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ASTM A179 U-bent tube/ASME SA179 U-bent tube

ASTM A179/A179M is Standard Specification for Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes. ASTM A179/A179M can be U bent as per ASTM A556/A556M and DIN 28179.

Description

ASTM A179/A179M is Standard Specification for Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes. ASTM A179/A179M covers minimum-wall-thickness, seamless cold-drawn low-carbon steel tubes for tubular heat exchangers, condensers, and similar heat transfer apparatus. ASTM A179/A179M covers tubes1 ⁄ 8to 3 in. [3.2 to 76.2mm], inclusive, in outside diameter.

ASTM A179/A179M U-bent tube Chemical Compositions

ASTM A179/A179M Chemical Components (%)

C

Si

Mn

P

S

Mo

Cr

V

0.06-0.18

/

0.27-0.63

≤0.035

≤0.035

/

/

/

ASTM A179/A179M U-bent tube Mechanical Properties

ASTM A179/A179M Mechanical properties

Tensile
Strength (Mpa)

Yield
Strength (Mpa)

Elongation
(%)

Hardness
(HRB)

≥325

≥180

≥35

≤72

ASTM A179/A179M U-bent tube Wall Thickness Tolerance

ASTM A179/A179M Seamless, Cold-Finished Tubes

Outside Diameter
In. (mm)

Wall thickness Tolerance %

Over (+)

Under (-)

1 ½ (38.1)
and under

20

0

Over 1½ (38.1)

22

0

ASTM A179/A179M U-bent tube Outside Diameter Tolerance

ASTM A179/A179M Cold-Finished Seamless Tubes

Outside Diameter
In. (mm)

Permissible Variations In. (mm)

Over (+)

Under (-)

Under 1 (25.4)

0.004 (0.1)

0.004 (0.1)

1 to 1 ½ (25.4 to 38.1), Incl

0.006 (0.15)

0.006 (0.15)

Over 112 to 2 [38.1 to 50.8], Excl

0.008 (0.2)

0.008 (0.2)

2 to 212 [50.8 to 63.5], Excl

0.010 (0.25)

0.010 (0.25)

212 to 3 [63.5 to 76.2], Excl

0.012 (0.3)

0.012 (0.3)

ASTM A179/A179M U-bent tube Cut Length Tolerance

ASTM A179/A179M Cold-Finished Seamless Tubes

Outside Diameter

Cut Length, in.(mm)

In.(mm)

Over (+)

Under (-)

All Sizes

316 [5]

0 [0]

Under 2 [50.8]

18 [3]

0 [0]

2 [50.8] and over

316 [5]

0 [0]

Under 2 [50.8]

18 [3]

0 [0]

2 [50.8] and over

316 [5]

0 [0]

These permissible variations in length apply to tubes before bending. They apply to cut lengths up to and including 24 ft [7.3 m]. For lengths greater than 24 ft [7.3 m], the above over-tolerances shall be increased by 18 in. [3 mm] for each 10 ft [3 m] or fraction thereof over 24 ft or 12 in. [13 mm], whichever is the lesser.

ASTM A179/A179M U-bent tube Hydrostatic Test Pressures

ASTM A179/A179M Hydrostatic Test Pressures

Outside Diameter of Tube, in. [mm]

Hydrostatic Test Pressure, psi [Mpa]

Under 1 [25.4]

1000 [7]

1 to 112 [25.4 to 38.1], excl

1500 [10]

112 to 2 [38.1 to 50.8], excl

2000 [14]

2 to 3 [50.8 to 76.2], excl

2500 [17]

ASTM A179/A179M 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

   

ASTM A179/A179M U-Bending tubes are widely used in Heat-exchangers.

ASTM A179/A179M U-bent 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. Sizes tolerances of U bend tubes are to fullfil the requirements of: ASTM A556 /A556M and DIN 28179

ASTM A179/A179M U-bent tube heat treatment

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.

ASTM A179/A179M U-bent tube test as followsA179M U-bent tube

•Hydrostatic Test

•Air Underwater Test

•Pulsating Pressure Test

•Dye Penetrant Test

•Magnetooptical Test

ASTM A179/A179M U-bent tube bending Type:

Cold Bending and Hot Bending.

ASTM A179/A179M U-bent tube Heat Treatment:

After Cold Bending, the bending area needs heat treatment.

ASTM A179/A179M U-bent tube

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