Duplex 2205 Pipes & Tubes
Duplex 2205 pipes & tubes supplied to ASTM A790 / A928 from our Mumbai stockyard. Duplex 2205 has a roughly 50/50 austenite-ferrite microstructure, which gives it about twice the yield strength of standard austenitic grades together with markedly better resistance to chloride stress corrosion cracking. Its higher strength often allows a thinner wall for the same duty, which can offset the higher price per kilogram.
Governing Standards for Duplex 2205 Pipes & Tubes
State the standard on your enquiry and we will confirm stock against it.
| Standard | Covers |
|---|---|
| ASTM A790 / A928 | Seamless and welded pipe |
Duplex 2205 Chemical Composition (%)
Composition and mechanical values are the limits set by the governing ASTM specification and are given for reference. The mill test certificate supplied with your consignment carries the actual heat analysis.
| Element | S31803 | S32205 |
|---|---|---|
| Carbon | 0.030 max | 0.030 max |
| Chromium | 21.0 – 23.0 | 22.0 – 23.0 |
| Nickel | 4.5 – 6.5 | 4.5 – 6.5 |
| Molybdenum | 2.5 – 3.5 | 3.0 – 3.5 |
| Nitrogen | 0.08 – 0.20 | 0.14 – 0.20 |
| Manganese | 2.00 max | 2.00 max |
| Phosphorus | 0.030 max | 0.030 max |
| Sulphur | 0.020 max | 0.020 max |
Duplex 2205 Pipes & Tubes Specifications
Duplex 2205 Pipes & Tubes — Chemical Composition
| Grade | C | Mn | P | S | Si | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|---|---|
| TP 304 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 8.0–11.0 | — | N 0.10 |
| TP 304L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 8.0–13.0 | — | N 0.10 |
| TP 316 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0–18.0 | 11.0–14.0 | 2.00–3.00 | N 0.10 |
| TP 316L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 16.0–18.0 | 10.0–15.0 | 2.00–3.00 | N 0.10 |
| TP 321 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0–19.0 | 9.0–12.0 | — | Ti ≥ 5 × C |
| TP 347 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 17.0–19.0 | 9.0–13.0 | — | Nb ≥ 10 × C |
| TP 310S | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 24.0–26.0 | 19.0–22.0 | — | — |
| TP 317L | 0.035 | 2.00 | 0.045 | 0.030 | 1.00 | 18.0–20.0 | 11.0–15.0 | 3.00–4.00 | N 0.10 |
Note: Per ASTM A312 / A240. Values are maximum % by weight unless a range is shown. ASTM A312 permits 0.035% max carbon on L grades, where ASTM A240 plate specifies 0.030% max.
Duplex 2205 Pipes & Tubes — Mechanical Properties
| Grade | Tensile Strength (min) | Yield Strength 0.2% (min) | Elongation (min) | Hardness (max) |
|---|---|---|---|---|
| TP 304 | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB / 192 HBW |
| TP 304L | 485 MPa (70 ksi) | 170 MPa (25 ksi) | 35% | 90 HRB / 192 HBW |
| TP 316 | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB / 192 HBW |
| TP 316L | 485 MPa (70 ksi) | 170 MPa (25 ksi) | 35% | 90 HRB / 192 HBW |
| TP 321 | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB / 192 HBW |
| TP 347 | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB / 192 HBW |
| TP 310S | 515 MPa (75 ksi) | 205 MPa (30 ksi) | 35% | 90 HRB / 192 HBW |
Note: Specified minimum values in the solution-annealed condition, per ASTM A312 / A240. Elongation is measured in 50 mm (2 in.).
