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ASTM A179/ASME SA179 Standard covers minimum-wall thickness, seamless low-carbon cold drawn steel tube for tubular heat exchangers, condensers, and similar heat transfer apparatus.
ASTM A179/ASME SA179 Tubes shall be made by the seamless process and shall be cold drawn. ASTM A179/ASME SA179 Tubes shall be heat treated after the final cold drawn pass at a temperature of 1200°F [650°C] or higher.
ASTM A179/ASME SA179 Tubes should do Product Analysis test, Hardness test, Mechanical Test, Flattening Test, Flaring Test, Hydrostatic Test or NDT Test if agreed by Client.
ASTM A179/ASME SA179 Tube 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/ASME SA179 Tube Mechanical Properties
|
Mechanical Properties |
|||
|
Tensile Strength (Mpa) |
Yield Strength (Mpa) |
Elongation (%) |
Hardness (HRB) |
|
≥325 |
≥180 |
≥35 |
≤72 |
ASTM A179/ASME SA179 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/ASME SA179 Tube Outside Diameter Tolerance
|
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 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/ASME SA179 Tube Cut Length Tolerance
|
Cold-Finished Seamless Steel Tube |
||
|
Outside Diameter ,In. (mm) |
Cut Length ,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. |
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Our factory takes more than 5 suare kilometers, 15 production lines can make different sizes cold rolled or cold drawn seamless pipe.
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