ASTM A790 S32205 Duplex Stainless Steel Pipe for Oil Gas Industry

Why do pipelines in the oil and gas industry continue to suffer from pitting corrosion, stress corrosion cracking (SCC), or even sudden failure when exposed to harsh environments-such as those characterized by high chloride content, H₂S exposure, and low temperatures? The key lies in whether the material's chemical composition, PREN value, compliance standards, and mechanical properties truly meet the demanding service conditions.

 

GNEE is a supplier of ASTM A790 S32205 duplex stainless steel pipes, boasting a monthly production capacity of 350 tons. We offer reliable delivery services for duplex steel pipes within 15 to 25 days, accompanied by complete inspection documentation. All ASTM A790 S32205 duplex stainless steel pipes manufactured by us comply with NACE MR0175 / ISO 15156 standards. We offer both seamless and welded pipe options; for high-pressure transmission lines, seamless pipes are typically the preferred choice, whereas welded pipes are selected for large-diameter applications.

UNS S32205 stainless steel cryogenic pipes contain 22–23% Cr, 4.5–6.5% Ni, 3.0–3.5% Mo, and 0.14–0.20% N. Their PREN (Pitting Resistance Equivalent Number) typically exceeds 35, ensuring safe application in acidic media environments containing hydrogen sulfide (H₂S).

UNS S32205 stainless steel round pipes typically achieve an impact energy of ≥100 J at cryogenic temperatures of -46°C. Furthermore, a hardness level of HRC ≤ 28 is generally required to prevent Sulfide Stress Cracking (SSC) in H₂S-containing environments, thereby ensuring that structural integrity is maintained even under extreme conditions.

 

UNS S32205 stainless steel seamless pipe specification

Pipe Specifications	ASTM A790 / ASME SA 790
Pipe Standard	DIN, JIS, ASTM, EN, GB, AISI, ASME
Pipe Thickness	0.3mm – 50 mm
Seamless Pipe Outer Diameter	6.00 mm OD up to 250 mm OD, Sizes up to 12" NB
Pipe Schedule	SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
Pipe & Tube End	Plain End, Beveled End, Treaded Pipe.

 

Chemical Composition of ASTM A790 S32205 pipe

Grade	C≤	Mn≤	P≤	S≤	Si≤	Ni	Cr	Mo	N	Cu
S32205	0.03	2.00	0.03	0.02	1.00	4.5–6.5	22.0–23.0	3.0–3.5	0.14–0.20	–

 

Mechanical Properties duplex 2205 ss seamless pipe

Mechanical properties	Tensile, min, ksi[MPa]	Yield, min, ksi[MPa]	Elongation, %(min)	Hardness, HB(max)
S32205	95 [655]	65 [450]	25	290

 

ASTM A790 Gr UNS S32205 Pipe Tolerance Chart

O0.0D0.0 +/- INCHES	WALL THICKNESS INCHES	O0.0D0.0 INCHES
0.0025	Over 0.0165 - 0.0220	3-1/2" - 5" incl0.0
0.0020	0.0083 - 0.0165
0.0010	Over 0.0065 - 0.0134	1 - 1-1/2" incl0.0
0.0008	0.0025 - 0.0065
0.0010	Over 0.0065 - 0.0134	1/2" - 1" incl0.0
0.0005	0.0025 - 0.0065
0.0013	Over 0.0065 - 0.0109	2" - 2-1/2" incl0.0
0.0012	0.0032 - 0.0065
0.0014	Over 0.0109 - 0.0165
0.0011	Over 0.0049 - 0.0083	1-1/2" - 2" incl0.0
0.0010	0.0025 - 0.0049
0.0012	Over 0.0083 - 0.0148
0.0020	Over 0.0165 - 0.0220	2-1/2" - 3-1/2" incl0.0
0.0014	0.0032 - 0.0165

 

 

ASTM A790 UNS S32205 Pipe Weight Chart

NPS	Wall Thickness		Outside Diameter		Weight		Weight
	inch	milimeter	inch	milimeter	kg/Mtr	Schedule	Lb/ft
1/2″	0.0109	2.0769	0.0840	21	1.0268	40 STD	0.0851
	0.0147	3.0734			1.0621	80 STD	1.0088
3/4″	0.0113	2.0870	1.0050	27	1.0684	40 STD	1.0131
	0.0154	3.0912			2.0195	80 STD	1.0474
1″	0.0133	3.0378	1.0315	33	2.0501	40 STD	1.0679
	0.0179	4.0547			3.0325	80 STD	2.0172
1 1/4″	0.0140	3.0556	1.0660	42	3.0385	40 STD	2.0273
	0.0191	4.0851			4.0464	80 STD	2.0997
1 1/2″	0.0145	3.0683	1.0900	48	4.0048	40 STD	2.0718
	0.0200	5.0080			5.0409	80 STD	3.0361

 

Heat Treatment Of Duplex Grade S32205 Straight-Seam Welded Pipe

Process	Value
Annealing Temperature °F [°C]	1870 to 2010 [1020 to 1100]
Quenching	Quick Cooling in Water or Air

 

DIN 1.4462 Pipe and Tube Pressure Rating chart

ASTM A790 UNS S32205 Pipe O.D. (in.)	Wall Thickness of ASTM A790 UNS S32205 Pipe (inches)
	0.028	0.035	0.083	0.049	0.065	0.095	0.109	0.120
	Working Pressure (psig)
1/8	7900	10100
1/4	3700	4800		7000	9500
5/16		3700		5400	7300
3/8		3100		4400	6100
1/2		2300		3200	4400
3/4			4000	2200	3000	4600
1			2900		2200	3400	3900	4300

 

Non-Destructive Testing (NDT)

Oil and gas pipelines typically operate under high pressure; consequently, even the slightest defect can lead to a catastrophic accident.
UT (Ultrasonic Testing): Inspects the interior of the pipe wall for the presence of laminations or cracks.
ET (Eddy Current Testing): Inspects for surface defects.
Hydrostatic Test: A mandatory procedure, typically conducted at pressure levels higher than those used for standard industrial piping.

 

"All S32205 pipes are handled exclusively with nylon slings and non-metallic padding to eliminate the risk of carbon steel contamination, ensuring the long-term performance of the material in sour service environments."

FAQ

Q: What is the difference between S31803 and S32205?
A: While often used interchangeably, S32205 is an upgraded version of S31803. S32205 has higher minimum levels of Chromium (22%), Molybdenum (3.0%), and Nitrogen (0.14%), which ensures better corrosion resistance and a higher PREN value (typically ≥ 35). Most modern

projects specify S32205 to ensure maximum reliability.

 

Q: Can S32205 pipes be used in low-temperature environments?
A: Yes, S32205 has good toughness at sub-zero temperatures. We perform Charpy V-Notch Impact Testing at -40°C or -46°C per project requirements to ensure the pipes do not suffer from brittle failure in cold climates or offshore applications.