Duplex 2205 Stainless Steel Pipe & Tube

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Product Overview

Om Export India Pvt Ltd is a premier manufacturer, stockist, and global exporter of high-performance Duplex 2205 Stainless Steel Pipes and Tubes (UNS S32205 / UNS S31803 / WNR 1.4462). Duplex 2205 is a 22% Chromium, 5% Nickel, 3% Molybdenum, and nitrogen-enhanced austenitic-ferritic dual-phase stainless steel engineered to deliver nearly double the mechanical yield strength of standard austenitic stainless steels (such as 304L or 316L) combined with exceptional resistance to pitting, crevice corrosion, and chloride-induced stress corrosion cracking (SCC).

Our Duplex 2205 seamless and welded piping systems are manufactured strictly in accordance with ASTM A790, ASME SA790, ASTM A789, and international marine/offshore design codes. Designed for high-stress environments across offshore drilling, seawater desalination, petrochemical refining, and caustic processing, our inventory features tight dimensional tolerances, controlled phase balances (40–60% ferrite/austenite), and verified PREN values (≥ 35) to prevent premature operational failure.

Dual-Phase Microstructure: Combines the superior fracture toughness of austenite with the elevated yield strength and chloride SCC resistance of ferrite.
Pitting & Crevice Protection: PREN ≥ 35 ensures outstanding endurance in aggressive chloride, bromide, and sour gas (H2S) environments.
High Mechanical Efficiency: High yield strength (≥ 550 MPa / 80 ksi) enables design engineers to reduce pipe wall thicknesses and overall structural load.

Key Features

High Yield & Tensile Strength: Roughly double the yield strength of standard austenitic grades, enabling thin-wall lightweight structural designs.
Stress Corrosion Cracking (SCC) Immunity: Excellent resistance to chloride- and sulfide-induced SCC in marine and downhole sour environments.
Pitting & Crevice Corrosion Resistance: PREN value ≥ 35 protects against aggressive halide solutions and acidic process streams.
Uniform Phase Balance: Precision heat treatment maintains a consistent 50/50 austenite-ferrite microstructural matrix.
Erosion-Corrosion Durability: Superior surface hardness and flow resistance mitigate cavitation and erosion under high fluid velocities.
Weldability & Machinability: Fully weldable using GTAW, GMAW, and SAW methods with over-alloyed 2209 matching filler metals.

Product Specifications

Specification Parameter	Standard Specification / Technical Value
Nominal Size Range (Seamless)	1/8" NB to 12" NB (6.00 mm OD up to 323.8 mm OD)
Nominal Size Range (Welded / EFW)	1/2" NB to 48" NB (15.0 mm OD up to 1219.2 mm OD)
Wall Thickness & Schedules	SCH 5S, SCH 10S, SCH 40S, SCH 80S, SCH 120, SCH 160, SCH XXS (0.3 mm to 50.0 mm WT)
Manufacturing Standards	ASTM A790, ASME SA790, ASTM A789, ASME SA789, ASTM A928, EN 10216-5
Heat Treatment Condition	Solution Annealed at 1020°C – 1100°C (1870°F – 2010°F) followed by rapid water quench
Standard Lengths	Single Random Length (SRL), Double Random Length (DRL), Cut Lengths up to 12,000 mm / 25,000 mm
Surface Finishes	Solution Annealed & Pickled (AP), Bright Annealed (BA), Mechanically Polished (180, 240, 320, 400, 600 Grit), Mirror Finish (8K)
End Configurations	Plain Square Cut End (PE), Beveled End (BE per ASME B16.25), Threaded & Coupled (NPT)

