ASME SA249 TP304 Stainless Steel Welded Tube For Heat Exchanger and Condenser
A249 TP304 Welded Tubes refer to a specific type of stainless steel tubing that conforms to the ASTM A249/A249M standard, with the material grade TP304. Here's a detailed breakdown:
1. Chemical Composition of A249 TP304 (%)
The composition must meet the following limits (ASTM A249/A249M):
| Element | Composition Range (%) |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Chromium (Cr) | 18.00 – 20.00 |
| Nickel (Ni) | 8.00 – 11.00 |
| Nitrogen (N) | ≤ 0.10 |
Note:
Low carbon (304L, ≤ 0.03% C) is available for improved weldability and corrosion resistance.
TP304H has higher carbon (0.04–0.10%) for high-temperature strength.
2. Mechanical Properties of A249 TP304
The required mechanical properties per ASTM A249:
| Property | Requirements |
| Tensile Strength (MPa) | ≥ 515 (75 ksi) |
| Yield Strength (0.2% Offset, MPa) | ≥ 205 (30 ksi) |
| Elongation (% in 2 in or 50 mm) | ≥ 35% (for welded tubes) |
| Hardness (Rockwell B) | ≤ 90 HRB (typical annealed condition) |
Notes:
Tensile & Yield Strength: TP304 has good strength at both room and elevated temperatures.
Elongation: High ductility ensures good formability.
Hardness: Annealed condition ensures softness for welding and forming.
3. Additional Properties
- Corrosion Resistance: Excellent resistance to oxidation, acids, and chlorides (except in extreme conditions like high chloride + high temp).
- Weldability: Excellent (TIG, laser, or plasma welding preferred; post-weld annealing may be needed for critical applications).
- Temperature Range:
- Continuous Service: Up to 870°C (1600°F)
- Intermittent Service: Up to 925°C (1700°F)
4. Comparison with Other Grades
| Grade | Carbon (%) | Key Difference |
| TP304 | ≤ 0.08 | Standard grade for general use |
| TP304L | ≤ 0.03 | Better weldability & corrosion resistance |
| TP304H | 0.04–0.10 | Higher creep strength for high temps |
Conclusion
A249 TP304 welded tubes offer:
✔ High corrosion resistance (Cr-Ni content)
✔ Good mechanical strength & ductility
✔ Suitability for high-temperature service
A249 TP304 welded tubes are high-quality, corrosion-resistant stainless steel tubes designed for high-temperature and high-pressure applications, particularly in boilers and heat exchangers. They offer excellent durability, weldability, and resistance to oxidation and corrosion.
ASTM A249 TP304 welded tubes are widely used in industries requiring corrosion resistance, high-temperature strength, and hygienic properties. Here are the key applications:
1. Heat Exchangers & Condensers
Shell & tube heat exchangers (for liquid/liquid or steam/fluid heat transfer)
Condenser tubes in power plants & refrigeration systems
Chemical processing heat exchangers (due to acid & chloride resistance)
Why TP304?
✔ Resists scaling & oxidation at high temps
✔ Handles corrosive fluids (coolants, steam, chemicals)
2. Boiler & Superheater Tubes
High-pressure steam boilers (power generation, industrial plants)
Superheater tubes (exposed to temps up to 870°C/1600°F)
Waste heat recovery systems
Why TP304?
✔ Retains strength at elevated temperatures
✔ Withstands thermal cycling
3. Food, Beverage & Pharmaceutical Industry
Sanitary tubing for milk, beer, juice processing
Biopharmaceutical piping (requires smooth, non-reactive surfaces)
Clean-in-place (CIP) systems
Why TP304?
✔ Easy to clean, FDA-compliant
✔ Resists organic acids (e.g., citric, lactic)
4. Oil, Gas & Petrochemical
Refinery heat exchangers
Offshore platform tubing (resists saltwater corrosion)
Chemical transport pipelines (mild acids, alkalis)
Why TP304?
✔ Good chloride resistance (better than carbon steel)
✔ Durability in harsh environments
5. Automotive & Aerospace
Exhaust gas recirculation (EGR) coolers
Hydraulic & fuel lines
Aircraft fluid systems
Why TP304?
✔ Lightweight yet strong
✔ Fatigue-resistant for vibration-heavy applications
6. General Industrial & Architectural
Hydraulic/pneumatic tubing
Water treatment plants
Decorative handrails & facades (when polished)
Why TP304?
✔ Cost-effective vs. higher alloys (e.g., 316)
✔ Aesthetic appeal (polished/mirror finish)
Key Advantages of A249 TP304 Welded Tubes
✅ Corrosion-resistant (vs. carbon steel)
✅ High-pressure/temperature rated (per ASME Boiler Code)
✅ Easily welded & fabricated (TIG/Laser welded seams)
✅ Hygienic & non-reactive (ideal for food/pharma)
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ASME SA249 TP304 Stainless Steel Welded Tube For Heat Exchanger And Condenser Images
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