Duplex 2205 Pipes & Tubes — Size Range & Supply Condition
| Parameter | Range |
|---|---|
| Nominal bore | 1/2" NB to 24" NB (larger on enquiry) |
| Outside diameter | 6 mm to 610 mm |
| Wall thickness | Schedule 5S, 10S, 20, 30, 40 / 40S, 60, 80 / 80S, 100, 120, 140, 160, XXS |
| Manufacturing type | Seamless, ERW, EFW and LSAW |
| Length | Single random 4–7 m, double random 9–13 m, or cut to length |
| End finish | Plain end, bevelled end (30° ± 5°), threaded |
| Surface | Annealed & pickled, bright annealed, mirror or satin polished |
| Governing standards | ASTM A312 / A358 / A790 / A106 / A53, ASME B36.10M & B36.19M |
Duplex 2205 Pipes & Tubes — Pipe Dimensions & Weight Chart
| NPS | OD (mm) | Sch 10S | Sch 40S | Sch 80S |
|---|---|---|---|---|
| 1/2" | 21.3 | 2.11 mm / 1.02 kg/m | 2.77 mm / 1.29 kg/m | 3.73 mm / 1.65 kg/m |
| 3/4" | 26.7 | 2.11 mm / 1.30 kg/m | 2.87 mm / 1.72 kg/m | 3.91 mm / 2.24 kg/m |
| 1" | 33.4 | 2.77 mm / 2.13 kg/m | 3.38 mm / 2.55 kg/m | 4.55 mm / 3.30 kg/m |
| 1 1/4" | 42.2 | 2.77 mm / 2.75 kg/m | 3.56 mm / 3.46 kg/m | 4.85 mm / 4.55 kg/m |
| 1 1/2" | 48.3 | 2.77 mm / 3.17 kg/m | 3.68 mm / 4.13 kg/m | 5.08 mm / 5.52 kg/m |
| 2" | 60.3 | 2.77 mm / 4.01 kg/m | 3.91 mm / 5.54 kg/m | 5.54 mm / 7.62 kg/m |
| 2 1/2" | 73.0 | 3.05 mm / 5.36 kg/m | 5.16 mm / 8.80 kg/m | 7.01 mm / 11.63 kg/m |
| 3" | 88.9 | 3.05 mm / 6.58 kg/m | 5.49 mm / 11.51 kg/m | 7.62 mm / 15.57 kg/m |
| 4" | 114.3 | 3.05 mm / 8.53 kg/m | 6.02 mm / 16.38 kg/m | 8.56 mm / 22.75 kg/m |
| 5" | 141.3 | 3.40 mm / 11.78 kg/m | 6.55 mm / 22.18 kg/m | 9.53 mm / 31.56 kg/m |
| 6" | 168.3 | 3.40 mm / 14.09 kg/m | 7.11 mm / 28.80 kg/m | 10.97 mm / 43.38 kg/m |
| 8" | 219.1 | 3.76 mm / 20.35 kg/m | 8.18 mm / 43.36 kg/m | 12.70 mm / 65.88 kg/m |
| 10" | 273.0 | 4.19 mm / 28.31 kg/m | 9.27 mm / 61.44 kg/m | 12.70 mm / 83.08 kg/m |
| 12" | 323.8 | 4.57 mm / 36.67 kg/m | 9.53 mm / 75.27 kg/m | 12.70 mm / 99.30 kg/m |
Note: Outside diameter and wall thickness per ASME B36.19M. Weight is calculated for austenitic stainless at 8.0 g/cm3 and is indicative — actual weight varies with grade and mill tolerance. Each cell shows wall thickness / weight per metre.
Duplex 2205 Pipes & Tubes — Square & Rectangular Sections
| Section | Size range | Wall thickness | Length |
|---|---|---|---|
| Square | 10 x 10 mm to 200 x 200 mm | 0.8 mm to 8 mm | 6 m / 12 m / cut to length |
| Rectangular | 10 x 20 mm to 200 x 400 mm | 0.8 mm to 8 mm | 6 m / 12 m / cut to length |
| Round (welded) | 6 mm to 610 mm OD | 0.6 mm to 12 mm | 6 m / 12 m / cut to length |
| Finish | Mill, matt, satin, No. 4 brushed, No. 8 mirror | — | — |
Note: Welded stainless steel hollow sections, supplied in 304/304L, 316/316L and 202. Other sizes are rolled to order.
Duplex 2205 Pipes & Tubes — Physical Properties
| Property | SS 304 / 304L | SS 316 / 316L |
|---|---|---|
| Density | 8.00 g/cm³ | 8.00 g/cm³ |
| Melting range | 1400–1450 °C | 1375–1400 °C |
| Modulus of elasticity | 193 GPa | 193 GPa |
| Thermal conductivity (100 °C) | 16.2 W/m·K | 16.3 W/m·K |
| Specific heat (0–100 °C) | 500 J/kg·K | 500 J/kg·K |
| Thermal expansion (0–100 °C) | 17.2 µm/m·°C | 15.9 µm/m·°C |
| Electrical resistivity | 720 nΩ·m | 740 nΩ·m |
| Max continuous service temp. | ≈ 870 °C | ≈ 925 °C |
| Magnetic response (annealed) | Non-magnetic | Non-magnetic |
Note: Values at 20 °C unless stated. Thermal expansion matters when austenitic stainless is welded to carbon steel.
