ASTM A179 Boiler Tube
ASTM A179, ASME SA179 steel tubes covers minimum-wall-thickness, seamless cold-drawn low-carbon steel tubes for tubular heat exchangers, condensers, and similar heat transfer apparatus.
ASTM A179, ASME SA179 covers tubes 1/8 to 3 in. [3.2 to 76.2 mm], inclusive, in outside diameter.
ASTM A179,ASME SA179 Seamless Tube Specification:
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OD (mm) |
Wall Thickness(mm) |
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2 |
2.5 |
3 |
3.5 |
4 |
4.5 |
5 |
6 |
6.5-7 |
7.5-8 |
8.5-9 |
9.5-10 |
11 |
12 |
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Φ25-Φ28 |
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Φ32 |
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Φ34-Φ36 |
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Φ38 |
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Φ40 |
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Φ42 |
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Φ45 |
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Φ48-Φ60 |
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Φ63.5 |
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Φ68-Φ73 |
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Φ76 |
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Manufacture
ASTM A179,ASME SA179 steel tubes are made by the seamless process and shall be cold drawn.
Heat Treatment of ASTM A179,ASME SA179
ASTM A179,ASME SA179 steel tubes are heat treated after the final cold draw pass at a temperature of 1200°F [650°C] or higher.
Chemical Composition of ASTM A179,ASME SA179 Seamless Heat-Exchanger and Condenser Tubes
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Material |
Chemical Composition(%) |
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C |
Si |
Mn |
P |
S |
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ASTM A179 |
0.06-0.18 |
≤ 0.25 |
0.27-0.63 |
≤0.035 |
≤0.035 |
Mechanical Propertie of ASTM A179,ASME SA179 Seamless Heat-Exchanger and Condenser Tubes
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Grade |
ASTM A179 |
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Tensile Strength(MPa) |
≥325 |
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Yield Strength(MPa) |
≥180 |
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Elongation,% |
≥35 |
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Hardness, HRB |
≤72 |
Note —Tubing smaller in outside diameter and having a thinner wall than indicated in this specification is available. Mechanical property requirements do not apply to tubing smaller than 1/8 in. [3.2 mm] in outside diameter or with a wall thickness under 0.015 in. [0.4 mm].
The dimensional tolerances of ASTM A179,ASME SA179 Seamless Heat-Exchanger and Condenser Tubes
Tolerances of Wall Thickness
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Outside |
Wall Thickness, % |
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0.095[2.4] and Under |
Over 0.095 to 0.150 |
Over 0.150 to 0.180 |
Over 0.180,[4.6] |
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Over |
Under |
Over |
Under |
Over |
Under |
Over |
Under |
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Seamless, Cold-Finished Tubes |
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Over |
Under |
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1 1 ⁄ 2 [38.1] and under |
20 |
0 |
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Over 1 1 ⁄ 2 [38.1] |
22 |
0 |
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Tolerances of Outside Diameter
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Outside Diameter,in. [mm] |
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 1 ⁄ 2 [25.4 to 38.1], incl |
0.006 [0.15] |
0.006 [0.15] |
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Over 1 1 ⁄ 2 to 2 [38.1 to 50.8], excl |
0.008 [0.2] |
0.008 [0.2] |
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2 to 2 1 ⁄ 2 [50.8 to 63.5], excl |
0.010 [0.25] |
0.010 [0.25] |
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2 1 ⁄ 2 to 3 [63.5 to 76.2], excl |
0.012 [0.3] |
0.012 [0.3] |
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3 to 4 [76.2 to 101.6], incl |
0.015 [0.38] |
0.015 [0.38] |
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Over 4 to 7 1 ⁄ 2 [101.6 to 190.5], incl |
0.015 [0.38] |
0.025 [0.64] |
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Over 7 1 ⁄ 2 to 9 [190.5 to 228.6], incl |
0.015 [0.38] |
0.045 [1.14] |
Tolerances of Length
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Method of |
Outside |
Cut Length,in. [mm] |
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Over |
Under |
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Seamless, cold-finished |
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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2 [50.8] and over |
3 ⁄ 16 [5] |
0 [0] |
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Mechanical Tests Required
(1)Flattening Test—One flattening test shall be made on specimens from each of two tubes from each lot or fraction thereof.
(2)Flaring Test—One flaring test shall be made on speci- mens from each of two tubes from each lot or fraction thereof.
(3) Flange Test—When specified as a substitute for the flaring test, for tubes having a wall thickness (actual mean wall) less than 10 % of the outside diameter, one test shall be made on specimens from each of two tubes
(4)Hardness Test—Rockwell hardness tests shall be made on specimens from two tubes from each lot.
(5) Hydrostatic Test—Each tube shall be subjected to the hydrostatic test, or a nondestructive electric test
Surface Condition
Finished tubes shall be free of scale. A slight amount of oxidation will not be considered as scale.
Product Marking
In addition to the marking prescribed in Specification A450/A450M, the marking shall include the name and order number of the purchaser.
Note: Material furnished under ASTM A179,ASME SA179 conform to the applicable requirements of the current edition of Specification A450/A450M
Application:
ASTM A179,ASME SA179 seamless cold-drawn low-carbon steel tubes for tubular heat exchangers, condensers, and similar heat transfer apparatus.