards regulate material grades and dimensions within European markets, while JIS governs Japanese industrial specifications. ISO standards ensure harmonized testing procedures and quality management practices. Duplex Steel UNS S31803 is also referred to under EN designation 1.4462, allowing engineers and procurement teams to specify equivalent grades confidently for structural engineering, industrial fabrication, and high-performance process equipment.
Steel Icon Stainless Pvt. Ltd. is one of the leading manufacturers & suppliers of Duplex S31803 Stainless Steel Weld Neck Flanges Manufacturer, ASME 16.5 Duplex Steel UNS S31803 Slip On Raised Face (SORF) Flanges, Duplex UNS S31803 Ring Type Joint Flanges (RTJ) Wholesaler, Class 300# Duplex Steel UNS S31803 Lap Joint Flanges, UNS S31803 Ferritic/Austenitic Stainless Steel Socket weld Flanges at the best price in India
Request Latest Price & Stock Availability| Specifications | ASTM A182 / ASME SA182 |
|---|---|
| Dimensions | ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc. |
| Standard | ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc. |
| Size | 1/8″ NB TO 24″ NB |
| Class | / Pressure 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc. |
| Flange Face Type | Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
| Grade | S31803 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61 |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| S31803 | 0.030 max | 2.00 max | 1.00 max | 0.030 max | 0.020 max | 22.0 – 23.0 | 3.0 – 3.5 | 4.50 – 6.50 | 0.14 – 0.20 | 63.72 min |
| Grade | Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
|---|---|---|---|---|---|
| S31803 | 7.8 g/cm3 | 1350 °C (2460 °F) | Psi – 116000 , MPa – 800 | Psi – 80000 , MPa – 550 | 15 % |
