UNS S31803 Pipes have been manufactured with a view to addressing the challenges faced by industrial systems where a combination of very high strength and high corrosion resistance is needed. The pipes feature a duplex structure consisting of 50% ferrite and 50% austenite and possess nearly twice the yield strength of the conventional 304 and 316 stainless steel, as well as excellent resistance to pitting, crevice and chloride stress corrosion cracking. These can be employed in the most unfriendly and harsh environments wherein industries such as chemicals, offshore, marine, oil & gas, and desalination function. These alloys have compositions of 22% chromium, 4.5-6.5% nickel, and 3.0-3.5% molybdenum. They can be found as seamless, welded, and fabricated in different diameters and schedules. With 12 years of experience as a trusted UNS S31803 Pipes Manufacturer and Supplier, USA piping solution offers precision-engineered pipes that are produced to international standards with consistent performance, dimensions and durability.
Specifications of UNS S31803 Pipes
| Specification Parameter | Technical Details |
|---|---|
| Standard Specifications | ASTM A790 / ASME SA790 |
| Dimensional Standard | ANSI/ASME B36.19M, ANSI/ASME B36.10M |
| Seamless Pipe Size Range | 1/2" NB - 16" NB |
| Welded Pipe Size Range | 1/2" NB - 24" NB |
| EFW Pipe Size Range | 6" NB - 24" NB |
| Outside Diameter (OD) | 6.00 mm OD up to 914.4 mm OD (Sizes up to 24" NB available ex-stock) |
| Manufacturing Techniques | Seamless, Welded, ERW, Fabricated, CDW, 100% X-Ray Welded |
| Manufacturing Shapes | Hydraulic, Round, Rectangle, Square, Hex, Honed |
| Schedule / Thickness Range | SCH 5, SCH 10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS |
| End Configurations | Plain End, Beveled End, Threaded One End, TBE (Threaded Both Ends) |
| Delivery Condition | Annealed & Pickled, Polished, Bright Annealed, Cold Drawn |
| Surface / Outside Finish | No.1, 2B, No.4, No.8 Mirror Finish (or as per customer requirements) |
| Value Added Services | Cutting, Beveling, Polishing, Threading, Destructive & Non-Destructive Testing, Ultrasonic Testing |
| Inspection & Test Reports | EN 10204 3.1, Mill Test Certificates, Chemical & Mechanical Reports, PMI Testing, Third-Party Inspection, NABL Approved Lab Reports, Visual Inspection |
| Standard Pipe Marking | Specification, Grade, Nominal Pipe Size, Schedule/WT, Method (Seamless/Welded), Heat Number, Manufacturer Name/Logo |
| Marking Sample | ANSI B36.19 ASTM A 790 S31803 12" NB SCH 40S SEAMLESS HEAT NO. XXXX |
| Packing Methods | Wooden Boxes, Plastic Bags, Steel Strips Bundled, or per customer request |
| Special Requests | Custom sizes and non-standard specifications available upon request |
Applications and Industrial Uses of UNS S31803 Pipes
- Offshore Oil & Gas Production Platforms
- Seawater Desalination Plants
- Fertilizer Manufacturing Industry
- Chlor-Alkali Chemical Plants
- LNG (Liquefied Natural Gas) Processing Plants
- Pulp & Paper Bleaching Mills
- Offshore Wind Energy Industry
- Marine Shipbuilding & Naval Engineering
Frequently Asked Questions
What is the difference between UNS S31803 and UNS S32205?
UNS S32205 is an improved version of UNS S31803 with a tighter chemical composition for better corrosion resistance. In many applications, UNS S32205 is supplied as a replacement for UNS S31803.
What is the equivalent grade/Werkstoff number for UNS S31803?
The equivalent Werkstoff number for UNS S31803 is 1.4462, which is widely used under European standards.
What is the PREN (Pitting Resistance Equivalent Number) of UNS S31803?
UNS S31803 typically has a PREN value of 35 or higher, indicating excellent resistance to pitting corrosion in chloride-containing environments.
What is the difference between seamless and welded UNS S31803 pipe, and which is stronger?
Seamless pipes are manufactured from a solid billet without a weld and are stronger for high-pressure applications. Welded pipes are made by joining steel strips and are more cost-effective for general industrial use.
What is the maximum service temperature for UNS S31803 before embrittlement risk increases?
UNS S31803 is generally recommended for continuous service up to 300 °C (572 °F). Above this temperature, the risk of embrittlement and reduced toughness increases.