Duplex 2205 Pipes & Tubes — Equivalent Grades Across Standards
| ASTM / AISI | UNS | EN / DIN | EN Name | JIS | GB |
|---|---|---|---|---|---|
| 304 | S30400 | 1.4301 | X5CrNi18-10 | SUS 304 | 06Cr19Ni10 |
| 304L | S30403 | 1.4307 | X2CrNi18-9 | SUS 304L | 022Cr19Ni10 |
| 316 | S31600 | 1.4401 | X5CrNiMo17-12-2 | SUS 316 | 06Cr17Ni12Mo2 |
| 316L | S31603 | 1.4404 | X2CrNiMo17-12-2 | SUS 316L | 022Cr17Ni12Mo2 |
| 321 | S32100 | 1.4541 | X6CrNiTi18-10 | SUS 321 | 06Cr18Ni11Ti |
| 347 | S34700 | 1.4550 | X6CrNiNb18-10 | SUS 347 | 06Cr18Ni11Nb |
| 310S | S31008 | 1.4845 | X8CrNi25-21 | SUS 310S | 06Cr25Ni20 |
| 430 | S43000 | 1.4016 | X6Cr17 | SUS 430 | 10Cr17 |
Note: Cross-reference for enquiries written against European, Japanese or Chinese standards. Equivalents are close but not always identical — check the composition limits before substituting.
Duplex 2205 Pipes & Tubes — Ordering & Supply
| Parameter | Detail |
|---|---|
| Minimum order quantity | 5 kg (mixed sizes within a grade can be combined to reach the MOQ) |
| Price basis | Ex-works Mumbai, FOB or CIF — quoted per kg, per metre or per piece depending on the form |
| Lead time | Ready stock dispatched in 1–3 working days; mill orders typically 2–6 weeks |
| Certification | Mill test certificate to EN 10204 3.1 as standard; 3.2 with third-party witness, IBR and NACE MR0175 on request |
| Testing available | PMI, IGC (ASTM A262), hydrostatic, ultrasonic, radiographic, impact and hardness testing |
| Third-party inspection | Bureau Veritas, TÜV, DNV, SGS, Lloyd's Register, Intertek, RITES and client/EPC inspection |
| Packing | Wooden crates or pallets, plastic caps on pipe ends, VCI wrapping where required, seaworthy export packing |
| Payment terms | Advance, against proforma invoice, or LC at sight for export orders |
| Supply area | Across India and export to the Middle East, Europe, the USA, Africa and South East Asia |
| Product form | Pipes |
Note: Cut lengths, non-standard sizes and special certification are available on request. Prices are quoted against grade, size, schedule and quantity.
Values shown are the specified minima and maxima published in the governing standards and are given for guidance. The mill test certificate supplied with your consignment reports the actual results for that heat.
When to specify Duplex 2205 for pipe work
Choose 2205 where 316 is marginal on chlorides, where stress corrosion cracking is a risk, or where higher strength allows a lighter section. It is widely specified for offshore, seawater handling, chemical process and pressure vessels. Note the temperature limits below before specifying it for hot or cryogenic service.
Products in this range
Frequently Asked Questions
- What is the difference between S31803 and S32205?
- S32205 is a tightened version of S31803, with narrower ranges for chromium, molybdenum and especially nitrogen (0.14–0.20% against 0.08–0.20%). The higher guaranteed nitrogen improves pitting resistance and the stability of the weld. Most modern 2205 is dual-certified to both; if corrosion performance is critical, specify S32205.
- What temperature limits apply to Duplex 2205?
- Duplex grades are generally limited to about 300°C in continuous service. Above roughly 300°C the ferrite phase suffers embrittlement, and prolonged exposure between about 600°C and 950°C precipitates sigma phase, which severely reduces toughness and corrosion resistance. Duplex is also not used for cryogenic service, where austenitic grades retain toughness.
Send your Duplex 2205 Pipes & Tubes requirement
Give us the size, schedule or thickness, quantity and standard and we will confirm stock and send a firm price. Minimum order quantity 5 kg, mill test certificate to EN 10204 3.1 with every consignment.