ASTM A179 U Bend Tubes

 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 Diameter	Tube Wall Thickness	Bending Radius	U Tube Straight “Leg” Length	Straight Tube Before U Bending
min. 12,70 mm	min. 0,70 mm	min. 1,5 x D	max. 11 000 mm	max. 24 000 mm
max. 31,75 mm	max 5,16 mm	max. 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 A179

K01200

STBH 340 / STB 35

D3563 / G3461

St 35.4

1629

1.0309

3606

CFS 320

D 37-2

629

(3b)

TU 37 C

A49-215

(3a)

C 14

5462

St 35.8

17175

1.0305

Plus 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