Duplex 2205 Steel Pipe

HT PIPE is a specialized Duplex 2205 steel pipe supplier and manufacturer in China, supplying seamless and welded duplex stainless steel pipes to global markets for 15+ years. Our Duplex 2205 pipes comply with ASTM A790, ASTM A928, ASME SA790, and EN 10216-5 (1.4462). With roughly double the yield strength of 316L and substantially better chloride resistance, Duplex 2205 is the cost-effective alternative for demanding oil & gas, chemical, and marine applications. 

Duplex 2205 Pipe Specifications

Parameter	Specification
Material Grade	Duplex 2205 / UNS S32205 / UNS S31803 / EN 1.4462 / F51 / F60
Applicable Standards	ASTM A790 (seamless & welded), ASTM A928 (EFW), ASME SA790, EN 10216-5, NACE MR0175
Size Range	OD 1/2" – 48" (DN15 – DN1200)
Wall Thickness	Sch 5S, 10S, 40S, 80S, 160
Type	Seamless, Welded (EFW/ERW), Cold Drawn, Hot Rolled
Length	Single Random (5-7m), Double Random (11-13m), Cut-to-length
End Finish	Plain End (PE), Beveled End (BE)

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Chemical Composition - Duplex 2205 (UNS S32205)

Element	C	Cr	Ni	Mo	N	Mn	Si	P	S	Fe
%	≤0.03	22.0-23.0	4.5-6.5	3.0-3.5	0.14-0.20	≤2.0	≤1.0	≤0.03	≤0.02	Balance

 

Duplex 2205 vs 316L vs Super Duplex 2507

Property	Duplex 2205	316L	Super Duplex 2507
UNS	S32205/S31803	S31603	S32750
Yield Strength	≥ 450 MPa	≥ 170 MPa	≥ 550 MPa
PREN	~35	~24	~42
Relative Cost	1.5-2x vs 316L	1x (baseline)	3-4x vs 316L
Best For	Chloride + strength needs	General corrosion	Severe chloride + high strength

 

Key Applications

Oil & Gas: Flowlines, subsea manifolds, topside piping, gas injection lines (NACE MR0175)

Chemical Processing: Pressure vessels, heat exchangers handling chloride-containing media

Desalination: Reverse osmosis (RO) high-pressure piping, brine reject lines

Marine & Offshore: Firewater systems, seawater lift pumps, ballast water piping

Pulp & Paper: Digester vessels, bleaching towers, chemical recovery boilers

Structural: Bridges, architectural elements in coastal environments

 

Why HT PIPE for Duplex 2205?

Large inventory: We stock 2205 pipes from 1/2" to 24" in common schedules.

Ferrite content testing: Every heat verified for 40-60% ferrite content per ASTM E562.

Impact tested at -46°C: Charpy V-notch tests per ASTM A923 Method C included for critical applications.

NACE MR0175 certified: Suitable for H₂S sour service environments up to Level VII.

Intergranular corrosion test: ASTM A923 Method C (or ASTM A262 Practice E) performed on each lot.

Global logistics: Container, breakbulk, and air freight options with full export documentation.

 

Duplex 2205 Pipe Price Reference

Duplex 2205 pipe pricing is more stable than nickel alloys, driven primarily by chromium, molybdenum, and nickel content. Current market range for ASTM A790 seamless UNS S32205 pipe is depending on size, schedule, and order volume. Contact us for an exact quotation based on your specific project requirements.

 

Frequently Asked Questions

Q: Can Duplex 2205 pipe be used in seawater?

Yes, Duplex 2205 offers good resistance to flowing seawater and is widely used in offshore piping. However, for stagnant or low-flow seawater at temperatures above ~20°C, super duplex 2507 may be preferred due to its higher PREN value (42 vs 35).

 

Q: What is the maximum operating temperature for Duplex 2205?

The recommended maximum continuous operating temperature for Duplex 2205 is 300°C (572°F). Above this, the duplex microstructure can undergo detrimental phase changes (475°C embrittlement and sigma phase precipitation above 300°C).

 

Q: Is post-weld heat treatment required for Duplex 2205?

For most applications, post-weld heat treatment is not required if proper welding procedures are followed (controlled heat input 0.5-2.5 kJ/mm, interpass temperature ≤ 150°C). However, solution annealing at 1020-1100°C followed by water quenching may be specified for critical service.

 

Q: What welding consumables are used for Duplex 2205?

For TIG/GTAW: ER2209 filler wire. For SMAW: E2209-15/16 electrodes. These consumables are typically over-alloyed with nickel (8-10%) to ensure the correct austenite-ferrite balance in the weld metal.

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