Dimensions & Sizes

Nominal Pipe Size (NPS)	Outside Diameter (OD mm / in.)	Wall Thickness (WT mm / in.)	Nominal Schedule	Weight (kg/m)	Weight (lb/ft)
1/4" NB	13.72 mm (0.540")	1.65 mm (0.065")	SCH 10S	0.50 kg/m	0.34 lb/ft
1/4" NB	13.72 mm (0.540")	2.24 mm (0.088")	SCH 40S	0.64 kg/m	0.43 lb/ft
1/4" NB	13.72 mm (0.540")	3.02 mm (0.119")	SCH 80S	0.81 kg/m	0.54 lb/ft
1/2" NB	21.34 mm (0.840")	2.11 mm (0.083")	SCH 10S	1.02 kg/m	0.68 lb/ft
1/2" NB	21.34 mm (0.840")	2.77 mm (0.109")	SCH 40S	1.29 kg/m	0.85 lb/ft
1/2" NB	21.34 mm (0.840")	3.73 mm (0.147")	SCH 80S	1.65 kg/m	1.09 lb/ft
3/4" NB	26.67 mm (1.050")	2.11 mm (0.083")	SCH 10S	1.30 kg/m	0.87 lb/ft
3/4" NB	26.67 mm (1.050")	2.87 mm (0.113")	SCH 40S	1.71 kg/m	1.13 lb/ft
3/4" NB	26.67 mm (1.050")	3.91 mm (0.154")	SCH 80S	2.23 kg/m	1.48 lb/ft
1" NB	33.40 mm (1.315")	2.77 mm (0.109")	SCH 10S	2.13 kg/m	1.43 lb/ft
1" NB	33.40 mm (1.315")	3.38 mm (0.133")	SCH 40S	2.54 kg/m	1.68 lb/ft
1" NB	33.40 mm (1.315")	4.55 mm (0.179")	SCH 80S	3.29 kg/m	2.17 lb/ft
1" NB	33.40 mm (1.315")	6.35 mm (0.250")	SCH 160	4.30 kg/m	2.85 lb/ft
1-1/2" NB	48.26 mm (1.900")	2.77 mm (0.109")	SCH 10S	3.16 kg/m	2.12 lb/ft
1-1/2" NB	48.26 mm (1.900")	3.68 mm (0.145")	SCH 40S	4.11 kg/m	2.72 lb/ft
1-1/2" NB	48.26 mm (1.900")	5.08 mm (0.200")	SCH 80S	5.49 kg/m	3.63 lb/ft
2" NB	60.33 mm (2.375")	2.77 mm (0.109")	SCH 10S	3.99 kg/m	2.64 lb/ft
2" NB	60.33 mm (2.375")	3.91 mm (0.154")	SCH 40S	5.52 kg/m	3.66 lb/ft
2" NB	60.33 mm (2.375")	5.54 mm (0.218")	SCH 80S	7.60 kg/m	5.03 lb/ft
2" NB	60.33 mm (2.375")	8.74 mm (0.344")	SCH 160	11.29 kg/m	7.47 lb/ft
3" NB	88.90 mm (3.500")	3.05 mm (0.120")	SCH 10S	6.56 kg/m	4.34 lb/ft
3" NB	88.90 mm (3.500")	5.49 mm (0.216")	SCH 40S	11.47 kg/m	7.58 lb/ft
3" NB	88.90 mm (3.500")	7.62 mm (0.300")	SCH 80S	15.51 kg/m	10.26 lb/ft
3" NB	88.90 mm (3.500")	11.13 mm (0.438")	SCH 160	21.67 kg/m	14.34 lb/ft
4" NB	114.30 mm (4.500")	3.05 mm (0.120")	SCH 10S	8.50 kg/m	5.62 lb/ft
4" NB	114.30 mm (4.500")	6.02 mm (0.237")	SCH 40S	16.32 kg/m	10.80 lb/ft
4" NB	114.30 mm (4.500")	8.56 mm (0.337")	SCH 80S	22.67 kg/m	15.00 lb/ft
4" NB	114.30 mm (4.500")	13.49 mm (0.531")	SCH 160	34.05 kg/m	22.53 lb/ft
6" NB	168.28 mm (6.625")	3.40 mm (0.134")	SCH 10S	14.04 kg/m	9.30 lb/ft
6" NB	168.28 mm (6.625")	7.11 mm (0.280")	SCH 40S	28.69 kg/m	18.99 lb/ft
6" NB	168.28 mm (6.625")	10.97 mm (0.432")	SCH 80S	43.21 kg/m	28.60 lb/ft
6" NB	168.28 mm (6.625")	18.26 mm (0.719")	SCH 160	68.59 kg/m	45.39 lb/ft
8" NB	219.08 mm (8.625")	8.18 mm (0.322")	SCH 40S	43.20 kg/m	28.55 lb/ft
8" NB	219.08 mm (8.625")	12.70 mm (0.500")	SCH 80S	65.63 kg/m	43.39 lb/ft
8" NB	219.08 mm (8.625")	23.01 mm (0.906")	SCH 160	112.97 kg/m	75.92 lb/ft

Chemical Composition

Element	UNS S31803 Composition (%)	UNS S32205 (F60 / Opt.) Composition (%)	EN 1.4462 Composition (%)
Carbon (C, Max)	0.030	0.030	0.030
Chromium (Cr)	21.00 – 23.00	22.00 – 23.00	21.00 – 23.00
Nickel (Ni)	4.50 – 6.50	4.50 – 6.50	4.50 – 6.50
Molybdenum (Mo)	2.50 – 3.50	3.00 – 3.50	2.50 – 3.50
Nitrogen (N)	0.08 – 0.20	0.14 – 0.20	0.10 – 0.22
Manganese (Mn, Max)	2.00	2.00	2.00
Silicon (Si, Max)	1.00	1.00	1.00
Phosphorus (P, Max)	0.030	0.030	0.035
Sulfur (S, Max)	0.020	0.020	0.015
Iron (Fe)	Balance	Balance	Balance

