U-bend steel tubes

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.

  • OD 9.5mm – 38.1mm
  • WT up to 6.35mm
  • Bending radii 1.25 x OD up to 1700mm
  • Bends can be supplied in accordance with TEMA R / ASTM SA/A556
  • Leg length up to 15000mm
  • Heat treatment where required by electric furnance or direct resistance
  • Hydrotesting up to 10,000 psi

Measuring, Cutting, Deburring and Cleaning

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

Standard for U bend Tubes

The semi-finished product for U bend tubes are heat exchanger tubes, manufactured and supplied according to DIN 28180 and ASTM A179.

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.

“U bend tubes for heat exchangers applied mostly in Oil & Gas plants, Chemical & Petrochemical plants, Refineries, Power plants, Renewable energy plants.”
  • Object medium: 10% sodium
  • hydroxide+5% sodium hypochlorite
  • Shell Diameter: ø 800
  • Working Pressure: 1.5mpa
  • Working Temperature: 40º C-90º C
  • Heat Exchange Surface Area: 100M2
  • Material: Gr1\Gr2

Packing
Any type of packing is available according to customer need to worldwide destinations.

  • For roadfreight in timber fingers or skids.
  • In strong open or closed wooden boxes depending destination.
  • Each bundle is protected with plastic sheets.
  • Customers can provide their own packing or Salem can prepare a packing plan.
  • Detailed packings lists are attached to wooden cases to give quick and clear identification of contents.

ASTM A213 ASME SA213 Seamless Alloy Carbon Steel Heat Exchanger U Tubes for Boilers

Materials – U Bend Tube

‘U’ bends are produced, controlled and measured fully in accordance with relevant standards.

Carbon SteelSA 179 / A 179
Carbon SteelSA 210 / A 210
Carbon SteelSA 334 / A 334
Stainless SteelSA 213 / A 213
Duplex Stainless SteelSA 789 / A 789
Copper & Cu AlloysSB 111 / B 111
Titanium & Ti AlloysSB 338 / B 338

ASTM A556M-88/ASME SA556 Seamless cold drawn steel feedwater heater tubes

Feedwater Heater Tubes

Standard:ASME SA556 Chemical Compostion

GradeC %Si %Mn %P %S %
B20.27 max0.10 min0.29-0.930.030 max0.030 max
C20.30 max0.10 min0.29-1.060.030 max0.030 max

Mechanical Properties

GradeTensile Strength MPAYield Strength MPAHardness HRB
B2410 min260 min79 min
C2480 min280 min89 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.

U-Bend Fabrication Tolerances

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

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.
ItemCondition (when)Tolercance
 Nominal bend radius ≤ 2 x nominal ODless than or equal to 12%
Ovality2 x nominal OD < Nominal bend radius ≤ 4 x nominal ODless than or equal to 10%
 Nominal bend radius > 4 x nominal OD less than or equal to 5%
 Nominal bend radius ≤ 2 x nominal OD0.75 x nominal wall
Mimimum wall thickness2 x nominal OD < Nominal bend radius ≤ 4 x nominal OD0.8 x nominal wall
 Nominal bend radius > 4 x nominal OD0.9 x nominal wall
 Nominal bend radius ≤ 8″ (200mm)+/-3/64″(1mm)
Bending Radius8″ (200mm) < Nominal bend radius ≤ 16″ (400mm)+/-1/16″(1mm)
 Nominal bend radius >16″ (400mm)+/-5/64″(1mm)
Disrance between legs Max 1/16″(1.5mm)
Wall thinning of bending area Max 17%
Difference between leg lengths at the endsLeg length ≤ 16′ (4.88m)+1/8″(3mm)
Leg length > 16′ (4.88m)+3/16″(5mm)
Deviation from plane of bend ≤ 3/16″(1.5mm)
Flattening on bend ≤ 10% nominal diameter
Straight leg length≤5m+1/8″(3mm)
>5m+3/16(5mm)
Total tube length including radius≤6m+3/16(5mm)
>6m+5/16″(8mm)

Standards usually required to establish U bend tube tolerances:

U bend dimension capablity
Tube OD Tube thickness Bending Radius U tube straight “leg” length Straight tube before U bending
Min. 12,7mm / Max. 31,75mm Min. 0,70mm / Max. 4,19mm Min. 1,5 x OD / Max. 1250mm Max. 12500mm Max. 27000mm

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

Dimensional controls on U bend tube

‘U’ bends are produced, controlled and measured fully in accordance with relevant standards.

  • Hydrostatic Test
  • Air Underwater Test
  • Pulsating Pressure Test
  • Dye Penetrant Test
  • Magnetoscopic test
  • Dye penetrant of ‘U’ bend area
  • PMI testing
  • Heat Treatment

All tubes are cut to the specified leg lenghts, ends deburred and the bores are internally cleaned with dried air.

Heat Treatment

We are equipped to carry out heat treatment of bends plus a minimum 150mm of leg.

Heat Treatment Equipment

  • Heat treatment equipment is computer controlled with the added facility of data recording.
  • An argon protective atmopshere is used inside stainless and special alloy tubes during heat treatment.
  • We can provide all types of annealing; solution annealing and stress relieving.

Usage

All tubes are cut to the specified leg lenghts, ends deburred and the bores are internally cleaned with dried air.

Our U-Bend Manufacturing Center allows us to increase efficiency and reduce lead times, while maintaining the world-class quality for which we are known.

Sunny steel’s tubing and pipe are produced to dimensional tolerances and finish requirements of ASTM and ASME A179, A 249/SA 249, A 688/SA 688, and A 803/SA 803 specifications.

Check to see more information about U-bend pipes :
 
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.
Related products
Stub Ends are f
Pipe Tee is a t
Pipe reducers b
Pipe fittings a
Elbows, also kn