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UNS S31803 Duplex Steel Buttweld Pipe Fittings combine strength, durability, and corrosion resistance for industrial applications. These fittings are suitable for chemical, petrochemical, marine, and offshore operations. Available in elbows, tees, reducers, crosses, and pipe caps, the fittings are fabricated in seamless and welded forms. Custom sizes and specifications are provided for complex pipeline designs. The alloy composition ensures excellent resistance to chloride stress corrosion and high-temperature corrosion. ASTM A815 and ASME SA815 compliance guarantees high quality. These Duplex Steel fittings provide a reliable solution for critical fluid handling, offshore pipelines, and industrial process systems.
Duplex Steel UNS S31803 Buttweld Fittings are ideal for industries requiring high strength and corrosion-resistant piping solutions. These fittings are available in seamless, welded, and fabricated forms, including elbows, tees, reducers, crosses, and end caps. They perform exceptionally in seawater, chemical, and petrochemical systems, preventing pitting, crevice corrosion, and stress corrosion cracking. Fabrication meets ASTM A815 and ASME SA815 standards for quality assurance. Custom dimensions and configurations are offered for industrial and offshore pipelines. These duplex steel fittings ensure durability, safety, and long-term performance in high-pressure and high-temperature environments.
ASTM A815 S31803 Industrial Buttweld Pipe Specification
Grades : Duplex Steel – UNS NO. S31803
Standards: ASTM / ASME / ANSI Flanges, DIN Flanges, EN Flanges, BS Flanges etc.
Specifications: ASTM / ASME A 815
Dimension: ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA, Custom Drawings
Size: 1/2″ NB – 60″NB
Class& LBS: 150#, 300#, 600#, 900#, 1500#, 2500#, DIN ND PN6, PN10, PN16, PN25,PN40and Other Drawing type Etc.
Schedule: Sch. 5 TO Sch. XXS.
Type: Slip On (SORF), WNRF, Blind, Socket Weld, Orifice, WNRTJ, BLRTJ, Threaded, Groove & Tongue, Lap Joint, Square Flanges & As Per Clients Required.
Flanges Face Type: Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ).
OurDuplex S31803 Buttweld Pipe Fittings conforms to NACE MR0175/ISO 15156.
| Standard | WERKSTOFF NR. | UNS | GOST | AFNOR | JIS | BS | EN |
|---|---|---|---|---|---|---|---|
| S31803 | 1.4462 | S31803 | - | - | - | - | - |
| Grade | Ni | Mo | C | Mn | Si | P | S | Cr | N |
|---|---|---|---|---|---|---|---|---|---|
| S31803 | 4.5 - 6.5 | 2.5 - 3.5 | 0.03 max | 2.0 max | 1.0 max | 0.03 max | 0.02 max | 21.0 - 23.0 | 0.08 - 0.2 |
| Grade | Hardness (HB) | Tensile Strength | Yield Strength (0.2% offset) | Elongation |
|---|---|---|---|---|
| S31803 | 217 | 90 min. (ksi) | 65 min. (ksi) | 25 % |
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| ASME SA 815 Duplex Steel UNS S31803 Swedge Nipple | Duplex Steel UNS S31803 3D Elbow in Madagascar |
| ASTM A 815 Duplex Steel UNS S31803 Pipe Nipples | Duplex Steel UNS S31803 1.5D Elbow Trader in Libya |
| A815 Duplex Steel UNS S31803 Adapters in Egypt | Duplex Steel UNS S31803 1D Elbow Dealer in Chile |
| Duplex Steel UNS S31803 Lap Joint Stub Ends | Duplex Steel UNS S31803 45° Radius Elbow in Nigeria |
| Duplex UNS S31803 180° Radius Elbow Exporter | ANSI B16.9 UNS S31803 90° Radius Elbow Exporter |
As your one-stop manufacturing partner, Sunrise Industries maintains a complete inventory of ready-to-sell raw materials alongside custom parts fabrication and full engineering services. From prototyping to production, we provide everything at a single location—serving all industrial sectors and transforming manufacturing value chains.
