SA179 seamless heat exchange steel pipe is a special steel pipe widely used in heat exchangers, condensers and other high-pressure equipment. Its excellent thermal conductivity, corrosion resistance and stability under high temperature and high pressure environments make it a core material in industrial fields such as petrochemical, power, and boiler manufacturing.
SA179 seamless steel pipe chemical composition
| Standard | C | Si | Mn | P | S | Cr | Mo | Cu | Ni | V |
|---|---|---|---|---|---|---|---|---|---|---|
| ASME SA179 | 0.06–0.18 | / | 0.27–0.63 | ≤0.035 | ≤0.035 | / | / | / | / | / |
ASME SA179 Mechanical Properties Comparison Table
| Standard | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| ASME SA179 | ≥325 | ≥180 | ≥35 |
Size Specifications:
Applicable to steel pipes with outer diameters ranging from 1/8 inch to 3 inches (i.e., 3.2 to 76.2 mm). Smaller outer diameters and thinner walls are also available, but the mechanical properties required do not apply to pipes with an outer diameter less than 1/8 inch (3.2 mm) or a wall thickness less than 0.015 inch (0.4 mm).
Heat Treatment:
The steel pipes must undergo heat treatment at 1200 degrees Fahrenheit (i.e., 650 degrees Celsius) or higher after the final cold drawing process to relieve internal stress and improve the material's toughness and corrosion resistance.
Features:
1. Thermal Conductivity: Thermal conductivity reaches 45-50 W/(m·K), far exceeding that of ordinary carbon steel pipes, making it particularly suitable for heat exchange applications.
2. Mechanical Strength: Tensile strength ≥325MPa, yield strength ≥180MPa, maintaining structural stability even under high-temperature conditions.
3. Dimensional Accuracy: Outer diameter tolerance controlled within ±0.10mm, wall thickness deviation not exceeding ±10%, ensuring equipment assembly sealing.
4. Surface Quality: After pickling and phosphating treatment, surface roughness Ra≤0.8μm, effectively reducing fluid resistance.