U-bend tubes

We bring forth an exclusive range of U-bend tubes, which are known for their superior quality and excellent functionality.

Feedwater Heater Tubes 
Standard:ASME SA556 Chemical Compostion

Grade	C %	Si %	Mn %	P %	S %
B2	0.27 max	0.10 min	0.29-0.93	0.030 max	0.030 max
C2	0.30 max	0.10 min	0.29-1.06	0.030 max	0.030 max

Mechanical Properties

Grade	Tensile Strength MPA	Yield Strength MPA	Hardness HRB
B2	410 min	260 min	79 min
C2	480 min	280 min	89 min

Each U bend tube of our range is rigorously quality checked by our team of talented professionals on every stage of production to deliver the clients defect free best quality products. These U bend tubes can be custom designed in various diameters as per the requirements of our clients.

Application: Boilers, heat exchangers, super heaters, condensers

Production Standard, Grade, Steel No:

ASTM A688/A688M-Welded Austentic Steel Feedwater Heater Tubes.

ASTM A 312/213/269,DIN 17458/2462,BS3605/1,JIS, ASME SA556G3429/3459,ISO1129/2037/9329,GB/T14975/14976/13296 and so on.

Material:

TP304,TP304L,TP316,TP316L,TP321,TP310S,TP347H,TP316Ti, Carbon steel,alloys and so on.

Proces:

The removal of beads is done as per standard specifications.

Bead is cold worked.

It is brought in level with the base metal.

Before heat treatment on tube mill, bead rolling is made in-line.

This will help in recrystallization of weld structure.

The weld structure will also homogenize faster in annealing process.

Length: unbending length or fix length

Mill test certificate: according to EN 10204 3.2

Packing: Wooden cases, bundle or plastic bags, plywood boxes

Oil-dip, Varnish, Passivation, Phosphating, Shot Blasting.

Features :

• 'U' bending is done by cold working process.
• 'U' bending is done to the required radius as per customer drawings.
• The bend portion and six inch leg is stress relieved by resistance heating.
• Inert gas (Argon) is passed through it at the required flow rate to avoid oxidation in ID.
• The radius is checked for its OD and wall thinning with the recommended specification.
• The physical properties and micro-structure is checked at three different position.
• Visual inspection for waviness and cracks is done with Dye Penetrant Test.
• Each tube is then hydro tested at the recommended pressure to check for leakage.
• Cotton ball test is done to check the ID cleanliness of the tube.
• Thereafter pickled, dried, marked and packed.

U-bend tubes are widely used in heat-exchanger systems. Heat-exchanger equipment on the basis of seamless stainless U-tubes is essential in strategically important and critical fields — nuclear and petrochemical machine building.

A tube-bending line, that was installed at Huawei in the end of 2007, allows to produce U-tubes as per such standards:

1. ASTM A688/A688M

2. ASTM A803/A803M

3. ASTM A556/A556M, ASME SA-556

4. ASME SA-688

At present Huawei has purchased the equipment for production of the following product range:

View our U bend Steel Tubes for Heat exchanger...

Carbon & Alloy	Ferrite	Austenite	Duplex	Super Duplex	Ni-alloys	Titanium
A179 T11 T12 T22	TP410	TP 304 / 304L TP 316 / 316L TP 316Ti TP 317 / 317L TP 321 TP347	S31803 S32205	S32750 S32760	N06600 N08020 N00880 N08825 N08904	Gr.2

Tubes of other alloys and steel grades can be produced upon agreement.
Technical requirements

Straight tubes for bending:
ASTM/ASME SA 179; SA 213; ASTM B 163; ASTM B 729; ASTM B 407; ASTM B 423; ASTM A 789

U-bend Tubes:

-TEMA RCB 2.31 Standards of the Tubular Exchanger Manufacturers Association (9th edition).
-ASTM A688 Standard specification for welded tubes of austenite corrosion resistant steel grade designed for feed water boilers.
-ASTM B163 Standard technical requirements for tubes of nickel and nickel alloy for condensers and heat exchangers.
-Customer specifications.