In terms of chemical composition, ASTM A179 strictly controls the carbon content within the range of 0.06% - 0.18%, the manganese content within 0.27% - 0.63%, and the sulfur and phosphorus impurity content is ≤0.035%. This ensures the purity of the material, endowing it with good ductility and weldability.
The mechanical properties of this kind of steel pipe are also remarkable. Its tensile strength is ≥325MPa, yield strength is ≥180MPa, elongation is ≥35%, and hardness is ≤72HRB. It can work stably in the temperature range of - 50℃ to 450℃, especially suitable for high - temperature and high - pressure steam systems.
ASTM A179 Carbon Steel Pipe is formed by cold - drawing process. Its pipe diameter ranges from 3.2mm to 76.2mm, and the wall - thickness accuracy can reach ±0.1mm. The inner and outer walls have no oxide layer, with a high - smooth surface. It can bear high pressure without leakage, and will not be deformed during cold bending, and there will be no cracks during flaring and flattening, meeting the needs of high - precision equipment manufacturing. After the last cold - drawing, the steel pipe needs to be heat - treated at a temperature above 650℃ to eliminate processing stress and optimize the metallographic structure (ferrite - pearlite).
In the production process, it is necessary to pass a series of tests, such as flattening test, flaring test, hydrostatic test, etc., to ensure that each steel pipe meets the standard requirements.
This kind of steel pipe is the first - choice material in many industries, such as boiler, chemical industry, petroleum and natural gas. In the boiler system, its high - temperature and high - pressure resistance can ensure the heat - exchange efficiency. In the chemical industry, its good corrosion resistance is suitable for transporting acid, alkali and other media. In oil and gas transportation, its high - tightness can reduce the leakage risk. In addition, it can also be used to manufacture mechanical parts such as hydraulic cylinder pipes and bearing sleeves, showing good adaptability in multiple scenarios.
