UNS S31803 Flanges Manufacturer in India
Steel Gems supplies high-quality UNS S31803 flanges, engineered to perform reliably in environments where both mechanical strength and corrosion resistance are critical. UNS S31803 is a duplex stainless steel grade known for its balanced microstructure of austenite and ferrite, which delivers a unique combination of durability, toughness, and resistance to aggressive media. This makes it a preferred material for industries that operate under challenging service conditions.
In terms of mechanical properties, these flanges provide higher yield strength, allowing engineers to optimize design by reducing wall thickness without compromising structural integrity. This results in weight reduction and cost efficiency in large-scale piping systems and pressure equipment. The material also maintains good impact strength at moderate temperatures, making it versatile for both onshore and offshore applications.
Leading Suppliers of UNS S31803 Flanges in Mumbai, India, Providing ASTM A182 F51 Material with ANSI / ASME B16.5 Class 150 Standard Flanges with Tested Quality.
Steel Gems offers a complete range of flange types in UNS S31803, including weld neck, slip-on, blind, socket weld, threaded, and lap joint designs. Each type is manufactured to meet specific application requirements, ensuring proper sealing, strength, and ease of installation. Weld neck flanges are preferred for high-pressure systems, while slip-on and threaded options provide flexibility in installation and maintenance.
Industries We Serve - Duplex Steel UNS S31803 Flanges
Our UNS S31803 flanges are widely used in sectors such as oil and gas, petrochemical plants, power generation, desalination units, and marine engineering. They are commonly applied in pipelines, heat exchangers, pressure vessels, and processing equipment where long-term performance and reliability are essential. Their resistance to harsh operating conditions helps reduce maintenance frequency and downtime.
Top Manufacturers of UNS S31803 Flanges in India, Offering ASTM A182 F51 Grade Material with ASME B16.5 Standard Flanges with 100% Quality Assurance and Third-Party Inspection.
Every UNS S31803 flange is supplied in accordance with international standards and undergoes strict inspection for dimensional accuracy, chemical composition, and mechanical performance. This ensures that each product meets the expectations of demanding industrial applications.
Check Latest UNS S31803 Flanges Chemical Composition
| Chemical Composition of UNS S31803 Flanges (%) | |
|---|---|
| Carbon (C) | 0.030 maximum |
| Nickel (Ni) | 4.50 – 6.50 |
| Nitrogen (N) | 0.14 – 0.20 |
| Iron (Fe) | 63.72 minimum |
| Manganese (Mn) | 2.00 maximum |
| Silicon (Si) | 1.00 maximum |
| Phosphorus (P) | 0.030 maximum |
| Sulfur (S) | 0.020 maximum |
| Chromium (Cr) | 22.0 – 23.0 |
| Molybdenum (Mo) | 3.0 – 3.5 |
Duplex Steel UNS S31803 Flanges Specifications
| Specification Of : UNS S31803 Flanges | |
|---|---|
| Forging Technique | Forged, Heat Treated & Machined |
| Flange Forms | Screwed / Forged / Threaded / Plate |
| Common Types | Lap Joint, Threaded, Weld Neck, Blind, Slip-On, Socket Weld |
| Industries | Waterworks & Municipal Systems, Nuclear & Power Plants, Food Processing |
| High Temperature | Above 400°C (750°F) and Above 200°C (400°F) for Class 150 |
| Low Temperature | Above -29°C (-20°F) |
| JIS Standards | 5K to 63K |
| Flange Face Types | RTJ, FF, Raised Face, Lap Joint, Tongue & Groove, Large & Small Male-Female |
| Size Range | 1/2″ to 48″ |
| Available Materials | Carbon Steel, Inconel, Hastelloy, Copper Nickel, Stainless Steel, Cast Iron, Duplex & Super Duplex Steel, Wrought Iron, Alloy Steel, Mild Steel |
| Thickness | NPS ≤ 18 |
| Bore Diameter | NPS ≤ 10 |
| Standards | ANSI/ASME B16.5, B16.47 Series A & B, ASME B16.48, API, API 605, API 7S-15, API 7S-43, EN-1092, BS4504, BS1560-3.1, DIN, UNI, ISO, ISO 7005-1, MSS SP-44, IS 2062, AWWA C207 |
| Pressure Ratings | Class 150 to Class 2500 |
Looking for High-Quality Industrial Metal Products?
Get in touch with our experts for competitive pricing, fast delivery, and customized solutions.
If you are looking for UNS S31803 Flanges suppliers, Steel Gems is ready to help. Contact us today for more details or to get a quick quote.
Steel Gems supplies UNS S31803 flanges across major industrial hubs in India, including Mumbai, Pune, Delhi, Chennai, Ahmedabad, and Hyderabad, while also catering to international markets such as the UAE, Saudi Arabia, Qatar, Oman, Malaysia, Singapore, Indonesia, and South Africa. These duplex steel flanges are valued for their high strength and dependable corrosion resistance, making them suitable for demanding sectors like oil & gas, petrochemical processing, power generation, and offshore operations. With a strong focus on consistent material quality, reliable stock availability, and on-time delivery, Steel Gems continues to support both project-based and ongoing industrial requirements with confidence.
UNS S31803 Flanges Weight Chart
| NPS (Nominal Pipe Size) | SORF (Slip On) | NPT (Threaded) | SWRF (Socket Weld) | Loose (Lap Joint) | BLRF (Blind) | WRNR (Weld Neck) |
|---|---|---|---|---|---|---|
| ½ | 1 | 1 | 2 | 1 | 2 | 2 |
| ¾ | 2 | 2 | 2 | 2 | 2 | 2 |
| 1 | 2 | 2 | 2 | 2 | 2 | 3 |
| 1¼ | 3 | 3 | 3 | 3 | 3 | 3 |
| 1½ | 3 | 3 | 3 | 3 | 4 | 4 |
| 2 | 5 | 5 | 5 | 5 | 5 | 6 |
| 2½ | 8 | 8 | 8 | 8 | 7 | 10 |
| 3 | 9 | 9 | 9 | 9 | 9 | 11.5 |
| 3½ | 11 | 12 | 11 | 11 | 13 | 12 |
| 4 | 13 | 13 | 13 | 13 | 17 | 16.5 |
| 5 | 15 | 15 | 15 | 15 | 20 | 21 |
| 6 | 19 | 19 | 19 | 19 | 27 | 26 |
| 8 | 30 | 30 | 30 | 30 | 47 | 42 |
| 10 | 43 | 43 | 43 | 43 | 70 | 54 |
| 12 | 64 | 64 | 64 | 64 | 123 | 88 |
| 14 | 90 | 90 | 90 | 105 | 140 | 114 |
| 16 | 106 | 98 | 98 | 140 | 180 | 140 |
| 18 | 130 | 130 | 130 | 160 | 220 | 165 |
| 20 | 165 | 165 | 165 | 195 | 285 | 197 |
| 22 | 185 | 185 | 185 | 245 | 355 | 225 |
| 24 | 220 | 220 | 220 | 275 | 430 | 268 |