Mechanical Properties

Mechanical Property	UNS S31803 / S32205 Value	Technical Limit / Test Standard
Tensile Strength (Min)	655 – 800 MPa (95 – 116 ksi)	ASTM A790 / ASTM A789 Requirement
Yield Strength (0.2% Offset, Min)	450 – 550 MPa (65 – 80 ksi)	ASTM A790 / ASTM A789 Requirement
Elongation in 2 in. / 50 mm (Min)	15% – 25%	ASTM A790 Standard Spec
Hardness (Rockwell / Brinell, Max)	32 HRC / 293 HBW Max	NACE MR0175 / ISO 15156 Compliance
Density	7.80 g/cm³ (0.28 lb/in³)	Physical Property at 20°C
Melting Point Range	1350°C – 1420°C (2460°F – 2590°F)	Thermal Property
Charpy V-Notch Impact Toughness	≥ 80 J at -40°C (-40°F)	ASTM A923 Method B verification

Standards & Specifications

Governing Code / Standard	Standard Scope & Product Type
ASTM A790 / ASME SA790	Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Pipe
ASTM A789 / ASME SA789	Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service
ASTM A928 / ASME SA928	Ferritic/Austenitic (Duplex) Stainless Steel Pipe Electric Fusion Welded with Addition of Filler Metal
ASTM A815 / ASME SA815	Wrought Ferritic, Ferritic/Austenitic, and Martensitic Stainless Steel Piping Fittings
EN 10216-5 / EN 10217-7	Seamless and Welded Steel Tubes for Pressure Purposes (Grade 1.4462 / X2CrNiMoN22-5-3)
NACE MR0175 / ISO 15156	Petroleum and Natural Gas Industries — Materials for use in H2S-containing Environments in Oil and Gas Production
ASME B36.19M / B36.10M	Stainless Steel and Wrought Steel Pipe Dimensional Standards

Applications

Duplex 2205 stainless steel pipes and tubes are utilized across demanding offshore, chemical processing, and energy generation sectors:

Offshore Oil & Gas: Subsea flowlines, riser pipes, production manifolds, gas injection loops, and topside process piping in sour gas fields.
Chemical & Petrochemical Processing: Reactor vessels, organic and inorganic acid production circuits, heat exchangers, and PVC manufacturing.
Desalination & Seawater Systems: High-pressure Reverse Osmosis (RO) feed lines, brine discharge manifolds, and marine intake piping.
Pulp & Paper Manufacturing: Digester piping, bleach plant washer vats, liquor heaters, and suction roll shells.
Pollution Control & Flue Gas Cleaning: Flue Gas Desulfurization (FGD) wet scrubbers, spray header banks, and effluent evaporation tubing.
Marine Shipbuilding: Cargo piping for chemical tankers, seawater ballast pipework, and propeller shaft sleeving.

Frequently Asked Questions

Q1: What is the main metallurgical difference between UNS S31803 and UNS S32205?
UNS S32205 is a restricted, higher-end composition of Duplex 2205 that specifies higher minimum levels of Chromium (22.0% vs. 21.0%), Molybdenum (3.0% vs. 2.5%), and Nitrogen (0.14% vs. 0.08%). This tighter composition guarantees superior corrosion resistance, higher PREN (≥ 35), and better phase balance control compared to basic UNS S31803.

Q2: Why is Duplex 2205 superior to standard 316L stainless steel in marine applications?
Duplex 2205 provides roughly twice the mechanical yield strength of 316L and substantially greater resistance to chloride pitting, crevice attack, and stress corrosion cracking due to its balanced duplex microstructure and higher molybdenum/nitrogen content.

Q3: What is the maximum recommended operating temperature for Duplex 2205 piping?
Duplex 2205 is generally restricted to operating temperatures between -50°C and 300°C (-58°F to 572°F). Prolonged exposure above 300°C can result in 475°C embrittlement and precipitation of intermetallic phases (such as Sigma phase), which reduce fracture toughness and corrosion resistance.

Q4: What non-destructive and destructive tests are conducted on Duplex 2205 tubes?
Each production lot undergoes ASTM A923 (Methods A, B, or C) testing to ensure the absence of harmful intermetallic phases, microstructural ferrite count determination (40–60%), ASTM G48 ferric chloride pitting tests, 100% Eddy Current / Hydrostatic pressure testing, and Ultrasonic examination.