ASTM A789 / ASME SA-789 / UNS S32205 / W.Nr. 1.4462
Produced at our Ban Bueng, Chonburi mill in Thailand, UNS S32205 seamless tubes to ASTM A789 from Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd. serve seawater coolers, condensers, desalination plants and offshore hydraulic and instrument lines where chloride stress corrosion cracking limits austenitic grades. Designated EN 1.4462 (X2CrNiMoN22-5-3) in Europe, the grade is the higher-strength member of our duplex steel seamless tubes range, with a 485 MPa minimum yield under ASTM A789. Our sales office is in Bang Phli, Samut Prakan.
Duplex Steel UNS S32205 seamless tubeUNS S32205 / W.Nr. 1.4462
EN 10204 3.1 certificate / 3.2 on request
We size every tube in this grade by outside diameter and wall thickness. Say on the order whether the wall is average or minimum: ASTM A789 gives each basis its own tolerance, and the tube marking states which one applies. The table gives our production envelope.
ASTM A789 / ASME SA-789 governs the tube, and every ASTM A789 UNS S32205 seamless tube we ship is produced and tested to it. EN 10216-5 is the matching European seamless standard for the number 1.4462, so a data sheet that calls for seamless WNR 1.4462 tube can be cross-referenced to it. JIS G3463 (SUS329J3L) and GB/T 13296 (022Cr22Ni5Mo3N) list the equivalent grade on Japanese and Chinese specifications. Process and utility piping in the same grade is ordered by NPS and schedule as UNS S32205 seamless pipes to ASTM A790.
Every ASTM A789 UNS S32205 seamless tube passes either a hydrostatic test or a nondestructive electric test, ultrasonic or eddy current, at our option unless your order names one. Tension and flaring specimens are taken from every lot and two tubes per lot are hardness tested, with the full set repeated for each heat when a lot mixes heats. Results are reported on an EN 10204 3.1 (3.2 on request) certificate, and third-party inspection is available on request.
Compared with UNS S31803 seamless tubes, S32205 raises the minimum chromium to 22.0% (21.0% for S31803), molybdenum to 3.0% (2.5%) and nitrogen to 0.14% (0.08%), which narrows the spread in corrosion resistance from one heat to the next. The heat chemistry of each seamless S32205 duplex steel tube is reported against these ASTM A789 limits (% maximum unless a range is shown):
UNS S32205S32205
| Element | ASTM A789 Limit, UNS S32205 (%) |
|---|---|
| C (Carbon) | 0.030 max |
| Mn (Manganese) | 2.00 max |
| P (Phosphorus) | 0.030 max |
| S (Sulfur) | 0.020 max |
| Si (Silicon) | 1.00 max |
| Ni (Nickel) | 4.5 to 6.5 |
| Cr (Chromium) | 22.0 to 23.0 |
| Mo (Molybdenum) | 3.0 to 3.5 |
| N (Nitrogen) | 0.14 to 0.20 |
ASTM A789 sets a higher minimum yield for this grade in tube form: 485 MPa, against the 450 MPa that applies to S31803 under the same standard and to S32205 under ASTM A790. Your design code derives the allowable stress for a duplex steel S32205 seamless tube from these A789 minimums, so use the tube values, not the A790 pipe values.
| Property | ASTM A789 Requirement |
|---|---|
| Tensile Strength, min | 655 MPa (95 ksi) |
| Yield Strength, min | 485 MPa (70 ksi) |
| Elongation in 50 mm (2 in.), min | 25% |
| Hardness, max (Brinell) | 290 HBW |
| Hardness, max (Rockwell) | 30 HRC |
| Hardness, max (Vickers) | 290 HV |
That yield level is far above the minimum for 316L seamless tubes, so a cooler or condenser can often run a thinner wall at the same design pressure. S32205 is approved for sour service under NACE MR0175 / ISO 15156, provided the hardness and environmental limits of that standard are met. Every tube is delivered solution treated at 1020 to 1100 °C and rapidly cooled, the heat-treated condition ASTM A789 requires.
UNS S32205 duplex steel is listed under these designations in American, European, Japanese and Chinese standards.
The number 1.4462 is shared with S31803, so a drawing that names only the European number leaves the chemistry window open. An order for seamless 1.4462 duplex tube should also name UNS S32205 to fix the tighter ASTM A789 limits and the 485 MPa tube yield; the European designations serve as a cross-reference. Dual certification to UNS S31803 is available on request when the heat meets both grades.
We produce S32205 duplex stainless steel seamless tube from 6 mm to 720 mm OD and 1 mm to 65 mm wall, in lengths up to 22 m, quoted in metric or inch sizes. ASTM A789 sets the permitted variations below for tube up to 203.2 mm OD; for larger sizes, state the tolerance your design needs on the inquiry.
| OD, mm (in.) | OD Variation, mm | Average Wall | Minimum Wall | Cut Length, mm |
|---|---|---|---|---|
| Under 12.7 (1/2) | ±0.13 | ±15% | +30% / 0 | +3 / 0 |
| 12.7 to under 38.1 (1/2 to 1-1/2) | ±0.13 | ±10% | +20% / 0 | +3 / 0 |
| 38.1 to under 88.9 (1-1/2 to 3-1/2) | ±0.25 | ±10% | +20% / 0 | +5 / 0 |
| 88.9 to under 139.7 (3-1/2 to 5-1/2) | ±0.38 | ±10% | +20% / 0 | +5 / 0 |
| 139.7 to 203.2 incl. (5-1/2 to 8) | ±0.76 | ±10% | +20% / 0 | +5 / 0 |
Swipe sideways to see the full table.
