Home > Duplex Steel > Duplex Steel S31803 Flanges
At Nasir Nickel Alloys in Manama, Bahrain, Duplex Steel Flanges S31803 are engineered to provide exceptional corrosion resistance, high mechanical strength, and long-term reliability for demanding chemical, petrochemical, marine, and industrial applications. Manufactured from duplex stainless steel with a balanced microstructure of austenite and ferrite, these flanges deliver superior resistance to pitting, crevice corrosion, and stress corrosion cracking while maintaining excellent structural integrity. Precision-engineered for leak-proof connections and consistent performance, Duplex Steel Flanges S31803 are ideal for chemical processing units, offshore platforms, marine systems, and high-pressure pipelines, offering durable and reliable solutions in aggressive environments.
Duplex Steel Flanges S31803 are primarily composed of iron, chromium, nickel, and molybdenum, with nitrogen additions to enhance corrosion resistance and mechanical strength. This composition ensures excellent resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride-rich and aggressive chemical environments. Mechanically, these flanges provide high tensile and yield strength, excellent toughness, and fatigue resistance under fluctuating pressures and thermal cycling. With dimensional stability and structural integrity in harsh chemical, marine, and high-pressure conditions, Duplex Steel Flanges S31803 combine superior corrosion resistance with robust mechanical performance for reliable long-term operation.
| Specifications | ASTM A182 / ASME SA182 |
| Size | 1/8″ NB TO 48″ NB |
| Standards | ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc. |
| Class / Pressure | 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc. |
| Standard | ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc. |
| Grades | S31803 / S32205 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 |
| Grades | Density (g/cm 3) | Density (lb/in 3) | Melting Point (°C) | Melting Point (°F) |
| S31803 | 7.805 | 0.285 | 1420 – 1465 | 2588 – 2669 |
At Nasir Nickel Alloys, we take pride in being the largest supplier, exporter, and manufacturer of Duplex Steel S31803 Flanges in Manama, Bahrain, providing cutting-edge solutions for all your piping needs. Our state-of-the-art production plants are strategically located in the Bahrain, allowing us to maintain a vast inventory of over 16,000 tons of premium-quality materials readily available in stock. We are dedicated to delivering superior products and services, ensuring reliability and excellence for our global clientele.
Contact us to get a quick quote for your requirement.
Duplex Steel Flanges S31803 are widely used in industries requiring high corrosion resistance, mechanical strength, and durability. They are ideal for chemical processing equipment, petrochemical plants, heat exchangers, offshore platforms, marine systems, and high-pressure industrial pipelines. Their resistance to pitting, crevice corrosion, and stress corrosion cracking makes them suitable for aggressive chemical, chloride-rich, and marine environments. These flanges provide secure, leak-proof connections in piping and process systems, ensuring safe and efficient operation. By delivering long-term performance under demanding conditions, Duplex Steel Flanges S31803 ensure durable, efficient, and reliable operation across chemical, petrochemical, marine, and industrial applications.
