ASTM A179 U Bend Tubes

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 We bend ASTM A179 U Bend Tubes with round, rectangular, square, plus oval cross sections used in medical, automotive, plus electronics industries.


ASTM A179 U-Bending tubes are widely used in Heat-exchangers.


ASTM A179 U Bend Tubes for heat exchangers applied mostly in oil and gas plants, chemical and petrochemical plants, refineries, power plants and renewable energy plants. Low fin tubes can be supplied in the form of U bends.

U-bent tube sizes (u-bending, u-bend)

Tube Outside DiameterTube Wall ThicknessBending RadiusU Tube Straight “Leg” LengthStraight Tube Before U Bending
min. 12,70 mmmin. 0,70 mmmin. 1,5 x Dmax. 11 000 mmmax. 24 000 mm
max. 31,75 mmmax 5,16 mmmax. 1 250 mm

Sizes tolerances of U bend tubes are to fullfil the requirements of: ASTM A556 / 556M and DIN 28179

Heat treatment of U bent tubes

Post bending heat treatment by electrical resistance (Joule effect) is applied. The temperature is monitored and controlled during the process. It is possible to perform the heat treatment in a nitrogen atmosphere.

U bent tubes can be tested as follows

All materials are hydro-tested as standard. Stress relieving is carried out in a gas-fired furnace or solution annealed using an induction heat process. We can offer a range of additional testing on request, including dye penetrant and PMI testing.


  • Hydrostatic Test
  • Air Underwater Test
  • Pulsating Pressure Test
  • Dye Penetrant Test
  • Magnetooptical Test

Bending Type:

Cold Bending and Hot Bending.

Heat Treatment:

After Cold Bending, the bending area needs heat treatment.







Material Comparison Tables (ASTM ℃KS, JIS, DIN, BS, NBN, NF, UNI)

A 179 Seamless Cold Drawn Low-C Steel Heat Exchanger and Conderser Tubes
ASTM
UNS NO.
KOREA/JAPANES

GERMAN

BRITISH
BELGIAN
FRENCH
ITALIAN
KS/JIS Symbol
KS/JIS Numbe
Re
DIN Type

DIN

Materiral
Number

Re

B.S

B.S Grade
Re
NBN Type
NBN Grade
Re
AF
NF
Re
UNI Type
UNI
Re
ASTM A179K01200STBH 340 / STB 35D3563 / G3461St 35.41629

1.0309

 3606CFS 320 D 37-2629(3b)TU 37 CA49-215(3a)C 145462
    St 35.8171751.0305Plus
DIN 2391 Gutegard C.NBK		      

Usage

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










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