Stock seamless Duplex 2205 stainless steel pipe, hot finished & cold drawn options, ISO9001 & AS9100 certified, custom cut & bevel service for harsh corrosive pipeline projects.
Duplex 2205 Stainless Steel Pipe is widely used seamless duplex tubing designated UNS S32205, European standard grade 1.4462. It features a balanced dual-phase microstructure of 50% austenite and 50% ferrite, combining the high mechanical strength of ferritic steel and excellent toughness, weldability of austenitic stainless steel.
Manufactured in strict accordance with ASTM A790, ASTM A928 and NACE MR0175 standards, all pipes pass full third-party certification including ISO9001:2015 and AS9100. Unlike conventional 304 and 316L stainless tubing, Duplex 2205 pipe delivers nearly double yield strength and remarkable resistance to chloride pitting, crevice corrosion and chloride-induced stress corrosion cracking, performing reliably in seawater, sour gas, desulfurization flue and chloride wastewater pipeline environments.
We supply full stock seamless duplex pipe, supporting in-house band saw cutting, plasma cutting and pipe end bevel processing for direct welding installation. Matching duplex fittings, flanges, round bar and plate are available to provide one-stop duplex stainless pipeline solution for marine, petrochemical, power generation and oil & gas industries.
Duplex 2205 stainless steel pipe delivers a minimum yield strength of 450 MPa, nearly twice that of 316L austenitic stainless pipe. Under identical pressure ratings, thinner walls can be specified, significantly reducing pipeline weight and raw material cost without compromising pressure safety margins.
Optimized Cr–Mo–N alloying forms a dense passive film on both inner and outer surfaces, achieving a PREN of 34–36. Duplex 2205 effectively resists seawater brine, saline wastewater and H₂S sour media, eliminating the chloride stress corrosion cracking commonly experienced with 316L in offshore service.
High strength permits lightweight, thin-wall pipeline designs, lowering capital expenditure across procurement, welding and long-term maintenance. For corrosive industrial pipeline projects, Duplex 2205 provides extended service life with reduced total project cost compared to conventional austenitic grades.
| Product Form | Specification Range | Standard Length |
|---|---|---|
| Seamless Pipe (Main) | OD: 0.5–24 inch, Wall Thickness: Schedule 10 to Schedule 160 | 20ft / 40ft random lengths |
| Cold Drawn Precision Tube | OD: 0.25–6 inch, Thin wall tight tolerance | 12ft / 20ft fixed lengths |
| Welded Duplex Tube | OD: 1–16 inch, Standard wall schedules | 20ft stock lengths |
| U-Bend Heat Exchanger Tube | Custom bend radius per equipment drawing | Custom fabricated bundle lengths |
| Outer Diameter Range | Wall Schedule Options | Surface Finish | Typical Pipeline Usage |
|---|---|---|---|
| 0.5–4 inch | S10, S40, S80 | Cold drawn bright / Hot pickled | Instrument tubing, small process pipeline |
| 4–12 inch | S40, S80, S160 | Hot pickled seamless | Oil & gas transfer, desulfurization main pipe |
| 12–24 inch | S40, S80 heavy wall | Hot forged seamless blank | Offshore platform main process piping |
Custom heavy wall thick pipe, extra large OD seamless blank and pre-bevel cut lengths are available per client pipeline engineering drawings.
As a full-service duplex metal supply center, we provide complete pipe secondary processing to save customer site labor:
Smooth burr-free cut ends, low material loss, standard fixed-length cutting for bulk pipeline orders.
Fast processing for large diameter heavy wall pipe, V-type bevel ready for direct field welding.
Tight tolerance thin wall tubing for heat exchanger and instrument small bore lines.
