ASTM A789 Duplex Stainless Steel Tube

1. Standard: ASTM A789, ASME SA 789
2. Seamless Tube Size: 1/2” to 8”
3. Welded Tube Size: 6” to 24”
4. Outer Diameter: 6.0mm-630mm
5. Wall Thickness: 1mm to 50mm

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Product Introduction

ASTM A789 duplex stainless steel tube, contains about 50% ferrite and 50% austenite. ASTM A789 pipe has better stress corrosion resistance in neutral chloride solution and H2S than 304L, 316L austenitic stainless steel. This pipe is particularly suitable for the temperature range of -50°F/+600°F. We are a 2507 supplier with 15+ export experience. We can provide seamless pipes and welded pipes, including small diameters to large diameters. Contact us for more information and free quotes!

ASTM A789 duplex steel tube standard:

ASTM A789: Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service

Grades: S31803, S32205, S32750, S32760, S32550

ASME B36.19: Specification for Stainless Steel Pipes

ASTM A789 Stainless Steel Tube Suppliers

ASTM A789 Duplex Stainless Steel Tube Specifications

Standard	ASTM A789 / A789M, ASME SA789
Seamless pipe & Tube Size	1/2" to 8" IN
Welded pipe & Tube Size	6" to 24" IN
Outer Diameter	6.0-630mm
Schedules	5s, 10s, 20, 40s, 40, 60, 80s, 80, 100, 120, 140, 160, XXH.
Wall Thickness	1mm to 50mm
Finish	Polished, AP (Annealed & Pickled), BA (Bright & Annealed), MF
Form	Round, Square, Rectangular, Hydraulic, Straight or 'U' bent Tubes Etc.
Length	Single Random, Double Random, and Cut Length.
End	Plain End, Beveled End, Treaded

ASTM A789 Standard Dimensional Tolerance

ASTM A789	Size, Outside Diameter, [mm]	Permissible Variations, in OD	Permissible Variations, in WT	Permissible Variations, in Length	Thin Wall Tube
	D＜12.7	±0.13mm	±15%	3mm	...
	12.7-38.1	±0.13mm	±10%	3mm	WT<1.6mm
	38.1-88.9	±0.25mm	±10%	5mm	WT<2.4mm
	88.9-139.7	±0.38mm	±10%	5mm	WT<3.8mm
	139.7-203.2	±0.76mm	±10%	5mm	WT<3.8mm

ASTM A789 Duplex Stainless Steel Tube Chemical Composition

Grade	C≤	Mn≤	P≤	S≤	Si≤	Ni	Cr	Mo	N	Cu
S31803	0.03	2.00	0.03	0.02	1.00	4.5–6.5	21.0–23.0	2.5–3.5	0.08–0.20	-
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	-
S32750	0.03	1.20	0.035	0.02	0.80	6.0-8.0	24.0-26.0	3.0-5.0	0.24-0.32	0.5
S32760	0.05	1.00	0.03	0.01	1.00	6.0-8.0	24.0-26.0	3.0-4.0	0.20-0.30	0.50–1.00

ASTM A789 Material Mechanical Properties

Mechanical properties	Tensile, min, ksi[MPa]	Yield, min, ksi[MPa]	Elongation, %(min)	Hardness, HB(max)
S31803	90 [620]	65 [450]	25	290
S32205	95 [655]	65 [450]	25	290
S32750	116 [800]	80 [550]	15	300
S32760	109 [750]	80 [550]	25	300

ASTM A789 Tube Heat Treatment

UNS Designation	Temperature °F [°C]	Quench
S31803	1870-2010℉(1020-1100℃)	Rapid cooling in air or water
S32205	1870-2010℉(1020-1100℃)	Rapid cooling in air or water
S32750	1880-2060℉(1025-1125℃)	Rapid cooling in air or water
S32760	2010-2085℉(1100-1140℃)	Rapid cooling in air or water

Physical Properties of UNS S31803 and S32205

Grade	Density (kg/m3)	Elastic Modulus (GPa)	Mean Co-eff of Thermal Expansion (μm/m/°C)			Thermal Conductivity (W/m.K)		Specific Heat 0-100°C ( J/kg.K)	Electrical Resistivity (nΩ.m)

			0-100°C	0-315°C	0-538°C	at 100°C	at 500°C
2205	782	190	13.7	14.2	-	19	-	418	850