November 27, 2023
ASME SA179 specifies material requirements for seamless heat exchanger piping. Typically, these pipes are made from low-carbon steel to ensure good thermal conductivity and corrosion resistance.
ASME SA179 pipe is commonly used in heat exchanger and boiler systems that are used to heat or cool fluids such as water, steam, oil, and other liquids. Such pipes are used in these applications to transfer heat for temperature regulation and energy transfer.
ASME SA179 seamless pipe has high thermal conductivity and is suitable for heat exchange under high temperature and high pressure conditions. They usually have thinner wall thickness to facilitate heat transfer.
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 |
The dimensional tolerances of ASTM A179,ASME SA179 Seamless Heat-Exchanger and Condenser Tubes
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] |
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