SA179
SA-179/SA-179M, a specification for seamless cold drawn low-carbon steel heat exchanger and condenser tubes, covers tubes 1/8 to 3in, inclusive, in ouside diameter.
Heat Treatment
Tubes shall be heat treated after final cold draw pass at temperrature of 1200°F (650℃) or higher.
Surface Condition
This specification has strict requirement on surface condition. Finished tubes shall be free of scale. A slight amount of oxidation will not be considered as scale.
Chemical Composition
The steel shall conform to the following requirements as to chemical composition:
Carbon 0.06-0.18%
Manganese 0.27-0.63%
Phosphorus max 0.035%
Sulfur max 0.035%
Hardness Requirements
The tube shall have a hardness number not exceeding 72 HRB.
Mechanical Test Requirements
Flattening Test, Flaring Test, Flange Test, Hardness Test, Hydrostatic Test
Tensile strength: min 47[325] ksi[MPa]
Yield strength: min 26[180] ksi[MPa]
Elongation in 2in or 50mm: min 35%
Comparison SA179 with 10#
| Chemical Composition | SA179 | 10# |
| Carbon | 0.06-0.18% | 0.07~0.13% |
| Manganese | 0.27-0.63% | 0.35～0.65 |
| Phosphorus | ≤0.035% | ≤0.035% |
| Sulfur | ≤0.035% | ≤0.035% |
| Mechanical Properties | ||
| Tensile strength | ≥325MPa | ≥335MPa |
| Yield strength | ≥180MPa | ≥205MPa |
| Elongation | ≥35% | ≥31% |