Two notes to the table widen these limits. At 19 mm wall and above, or with an inside diameter of 60% of the OD or less, A789 permits ±12.5% on an average-wall order or +25.0% / 0 on a minimum-wall order. The cut-length figures cover lengths to 7.3 m; each further 3 m, or fraction of it, adds 3 mm to the plus limit, and that increase never exceeds 13 mm.
Thin-walled tube follows a separate roundness rule. Below 1.6 mm wall at 12.7 to 38.1 mm OD, below 2.4 mm at 38.1 to 88.9 mm and below 3.8 mm from 88.9 to 203.2 mm, a single high or low diameter reading may reach double the OD variation in the table, as long as the mean of those readings complies with the table.
Seamless 1.4462 duplex tube in S32205 goes where cooling water, brine or process fluid carries chlorides and the bundle or line must stay light. For the most aggressive seawater duties, super duplex UNS S32750 seamless tubes are the step up.
Surface condensers and cooling loops at coastal power plants pass seawater or brackish water through the tube bore, where resistance to chloride stress corrosion cracking keeps the bundle in service between inspections.
Thermal desalination evaporators and brine heaters run concentrated brine for long campaigns between cleanings, and seamless S32205 duplex steel tube is specified to resist the chloride pitting and stress corrosion cracking that such brine drives.
Shell-and-tube exchangers on offshore platforms cool gas, lube oil and produced water against seawater. Duplex steel S32205 seamless tube keeps those bundles lighter, which matters where topside weight is tightly budgeted.
Small-OD tubing from 6 mm carries hydraulic power, chemical injection and instrument signals on wellheads and topsides, and its ±0.13 mm OD tolerance below 38.1 mm suits compression-fitting connections.
Coolers and heaters in sulfuric and phosphoric acid production take S32205 duplex stainless steel seamless tube, which handles acid streams that also pick up chlorides from raw materials or process water.
Wet FGD scrubbers at power and industrial plants expose reheater bundles, quench coolers and instrument lines to acidic, chloride-laden condensate, a duty where seamless duplex tube is a common choice.
Bundling
Tubes grouped by size in wooden cases or strapped bundles, with plastic caps on both ends to keep bores clean.
Marking
Per ASTM A789 on every ASME SA-789 S32205 seamless tube, with your project tag numbers added on request.
Lengths
Straight lengths up to 22 m, or cut to the length on your tube sheet drawing.
Documents
EN 10204 3.1 (3.2 on request) certificate plus the export papers needed for customs clearance at your port.
Incoterms
FOB, CIF or CFR.
Markets
Deliveries within Thailand and export to Singapore, Malaysia, Vietnam, Indonesia, the Philippines and India.
Market prices for duplex steel UNS S32205 seamless tubes to ASTM A789 currently sit at roughly USD 6 to 12 per kg, as an indicative range only. Your quotation depends on OD, wall basis and thickness, length, quantity and the tests ordered, with small-OD, thin-wall and short-run tubing at the upper end. Send your size list to Thaida for a firm price.
Indicative only. Send your sizes and specification to Thaida for a firm quotation.
We produce duplex steel UNS S32205 seamless tubes at our factory, 154 Moo.1 Map Phai, Ban Bueng, Chonburi 20170, Thailand. Our sales team works from 89/18 Moo.15 Enterprize Park, Bangna-Trad Road, Bang Kaeo, Bang Phli, Samut Prakan 10540, Thailand. We give a lead time on every quotation, from stock where your sizes are on hand and otherwise from the next production run.
For most seawater and brackish-water condensers, S32205 is a sound choice, because its molybdenum and nitrogen levels and duplex structure suit chloride cooling water. Where the water runs hotter or more concentrated than your corrosion review accepts for a 22Cr grade, ask us to quote super duplex UNS S32750 on the same inquiry and compare.
As thin as your design code allows using the ASTM A789 minimums of 485 MPa yield and 655 MPa tensile, down to our 1 mm wall. Mind the thin-wall roundness rule: a 25.4 mm OD tube under 1.6 mm wall may read up to twice its ±0.13 mm OD variation at single points, so check tube-sheet hole clearances.
You can name eddy current on the order, and ASTM A789 then applies that nondestructive electric test to every tube in place of the hydrostatic test. Each test method covers only the tube sizes within the scope of its own practice, so for heavy-wall or large-OD sizes we confirm with the quotation whether eddy current or ultrasonic examination applies.
Small ODs from 6 mm upward, with the wall chosen to match your fitting system and pressure rating. For these sizes ASTM A789 allows Vickers hardness testing on tubing under 9.00 mm ID or under 1.65 mm wall, with 290 HV as the limit. Send the OD and wall pairs your fitting supplier lists with the inquiry.
Each tube is marked with the grade, ASTM A789, its heat number and size, and whether the wall is average or minimum, which A789 requires on the marking. The heat number ties every tube in a bundle to the chemistry, tension, flaring and hardness results on its EN 10204 3.1 (3.2 on request) certificate.
It checks ductility at the tube end. One specimen from one end of one tube in each lot is expanded with a 60° tool until the inside diameter has grown by at least 10%. ASTM A789 calls for this flaring test on seamless tube rather than a flattening test.
Request a Quote for Duplex Steel UNS S32205 Seamless Tubes
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