Features

ASTM A790/A790M Seamless and Welded Duplex Stainless Steel Pipe

Chemical Composition (wt.%)

UNS No.	C	Mn	P	S	Si	Ni	Cr	Mo	N	Cu	Other
S31803	0.03	2.0	0.03	0.02	1.0	4.5-6.5	21.0-23.0	2.5-3.5	0.08-0.20	–	–
S32205	0.03	2.0	0.03	0.02	1.0	4.5-6.5	22.0-23.0	3.0-3.5	0.14-0.20	–	–
S32304	0.03	2.5	0.04	0.04	1.0	3.0-5.5	21.5-24.5	0.05-0.60	0.05-0.20	0.05-0.60	–
S32550	0.04	1.5	0.04	0.03	1.0	4.5-6.5	24.0-27.0	2.9-3.9	0.10-0.25	1.50-2.50	–
S32750	0.03	1.2	0.035	0.02	0.8	6.0-8.0	24.0-26.0	3.0-5.0	0.24-0.32	0.5	–
S32760	0.03	1.0	0.03	0.01	1.0	6.0-8.0	24.0-26.0	3.0-4.0	0.20-0.30	0.50-1.00	W 0.50-1.00
S32900	0.08	1.0	0.04	0.03	0.75	2.5-5.0	23.0-28.0	1.00-2.00	–	–	–
S32906	0.03	0.80-1.50	0.03	0.03	0.8	5.8-7.5	28.0-30.0	1.50-2.60	0.30-0.40	0.8	–

Mechanical Properties

UNS No.	Tensile Strength (min, ksi [MPa])	Yield Strength (min, ksi [MPa])	Elongation (in 2 in. or 50 mm, min, %)	Hardness (max HBW)	Hardness (max HRC)
S31803	90 [620]	65 [450]	25	290	30
S32205	95 [655]	65 [450]	25	290	30
S32304	87 [600]	58 [400]	25	290	30
S32550	110 [760]	80 [550]	15	297	31
S32750	116 [800]	80 [550]	15	300	32
S32760	109 [750]	80 [550]	25	310	32
S32900	90 [620]	70 [485]	20	271	28
S32906	109-116 [750-800]	80-94 [550-650]	25	300	32

Technical Specifications

Specification	Value
Standard	ASTM A790/A790M Seamless and Welded Duplex Stainless Steel Pipe
Grade	UNS S31803, S32205 (SAF 2205, X2CrNiMoN22-5-3, EN 1.4462), S32304 (SAF 2304, X2CrNiN23-4, EN 1.4362), S32550 (EN 1.4507, F61, Ferralium 255, SAF 2507Cu), S32750 (X2CrNiMoN25-7-4, SAF 2507, F53, EN 1.4410), S32760 (EN 1.4501, F55, Zeron 100), S32900 (X3CrNiMoN27-5-2, EN 1.4460, AISI 329), S32906 (SAF 2906, EN 1.4477)
Manufacturing Process	Hot Rolled, Cold Worked
Seam Type	Seamless and Welded
Dimension	Pipe OD: NPS 1/8″-48″ (10.3-1219mm), Pipe WT: SCH 5S, 10S, 40S, 80S, XS, XXS
Length	3000-12000mm
Delivery Condition	Solution Annealed, pickling
Inspection Certificate	EN 10204 Type 3.1 (Mill Test Certificate), EN 10204 Type 3.2 (Witness Testing or 3rd Party Inspection)
Tests	Chemical analysis, Tensile test, Intergranular corrosion test, Metallographic examination

Packing

Both ends are plain or beveled to an angle of 30°+5°/0° as per ANSI B16.25 and equipped with plastic pipe caps or bevel protectors. Small-diameter pipes are packaged in wooden crates, and large-diameter pipes are wrapped in woven bags.

Application

Oil and Gas Industry: Duplex stainless steel pipes are used in oil and gas exploration and processing equipment due to their high strength and excellent corrosion resistance, particularly in environments containing chlorides and other harsh chemicals.
Chemical Processing: These pipes are suitable for chemical processing plants that require piping systems that can withstand aggressive chemicals and high temperatures.
Desalination Plants: Duplex pipes are used in desalination plants for water transport, and other components are exposed to brackish or seawater due to their resistance to chloride and seawater corrosion.
Pulp and Paper Manufacturing: In the pulp and paper industry, duplex stainless steel pipes are used to handle liquids containing chlorides and for bleaching equipment, which requires excellent corrosion resistance.
Pollution Control Equipment: The superior corrosion resistance of duplex stainless steel is beneficial in scrubbers and other pollution control equipment that are exposed to corrosive gases and chemicals.
Power Generation: Duplex stainless steel pipes are used in the power generation sector, particularly in flue-gas desulfurization systems, where their corrosion resistance to sulfurous compounds is valuable.
Marine Applications: The high strength and corrosion resistance in marine environments make duplex stainless steel pipes suitable for structural and water-exposed components on ships and offshore platforms.
Heat Exchangers: Duplex stainless steel pipes are often used in heat exchangers in various industrial processes due to their ability to withstand high temperatures and corrosive environments.
Fire Fighting Systems: These pipes are used in fire fighting systems, especially in marine or coastal facilities, where durability and resistance to corrosion are necessary.
Water and Wastewater Treatment: Duplex pipes are used in water and wastewater treatment facilities to handle and transport water with varying chemical compositions and potentially high levels of corrosive substances.