What is SA179 Tube?
ASME SA179 (identical to ASTM A179) covers seamless cold-drawn low-carbon steel tubes for tubular heat exchangers, condensers and similar heat transfer equipment. Thermal efficiency matters the most in these applications. The low carbon content helps heat move through the metal fast. During the cold-drawing process, the internal and external surfaces become very smooth. This prevents fouling. It also improves the flow of fluid. These tubes work best with clean fluids at moderate temperatures.
This specification requires every tube to pass a hydrostatic test. We also perform flattening and flaring tests. Our team inspects every piece for dimensional accuracy and surface quality before shipment.
ASME SA179 Tube Specifications
These specifications define the requirements for seamless cold-drawn tubes used in heat transfer applications.
| Standard | ASTM A179 / ASME SA179 |
|---|---|
| OD Range | 1/8" to 3" (3.2mm to 76.2mm) |
| Wall Thickness | BWG (Birmingham Wire Gauge) |
| Length | Fixed or random lengths |
| Manufacture | Seamless, Cold-Drawn |
| Finish | Bright Annealed or Black |
Chemical Composition of ASME SA179 Tubes
The chemical composition of ASME SA179 tube ensures it is strong enough for heat exchanger service while ensuring optimal heat transfer.
| Element | % |
|---|---|
| Carbon (C) | 0.06 - 0.18% |
| Manganese (Mn) | 0.27 - 0.63% |
| Phosphorus (P) | 0.035% max |
| Sulphur (S) | 0.035% max |
Mechanical Properties of ASME SA179 Tubes
SA179 Tubes must meet certain mechanical properties to work well in heat transfer applications.
| Property | Value |
|---|---|
| Tensile Strength | 325 MPa minimum |
| Yield Strength | 180 MPa minimum |
| Elongation | 35% minimum in 2 inches |
| Hardness | 72 HRB maximum |
Outside Diameter Tolerance
The varying outside diameter changes the tolerances. Smaller tubes need stricter limits. This is very important for building precise heat exchangers.
Cut Length Tolerance
We cut these tubes to specific lengths so they fit perfectly during assembly. Standard tolerances are used unless closer tolerances are specified. For complete cut length tolerance data, refer to the table below.
Hydrostatic Test Pressures
Each SA179 tube undergoes hydrostatic testing to verify leak-free construction. We calculate the test pressure based on the tube dimensions and the wall thickness. Refer to the table below for complete hydrostatic test pressure requirements.
Applications
SA179 tubes are mainly used in the following 2 applications where you need clean surfaces and high thermal conductivity.