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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 %
Outside Diameter In. (mm)	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)
Outside Diameter 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 11⁄2 to 2 [38.1 to 50.8], Excl	0.008 (0.2)	0.008 (0.2)
2 to 21⁄2 [50.8 to 63.5], Excl	0.010 (0.25)	0.010 (0.25)
21⁄2 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	3⁄16 [5]	0 [0]
Under 2 [50.8]	1⁄8 [3]	0 [0]
2 [50.8] and over	3⁄16 [5]	0 [0]
Under 2 [50.8]	1⁄8 [3]	0 [0]
2 [50.8] and over	3⁄16 [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 1⁄8 in. [3 mm] for each 10 ft [3 m] or fraction thereof over 24 ft or 1⁄2 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 11⁄2 [25.4 to 38.1], excl	1500 [10]
11⁄2 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 follows