Products 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
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ASTM A179/A179M Chemical Components (%) |
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C |
Si |
Mn |
P |
S |
Mo |
Cr |
V |
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0.06-0.18 |
/ |
0.27-0.63 |
≤0.035 |
≤0.035 |
/ |
/ |
/ |
ASTM A179/A179M U-bent tube Mechanical Properties
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ASTM A179/A179M Mechanical properties |
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Tensile |
Yield |
Elongation |
Hardness |
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≥325 |
≥180 |
≥35 |
≤72 |
ASTM A179/A179M U-bent tube Wall Thickness Tolerance
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ASTM A179/A179M Seamless, Cold-Finished Tubes |
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Outside Diameter |
Wall thickness Tolerance % |
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Over (+) |
Under (-) |
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1 ½ (38.1) |
20 |
0 |
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Over 1½ (38.1) |
22 |
0 |
ASTM A179/A179M U-bent tube Outside Diameter Tolerance
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ASTM A179/A179M Cold-Finished Seamless Tubes |
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Outside Diameter |
Permissible Variations In. (mm) |
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Over (+) |
Under (-) |
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Under 1 (25.4) |
0.004 (0.1) |
0.004 (0.1) |
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1 to 1 ½ (25.4 to 38.1), Incl |
0.006 (0.15) |
0.006 (0.15) |
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Over 11⁄2 to 2 [38.1 to 50.8], Excl |
0.008 (0.2) |
0.008 (0.2) |
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2 to 21⁄2 [50.8 to 63.5], Excl |
0.010 (0.25) |
0.010 (0.25) |
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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
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ASTM A179/A179M Cold-Finished Seamless Tubes |
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Outside Diameter |
Cut Length, in.(mm) |
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In.(mm) |
Over (+) |
Under (-) |
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All Sizes |
3⁄16 [5] |
0 [0] |
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Under 2 [50.8] |
1⁄8 [3] |
0 [0] |
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2 [50.8] and over |
3⁄16 [5] |
0 [0] |
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Under 2 [50.8] |
1⁄8 [3] |
0 [0] |
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2 [50.8] and over |
3⁄16 [5] |
0 [0] |
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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. |
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ASTM A179/A179M U-bent tube Hydrostatic Test Pressures
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ASTM A179/A179M Hydrostatic Test Pressures |
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Outside Diameter of Tube, in. [mm] |
Hydrostatic Test Pressure, psi [Mpa] |
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Under 1 [25.4] |
1000 [7] |
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1 to 11⁄2 [25.4 to 38.1], excl |
1500 [10] |
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11⁄2 to 2 [38.1 to 50.8], excl |
2000 [14] |
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2 to 3 [50.8 to 76.2], excl |
2500 [17] |
ASTM A179/A179M U-bent tube sizes (u-bending, u-bend)
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Tube Outside Diameter |
Tube Wall Thickness |
Bending Radius |
U Tube Straight “Leg” Length |
Straight Tube Before U Bending |
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min. 12,70 mm |
min. 0,70 mm |
min. 1,5 x D |
max. 11 000 mm |
max. 24 000 mm |
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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
•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.