SA179 seamless steel pipe, a carbon steel pipe under the ASME SA179 standard (corresponding to GB/T 8163-2018 10# steel pipe), boasts a low carbon content of 0.06-0.18% and a pure composition of ≤0.035% sulfur and phosphorus, while also possessing a tensile strength of 280-450MPa and an elongation of ≥35%. Its uniform ferrite-pearlite microstructure is obtained through a strictly controlled cold rolling process, making it particularly suitable for the manufacture of heat exchangers and condensing equipment.
Key Characteristics:
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 the airtightness of equipment assembly.
4. Surface Quality: After pickling and phosphating, the surface roughness Ra ≤ 0.8μm, effectively reducing fluid resistance.
SA179 Steel Pipe Core Specifications and Supply Forms Basic Physical Specifications
- Outer diameter range: Φ6-102mm, wall thickness: 0.5-12.7mm (tolerance ±10%)
- Maximum single length: 22 meters, available in annealed/bright finish
- Key Performance Indicators
- Hardness ≤72HRB, Thermal conductivity: 49W/(m·K)
- Hydrostatic test pressure ≥5MPa (standard test conditions)
- Special Processing Characteristics
- Expansion rate ≥15% with no cracks (outer diameter expansion)
- Recommended welding wire: ER70S-6, heat input ≤25kJ/cm²
Applications
1. Power Plant Boiler Systems: As a core material for economizer tube bundles, a single 1000MW ultra-supercritical unit uses 380 tons. Its resistance to coal ash corrosion allows the tube wall thinning rate to be controlled below 0.03mm/year.
2. Oil Refining Units: In the atmospheric and vacuum distillation unit's atmospheric top condenser, SA179 tube bundles can withstand H2S corrosion from sulfur-containing crude oil. Operational data from a Sinopec project shows that its service life is 2.3 times longer than that of 304 stainless steel.
3. Refrigeration Equipment: Evaporator tubes manufactured with φ19×1.25mm specifications achieve a heat transfer coefficient of up to 2800W/(㎡·K), improving the unit's energy efficiency ratio by 15%.
4. Marine Propulsion: Particularly suitable for seawater cooling systems. After using this material, a certain type of LNG ship saw a 12-ton weight reduction in its piping system.