Home > Duplex Steel > Duplex Steel S31803 Flanges
Bilal Nickel Alloys, based in Safat, Kuwait, is a leading manufacturer and supplier of Duplex Steel S31803 Flanges, delivering premium products recognized for their superior strength, corrosion resistance, and durability. Each flange is manufactured to meet stringent industrial standards, ensuring reliable performance in harsh and demanding environments. Duplex Steel S31803 Flanges are suitable for chemical, petrochemical, oil and gas, marine, and industrial applications, providing long-term structural integrity and operational efficiency. By combining advanced manufacturing processes with skilled craftsmanship, Bilal Nickel Alloys ensures safe, efficient, and durable solutions for industries requiring high-performance alloy components.
Duplex Steel S31803 Flanges are made from a balanced austenitic-ferritic stainless steel alloy containing approximately 22% chromium, 5–6% nickel, 3% molybdenum, and nitrogen as a strengthening element. This composition provides excellent resistance to pitting, crevice, and stress corrosion cracking in aggressive and chloride-rich environments. Mechanically, S31803 exhibits high tensile and yield strength, superior toughness, and excellent fatigue resistance. The alloy also offers good weldability and formability, making it ideal for flanges requiring both long-term mechanical reliability and corrosion resistance in challenging industrial applications.
| 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 Bilal Nickel Alloys, we take pride in being the largest supplier, exporter, and manufacturer of Duplex Steel S31803 Flanges in Safat, Kuwait, providing cutting-edge solutions for all your piping needs. Our state-of-the-art production plants are strategically located in the Kuwait, 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 S31803 Flanges are widely used in industries that require high strength, durability, and corrosion resistance. In oil and gas, they are used for offshore platforms, subsea pipelines, and refinery equipment exposed to aggressive chloride-rich environments. Chemical and petrochemical plants rely on them for handling acids, alkalis, and corrosive chemicals safely. Marine and desalination industries benefit from their resistance to seawater and harsh operational conditions. Additionally, S31803 Flanges are employed in power generation, pulp and paper, and other high-performance industrial systems, ensuring long-lasting, reliable performance in demanding operational environments.
