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ASTM A179 tubes are made from low-carbon steel, typically with a carbon content of 0.06-0.18%. This low carbon content makes the tubes suitable for bending, flaring, and other forming operations while maintaining good heat transfer properties.
The tubes covered by this specification are typically manufactured using a cold-drawn process, which involves drawing a solid steel billet through a die to reduce its diameter and achieve the desired dimensions and wall thickness. This process results in smooth, clean surfaces and tight tolerances.
Applications: ASTM A179 seamless steel tubes are used in heat exchangers, condensers, and similar heat transfer equipment in various industries, including the power generation, chemical, and manufacturing sectors.
Chemical Composition of ASTM A179,ASME SA179 Seamless Heat-Exchanger and Condenser Tubes
| Material | Chemical Composition(%) | ||||
| C | Si | Mn | P | S | |
| 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
| Grade | ASTM A179 |
| Tensile Strength(MPa) | ≥325 |
| Yield Strength(MPa) | ≥180 |
| Elongation,% | ≥35 |
| Hardness, HRB | ≤72 |
Tolerances of Wall Thickness
| Outside Diameter, in. [mm] |
Wall Thickness, % | |||||||
| 0.095[2.4] and Under | Over 0.095 to 0.150 [2.4 to 3.8], incl |
Over 0.150 to 0.180 [3.8 to 4.6], incl |
Over 0.180,[4.6] | |||||
| Over | Under | Over | Under | Over | Under | Over | Under | |
| Seamless, Cold-Finished Tubes | ||||||||
| Over | Under | |||||||
| 1 1 ⁄ 2 [38.1] and under | 20 | 0 | ||||||
| Over 1 1 ⁄ 2 [38.1] | 22 | 0 | ||||||
Tolerances of Outside Diameter
| 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 1 ⁄ 2 [25.4 to 38.1], incl | 0.006 [0.15] | 0.006 [0.15] |
| Over 1 1 ⁄ 2 to 2 [38.1 to 50.8], excl | 0.008 [0.2] | 0.008 [0.2] |
| 2 to 2 1 ⁄ 2 [50.8 to 63.5], excl | 0.010 [0.25] | 0.010 [0.25] |
| 2 1 ⁄ 2 to 3 [63.5 to 76.2], excl | 0.012 [0.3] | 0.012 [0.3] |
| 3 to 4 [76.2 to 101.6], incl | 0.015 [0.38] | 0.015 [0.38] |
| Over 4 to 7 1 ⁄ 2 [101.6 to 190.5], incl | 0.015 [0.38] | 0.025 [0.64] |
| Over 7 1 ⁄ 2 to 9 [190.5 to 228.6], incl | 0.015 [0.38] | 0.045 [1.14] |
Tolerances of Length
| Method of Manufacture |
Outside Diameter, in. [mm] |
Cut Length,in. [mm] | |
| Over | Under | ||
| Seamless, cold-finished | Under 2 [50.8] | 1 ⁄ 8 [3] | 0 [0] |
| 2 [50.8] and over | 3 ⁄ 16 [5] | 0 [0] | |
| 2 [50.8] and over | 3 ⁄ 16 [5] | 0 [0] | |
