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Duplex Steel 2205 Pipes & Tubes

The most widely used duplex grade — offering twice the strength of 316L with superior resistance to pitting, crevice corrosion and stress corrosion cracking.

Product Overview

Duplex 2205 is the most widely used duplex stainless steel grade in the world. It is a 22% chromium, 3% molybdenum, 5-6% nickel, nitrogen-alloyed duplex stainless steel. Its microstructure is a mix of austenite and ferrite, which gives it excellent mechanical properties and outstanding corrosion resistance. Duplex 2205 offers twice the yield strength of standard austenitic grades like 304 or 316L, while maintaining excellent toughness and weldability. Steel Emporium stocks Duplex 2205 pipes and tubes in seamless and welded forms, meeting ASTM A790, A789, and NACE MR0175 requirements for the most demanding industrial applications.

Key Advantages & Features

Superior PREN Value

Typically offers a PREN of 34-36, ensuring higher resistance to localized corrosion.

Offshore Durability

Excellent performance in subsea environments and brackish water systems.

Fatigue Resistance

High mechanical strength leads to high fatigue resistance in corrosive media.

Chemical Composition (%)
GradeCMnSiCrNiMoNPS
Duplex 2205 0.030 max 2.00 max 1.00 max 22.0 - 23.0 4.5 - 6.5 3.0 - 3.5 0.14 - 0.20 0.030 0.020
Mechanical & Physical Properties
PropertyMinimum Value (Duplex 2205)
Tensile Strength (MPa)655 MPa (95 ksi)
Yield Strength 0.2% Offset (MPa)450 MPa (65 ksi)
Elongation (% in 50mm)25%
Hardness (Brinell)293 HB max
Pitting Resistance (PREN)34.0 min
Density (kg/m³)7800
International Equivalent Grades
UNSWerkstoff No.EN NameCommon Name
S31803 / S322051.4462X2CrNiMoN22-5-3Duplex 2205
S318031.4462X2CrNiMoN22-5-3Duplex 2205 (Original)
Duplex 2205 Pipe Weight Chart (Kg/Mtr)
NB SizeOD (mm)SCH 10SSCH 40SSCH 80S
1/2"21.341.271.622.11
3/4"26.671.692.202.90
1"33.402.093.244.24
1.5"48.263.115.417.25
2"60.333.935.447.48
3"88.905.8411.2915.27
4"114.3011.0716.0722.32
6"168.2816.2828.2642.56
*Theoretical weights based on density 7.80 g/cm³. Actual weight may vary slightly.

Industrial Applications

Offshore Rigs

Seawater cooling systems & fire water pipes.

Acid Plants

Processing of organic & fatty acids.

Desalination

High-pressure pumps and RO piping.

Petrochemical

Refinery heat exchangers & pressure vessels.

FGD Systems

Flue gas desulfurization in power plants.

Shipbuilding

Chemical tankers & propulsion systems.

Frequently Asked Questions

Duplex 2205 offers the best combination of high strength, excellent corrosion resistance, and cost-effectiveness. Its PREN of 34+ makes it far superior to 316L, while its yield strength of 450 MPa is nearly double that of standard austenitic grades.

Duplex 2205 has twice the yield strength of 316L (450 MPa vs 170 MPa), better resistance to pitting and stress corrosion cracking, and similar or better general corrosion resistance — making it ideal for upgrading from 316L in demanding applications.

Yes, Duplex 2205 is magnetic due to its approximately 50% ferritic microstructure. This is a key difference from fully austenitic grades like 304 or 316.

Duplex 2205 is generally used at temperatures below 300°C (572°F). Above this, the material can suffer from 475°C embrittlement, which reduces toughness significantly.

Duplex 2205 pipes are covered by ASTM A790 (seamless and welded pipes), ASTM A789 (tubes), and NACE MR0175 for sour service. Filler metal ER2209 is used for welding.

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Quick Specification
StandardASTM A790 / A789
UNS No.S31803 / S32205
NB Sizes1/2" to 24" NB
SchedulesSCH 10S to XXS
ProcessSeamless / Welded
MTC3.1 Certified
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