All processed pipes get full deburr, interior cleaning and plastic end cap protection before delivery.
| Industry | Typical Pipeline System | Duplex 2205 Pipe Core Advantage |
|---|---|---|
| Marine & Offshore | Seawater cooling pipeline, offshore process transfer lines | Superior resistance to seawater chloride pitting & SCC |
| Oil & Gas Sour Service | Sour crude & natural gas transmission pipeline | NACE MR0175 certified anti-sulfide stress cracking |
| Power Generation FGD | Flue gas desulfurization absorption liquid piping | Resist mixed acid & sulfur-containing corrosive medium |
| Petrochemical Plant | Chloride wastewater, process medium circulation lines | Excellent crevice & pitting corrosion resistance |
| Chemical Processing | Brine, weak acid and salt medium delivery pipeline | Long service life under continuous corrosive flow |
| Pharmaceutical Sanitary System | Pure water & sanitary process small bore tubing | Non-toxic smooth surface without medium contamination risk |
Application Restriction: Not recommended for long-term continuous service above 315℃ high-temperature oxidation environment; select 310S alloy pipe for ultra-high temperature flue pipelines.
1. Machining Tip: Duplex 2205 material features cold work hardening tendency; adopt low cutting speed and sufficient coolant fluid during pipe cutting, threading and machining.
2. Welding Standard: Use matching ER2209 duplex welding filler wire; strictly control interpass temperature below 200℃ to avoid brittle sigma phase precipitation inside weld metal.
3. Storage Rule: Separate duplex pipe inventory from carbon steel to prevent galvanic contact corrosion; fit plastic end caps to avoid inner bore rust and dust contamination.
4. Pre-Fabrication Inspection: Perform PMI material positive identification before cutting to eliminate grade mixing errors.
5. Export Shipping Protection: Full anti-rust oil coating, plastic end caps, bundled and packed with moisture-proof wrapping for long-distance sea transportation.
1 Unique balanced 50/50 austenite-ferrite dual-phase microstructure combines ferritic high pressure strength and austenitic excellent weld toughness, breaking single-phase stainless pipeline performance limitations.
2 High chromium-molybdenum-nitrogen alloy formula forms dense passive film, drastically improving resistance to pitting, crevice and chloride stress corrosion cracking in saltwater pipeline systems.
3 Double yield strength enables thin-wall lightweight pipeline design, reducing total material procurement, welding construction and maintenance investment for corrosive industrial piping projects.
4 Complete in-house pipe cutting, beveling and finishing service supports fast rush order delivery matching Sabre Alloys metal service center operation standard.
5 Full ISO9001 & AS9100 certification system, each batch supplied complete MTR test documents to pass offshore, power and chemical plant third-party acceptance audit.
Customizable pipe parameters: Outer diameter, wall schedule, arbitrary fixed cut length, hot pickled / cold bright surface finish.
Special custom options: Extra large OD heavy wall seamless pipe, precision thin wall instrument tubing, pre-bevel welded-ready pipe blanks.
Provide professional pipeline material selection consultation, welding fabrication guidance and long-term bulk project framework cooperation contracts.
Small bore cold drawn bright tubing: Each pipe sealed with plastic end caps, wrapped anti-rust paper, packed into fumigated wooden crates with foam buffer protection.
Large size hot seamless pipe: Bundled with soft steel straps, rubber separators between layers, fixed on heavy-duty steel pallets and fully wrapped with moisture-proof stretch film.
Support FOB, CFR, CIF international trade terms, sea and land combined transportation. Complete certification documents supplied for overseas customs clearance and third-party pipeline project acceptance inspection.
| C | Cr | Fe | Mn | Mo | N | Ni | P | S | Si |
|---|---|---|---|---|---|---|---|---|---|
| Max | Max | Max | Max | Max | |||||
| .03% | 22%-23% | BAL | 2.0% | 3.0% -3.5% | .14% - .2% | 4.5%-6.5% | .03% | .02% | 1% |
Some of the typical applications of duplex steel grade 2205 are listed below:
The physical properties of grade 2205 stainless steels are tabulated below.
| Grade | Density (kg/m3) |
Elastic Modulus |
Mean Co-eff of Thermal Expansion (μm/m/°C) |
Thermal Conductivity (W/m.K) |
Specific Heat 0-100°C ( J/kg.K) |
Electrical Resistivity (nΩ.m) |
|||
|---|---|---|---|---|---|---|---|---|---|
| 0-100°C | 0-315°C | 0-538°C | at 100°C | at 500°C | |||||
| 2205 | 782 | 190 | 13.7 | 14.2 | - | 19 | - | 418 | 850 |
Corrosion Resistance
Grade 2205 stainless steel exhibits excellent corrosion resistance, much higher than that of grade 316. It resists localized corrosion types like intergranular, crevice and pitting. The CPT of this type of stainless steel is around 35°C. This grade is resistant to chloride stress corrosion cracking (SCC) at temperatures of 150°C. Grade 2205 stainless steels are apt replacements to austenitic grades, especially in premature failure environments and marine environments.
