Amigo Impex is a manufacturer, stockist and supplier of Duplex S31803 bars and rods in Mumbai, India, with export operations since 2013. Duplex steel S31803 bar, designated UNS S31803 and typically containing 22% chromium, 5% nickel and 3% molybdenum, pairs a two-phase ferritic-austenitic microstructure with 2.5 to 3.5% molybdenum, so the bar resists chloride stress corrosion cracking and pitting while holding a 448 MPa minimum yield strength. Supply runs against ASTM A276 / ASME SA-276, with heats commonly dual-certified to UNS S32205. Round bar spans 3 mm to 450 mm in diameter, with hex, square, flat, bright and forged sections beside it in black, bright and centreless ground finishes, cut to length in-house.
An EN 10204 3.1 mill test certificate travels with each order, and PMI or corrosion testing can be added. Machine shops turn the grade into pump shafts, valve stems, fasteners and tie rods for chloride-exposed plant. Dispatch covers PAN India, with exports moving to the USA, the Gulf, Europe and Asia under ISO 9001:2015 and ISO 45001:2018-certified systems.
We manufacture and supply Duplex S31803 bars and rods to ASTM A276 / ASME SA-276 in five bar types. The table sets out the ordering range, including grade, sizes, forms, conditions, finishes and certification.
3 bar-form specifications cover the grade. ASTM A276 governs general supply, A479 applies when the order names pressure-retaining service, and A484 carries dimensional tolerances.
| Standard | Scope |
|---|---|
| ASTM A276 / ASME SA-276 | Stainless steel bars and shapes |
| ASTM A479 / ASME SA-479 | Stainless bars for boilers and pressure vessels |
| ASTM A484 / ASME SA-484 | General requirements and tolerances for stainless bars |
Chromium, molybdenum and nitrogen give the 22Cr duplex family its pitting resistance, while nickel balances the two-phase structure. UNS S31803 bar is certified against the ASTM A276 limits below.
| Element | Limit (%) |
|---|---|
| Carbon (C) | 0.030 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.030 max |
| Sulphur (S) | 0.020 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 21.0 to 23.0 |
| Nickel (Ni) | 4.5 to 6.5 |
| Molybdenum (Mo) | 2.5 to 3.5 |
| Nitrogen (N) | 0.08 to 0.20 |
| Iron (Fe) | Balance |
The mechanical properties below apply to annealed Duplex S31803 bar supplied in hot-finished or cold-finished form. Density is 7.80 g/cm³, used for per-metre weight on quotations.
Where material is dual-certified to UNS S32205, the tensile minimum rises to 655 MPa (95 ksi) per ASTM A276; yield, elongation and hardness limits are unchanged.
| Property | Value |
|---|---|
| Tensile Strength (min) | 620 MPa (90 ksi) |
| Yield Strength 0.2% (min) | 448 MPa (65 ksi) |
| Elongation in 50 mm (min) | 25% |
| Hardness (max) | 290 HBW |
One duplex grade answers several national designations. Drawings may identify the grade by designations such as 1.4462, SUS 329J3L or Duplex 2205; the table provides the corresponding designations for UNS S31803, and the table maps each callout.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S31803, dual-certified S32205 |
| Europe (EN / W.Nr) | 1.4462 / X2CrNiMoN22-5-3 |
| Japan (JIS) | SUS 329J3L |
| China (GB/T) | 022Cr22Ni5Mo3N / S22253 |
| France (AFNOR) | Z3 CND 22-05 Az |
As a duplex steel S31803 round bar supplier, we stock the following size ranges across the available shapes. Part lengths cut to order, so a full bar isn't a purchase condition, and tolerances follow ASTM A484.
| Shape | Size Range | Length |
|---|---|---|
| Round Bar / Rod | 3 mm to 450 mm diameter | 100 mm to 6000 mm |
| Hex Bar | 2 mm to 100 mm across flats | 100 mm to 6000 mm |
| Square Bar | 4 x 4 mm to 100 x 100 mm | 100 mm to 6000 mm |
| Flat Bar | 3 x 20 mm to 12 x 100 mm | 100 mm to 6000 mm |
5 types make up the stock range, split by cross-section and production route.
Bundled supply with protective wrapping protects threads and ground surfaces in transit; short-cut pieces travel boxed. Consignments carry the mill test certificate, packing list and commercial invoice, with markings applied to the order. As a duplex steel S31803 bar supplier and exporter, Amigo Impex dispatches PAN India and ships export orders to the USA, the Gulf, Europe and Asia. Ex-stock material moves in 1 to 2 days; mill orders run to around 30 days.
The EN 10204 3.1 certificate reports the chemical composition and mechanical properties for each order of S31803 bars and rods. PMI verification, hardness checks and dimensional inspection run before packing, and pitting or intergranular corrosion tests are added on request. Third-party inspection is supported. Amigo Impex holds ISO 9001:2015 and ISO 45001:2018 certification and supplies PED-compliant material.
Duplex S31803 bars and rods are priced at approximately ₹350–₹600 per kg in India and US$4–US$7 per kg internationally. Rates vary with section size, shape, length, finish, quantity, testing, certification, and alloy surcharges. Amigo Impex issues dated quotations against the required specification and quantity.
Contact Amigo Impex today for current Duplex S31803 bars and rods pricing.
Request a Quote60–70 tonnes held in Mumbai, with urgent requirements dispatched within one to two days.
AS 9120B, PED, ISO 9001:2015 and ISO 45001:2018, with an MTC on every order.
Cutting, machining, threading, fabrication and testing all handled at our own Mumbai facility.
Original mill certificates plus our own test reports, so every batch can be traced back.
Non-standard sizes and specifications made to order.
Dispatched from Mumbai to every major Indian city, and exported to USA, Gulf, Europe, Asia
Yes, Duplex 2205 is the common trade name, and S31803 is the UNS designation for a 22Cr duplex stainless steel, so 2205 bar drawings are supplied from this stock.
Yes, heats melted inside the tighter S32205 chemistry window are certified to both designations, and the certificate then lists S31803 and S32205 together. Name the dual requirement on the order.
Stocked round bar covers 3 mm to 450 mm in diameter, hex 2 mm to 100 mm across flats, square to 100 x 100 mm and flat 3 x 20 mm to 12 x 100 mm, in lengths up to 6000 mm.
Five types ship from stock: round, hex, square, flat, and hollow bars. Centreless ground and polished bar is stocked in common sizes; threaded bar and precision-ground tolerances (h6/h7) are made to order.
Duplex stainless steel UNS S31803 bars are machined into pump shafts, valve stems, fasteners, tie rods and seawater-system components, the main uses where chloride pitting or stress corrosion rules out austenitic bars.
S31803 bar carries 448 MPa minimum yield against 205 MPa for annealed 316 bar, and it resists the chloride stress corrosion cracking that austenitic grades suffer above about 60°C.
Duplex S31803 bars and rods are priced at approximately ₹350–₹600 per kg in India and US$4–US$7 per kg internationally.
Shafting, stems, studs and machined internals in chloride service take this bar across 8 industries.
