The ASTM A179 specification applies to seamless cold-drawn low-carbon steel tubes intended for use in tubular heat exchangers, condensers, and similar heat transfer equipment.
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Dimensional Scope of ASTM A179 Seamless Steel Pipe
This standard covers tubes with an outside diameter (OD) ranging from 1/8 inch to 3 inches (3.2 mm to 76.2 mm).
Tubes with diameters and wall thicknesses smaller than the specified limits may also be manufactured under this standard; however, mechanical property requirements do not apply to tubes with:
OD smaller than 1/8 inch (3.2 mm)
Wall thickness less than 0.015 inch (0.4 mm)
ASTM A179 Seamless Steel Pipe Chemical Compositions
|
Chemical Components (%)
|
|
C
|
Si
|
Mn
|
P
|
S
|
Mo
|
Cr
|
V
|
|
0.06-0.18
|
/
|
0.27-0.63
|
≤0.035
|
≤0.035
|
/
|
/
|
/
|
ASTM A179 Seamless Steel Pipe Mechanical Properties
|
Mechanical Properties
|
|
Tensile
Strength (Mpa)
|
Yield
Strength (Mpa)
|
Elongation
(%)
|
Hardness
(HRB)
|
|
≥325
|
≥180
|
≥35
|
≤72
|
A179 Heat Exchanger Tube Outside Diameter Dimension And Tolerance
|
Outside Diameter, mm
|
Tolerance, mm
|
|
3.2≤OD＜25.4
|
±0.10
|
|
25.4≤OD≤38.1
|
±0.15
|
|
38.1＜OD＜50.8
|
±0.20
|
|
50.8≤OD＜63.5
|
±0.25
|
|
63.5≤OD＜76.2
|
±0.30
|
|
76.2
|
±0.38
|
ASTM A179 Seamless Tube Wall Thickness Tolerance
|
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 Heat Exchanger Tube Hardness
|
Tensile strength
|
Yield strength
|
Elongation
|
Flattening Test
|
Flaring Test
|
Flange Test
|
|
min
|
min
|
in 2 in. or 50 mm, min
|
|
47 ksi
[325 MPa]
|
26 ksi
[180 MPa]
|
35%
|
See ASTM A450, Section 19
|
See ASTM A450, Section 21
|
See ASTM A450, Section 22
|
Referenced Test Methods of ASTM A179 Seamless Steel Pipe
The following test methods are applicable under the ASTM A179 specification:
Hardness Test
Flattening Test
Flaring Test
Flange Test
Hydrostatic Test – Each tube must undergo a hydrostatic test or, alternatively, a nondestructive electric test as a substitute.
Marking Requirements of ASTM A179 Seamless Steel Pipe
Tubes manufactured under ASTM A179 / ASME SA179 shall be marked in accordance with the requirements specified in ASTM A450. The markings must include the product identification and the order number.
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