The super duplex gradesare even more resistant to corrosion.
Heat Resistance
Fabrication
Fabrication of all stainless steelsshould be done only with tools dedicated to stainless steel materials. Tooling and work surfaces must be thoroughly cleaned before use. These precautions are necessary to avoid cross contamination of stainless steel by easily corroded metals that may discolour the surface of the fabricated product.
Welding
Most standard welding methods suit this grade, except welding without filler metals, which results in excess ferrite. AS 1554.6 pre-qualifies welding for 2205 with 2209 rods or electrodes so that the deposited metal has the right balanced duplex structure.
Adding nitrogen to the shielding gas ensures that adequate austenite is added to the structure. The heat input must be maintained at a low level, and the use of pre or post heat must be avoided. The co-efficient of thermal expansion for this grade is low; hence the distortion and stresses are lesser than that in austenite grades.
Machinability
Although machinable, the high strengths of duplex stainless steels makes machining difficult. As an example, machining of 2205 is around 20% slower than for 304.
Machining can be enhanced by using the following rules:
Heat Treatment
Duplex stainless steelscannot be hardened by heat treatment. They can however be work hardened.
Solution treatment or annealing can be done by rapid cooling after heating to around 1100°C.
Weldability
Duplex stainless steelshave good weldability. All standard welding processes can be used. They are not quite as easily welded as the austenitic grades but low thermal expansion in duplex grades reduces distortion and residual stresses after welding. The recommended filler material for 2205 stainless steelis 2209.
| Product Form | Applicable Standards |
|---|---|
| Seamless Tube | EN 10216‑5, NFA 49‑217 |
| Seamless & Welded Tube | ASTM A789 |
| Seamless & Welded Pipe | ASTM A790 |
| Flanges & Valves | ASTM A182 |
| Fittings | ASTM A182, ASTM A815 |
| Plate, Sheet & Strip | ASTM A240, EN 10088‑2 |
| Bar & Shapes |
ASTM A276, ASTM A479,
EN 10088‑3
|
| Forged Billets | EN 10088‑3 |
| Grade | Cr (%) | Ni (%) | Mo (%) | N (%) | C (%) |
|---|---|---|---|---|---|
| 2205 Duplex | 22 | 5–6 | 3 | 0.14–0.20 | ≤ 0.03 |
| 316L | 16–18 | 10–14 | 2–3 | — | ≤ 0.03 |
| Property | 2205 Duplex | 316L Austenitic |
|---|---|---|
| Corrosion Resistance | Excellent in chloride & sour environments | Good; limited in high chloride |
| Strength | ~2× yield strength of 316L | Moderate |
| Toughness | Good (lower than 316L) | Excellent |
| Machinability | More difficult | Excellent |
| Weldability | Requires controlled procedures | Very good |
| Relative Cost | Higher | Lower |
| Product Form | Standard |
|---|---|
| Seamless & Welded Tubing | ASTM A789 / ASME SA789 |
| Seamless & Welded Pipe | ASTM A790 / ASME SA790 |
| Plate, Sheet & Strip |
ASTM A240 / ASME SA240EN 10088‑2 / EN 10088‑4
|
| Bars, Rods & Sections |
ASTM A276 / A479EN 10088‑3 / EN 10088‑5
|
| Boiler & Heat Exchanger Tubes |
ASTM A249,
A213,
A312
|
| General Flat‑Rolled Products | ASTM A480 |
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Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.
The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.
When you partner with Sunny Steel, you can stop worrying about meeting deadlines thanks to our responsive and timely service. You'll also say goodbye to unnecessary shopping around. Instead, you'll get white glove service from an expert who understands your needs and can get you the materials you need quickly.
