Features

ASTM A789/A789M Seamless and Welded Duplex Stainless Steel Tubing for General Service

Chemical Composition (wt.%)

UNS No.	C	Mn	P	S	Si	Ni	Cr	Mo	N	Cu	Others
S31803	0.030	2.00	0.030	0.020	1.00	4.5-6.5	22.0-23.0	3.0-3.5	0.14-0.20	–	–
S32205	0.030	2.00	0.030	0.020	1.00	4.5-6.5	22.0-23.0	3.0-3.5	0.14-0.20	–	–
S32750	0.030	1.20	0.035	0.020	0.80	6.0-8.0	24.0-26.0	3.0-5.0	0.24-0.32	0.50	–
S32760	0.030	1.00	0.030	0.010	1.00	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	1.00	0.040	0.030	0.75	2.5-5.0	23.0-28.0	1.00-2.00	–	–	–
S32906	0.030	0.80-1.50	0.030	0.030	0.80	5.8-7.5	28.0-30.0	1.50-2.60	0.30-0.40	0.80	–

Mechanical Properties

UNS No.	Tensile Strength (min, ksi [MPa])	Yield Strength (min, ksi [MPa])	Elongation 2in or 50mm (min. %)	Hardness (max, Brinell)
S31803	90 [620]	65 [450]	25	290
S32205	90 [620]	65 [450]	25	290
S32750	116 [800]	80 [550]	15	310
S32760	109 [750]	80 [550]	25	310
S32900	90 [620]	70 [485]	25	302
S32906	101 [700]	75 [515]	30	293

Technical Specifications

Specification	Value
Standard	ASTM A789/A789M Seamless and Welded Duplex Stainless Steel Tubing for General Service
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	Tubing OD: 6.35-127mm, Tubing WT: 0.5-12.7mm
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 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 tubing is often used in the oil and gas industry for various applications, including production tubing, flowlines, pipelines, and downhole tubular. Its high strength, corrosion resistance, and resistance to chloride stress corrosion cracking (SCC) make it suitable for offshore and onshore installations, especially in harsh environments.
Chemical Processing: Duplex stainless steel tubing is employed in chemical processing industries for applications such as reactors, heat exchangers, and piping systems where resistance to corrosion from acids, chlorides, and other aggressive chemicals is required.
Desalination Plants: Due to its excellent corrosion resistance and high strength, duplex stainless steel tubing finds application in desalination plants for seawater intake and brine outfall systems, as well as for various components within the desalination process.
Pulp and Paper Industry: Duplex stainless steel tubing is utilized in the pulp and paper industry for equipment such as digesters, bleach washers, and evaporators where resistance to corrosion and erosion is essential in handling corrosive chemicals and high temperatures.
Power Generation: In power generation facilities, duplex stainless steel tubing is used in heat exchangers, condensers, and piping systems where resistance to corrosion, erosion, and high temperatures is crucial for efficient operation and longevity of equipment.
Water Treatment: Duplex stainless steel tubing is employed in water treatment facilities for piping systems, filtration equipment, and tanks where resistance to corrosion from chlorides, abrasion, and erosion is necessary for long-term performance.
Structural Applications: Duplex stainless steel tubing can be used in structural applications such as bridges, architectural components, and marine structures where high strength and corrosion resistance are required for durability and reliability.