ASTM A789 UNS S32205 U Bend Tube for Heat Transfer Equipment

GNEE is a renowned manufacturer, exporter, distributor, stockist, and supplier of stainless steel heat exchanger tubes. Our products comply with national and international raw material quality standards.

Our ASTM A789 UNS S32205 U-bend tubes offer a high thermal conductivity of up to 15.1 W/(m·K), significantly improving heat transfer efficiency. They can withstand ≥10⁶ cyclic loads within a temperature range of -50℃ to 300℃, perfectly suited for the alternating temperature operating conditions of heat exchangers.
In corrosive media common in heat exchange systems, the corrosion rate of these U-bend tubes for heat transfer equipment is as low as ≤0.07 mm/year in 3% NaCl simulated cooling water and ≤0.05 mm/year in 5% HCl solution (80℃), fully complying with ASTM A789 and NACE MR 0175/ISO 15156 standards.
Furthermore, the UNS S32205 U-bend tubes are designed with high dimensional accuracy (bending radius tolerance ±5%), ensuring a tight fit with the heat exchanger tube sheet and minimizing the risk of leakage. Compared to traditional austenitic stainless steel tubes, this extends equipment service life by more than 30%.

ASME SA789 UNS S32205 U-Bend Boiler Tube Specifications

Sizes / Thickness	OD: 0.25"- 6" ; W.T: 0.02" - 0.5" or as required by clients
Manufacture	Shall be made by the seamless or welded process with no filler metal added.
Heat Treatment	For seamless tubes, as an alternate to final heat treatment in a continuous furnace or batch-type furnace, immediately following hot forming while the temperature of the tubes is not less than the specified minimum solution treatment temperature, tubes may be individually quenched in water or rapidly cooled by other means. S32205---(1020-1100℃) Quench:rapid cooling in air water
Length	As required by clients
Surface Condition	All tubes shall be free of excessive mill scale, suitable for inspection. A slight amount of oxidation will not be considered as scale.
Bending Radius	From 1.5*OD(Outside Diameter) To 1500mm, ≤1.5*OD,necessary To agree precision of geometrics
Straight Tubes	max length 35000mm

 

ASTM A789/ASME AS789 Duplex Steel Tubing Chemical Requirements

UNS	C	Mn	P	S	Si	Ni	Cr	Mo	N	Cu	Other
S31803	0.03	2	0.03	0.02	1	4.5-6.5	21-23	2.5-3.5	0.08-0.2	...	...
S32205	0.3	2	0.3	0.2	1	4.5-6.5	22-23	3-3.5	0.14-0.2	...	...

 

SA789 S32205 Heat Exchanger Tubes Mechanical Properties

Grade	Tensile Strength (MPa) min	Elongation (% in 50mm) min	Yield Strength 0.2% Proof (MPa) min	Hardness
				Rockwell C (HR C)	Brinell (HB)
UNS S32205	621	25	448	31 max	293 max

 

Application

Chemical Processing: Ideal for vessels, piping, and equipment in acidic or chloride-containing environments.
Oil & Gas: Used in exploration, processing, and transport equipment where high strength and chloride resistance are critical.
Marine Environments: Withstands polluted seawater and high chloride concentrations.
Pulp & Paper Industry: Used in digesters, liquor tanks, and paper machines.

 

GNEE Stainless Steel is an independent stockist and fabricator of 2205 stainless steel heat exchanger tubing. With an extensive inventory and superior fabrication capabilities, we are able to meet the needs of most projects, whether it is stock product or custom fabrication. Email: sales@gneestainless.com

Markings

Marking prescribed in specification A450/A 450M, The marking shall indicate whether the tubing is seamless or welded.

Note:

Mill test certificates will be issued according to EN10204.3.

All tubes shall be supplied as per applicable ASTM A789 /A789M Specification.

Packing and Marking

Packed in bundles or ply wooden box wrapped in plastic, and suitably protected for sea-worthily delivery or as requested.