ASTM A269 TP304 Stainless Steel Heat Exchanger Tube , Chemical Industry

ASTM A269: This is the standard specification for Seamless and Welded Austenitic Stainless Steel Tubes for general service. ASTM A269 covers the requirements for the chemical composition, mechanical properties, tolerances, and testing methods for stainless steel tubes used in general corrosion-resistant applications.

TP304 stainless steel has good weldability, allowing it to be used in welded applications without compromising its mechanical properties. It is commonly used in welded tube applications where strength and durability are essential.

Chemical Composition:

• Chromium (Cr): 18.0–20.0%
• Nickel (Ni): 8.0–10.5%
• Carbon (C): ≤0.08%
• Manganese (Mn): ≤2.0%
• Silicon (Si): ≤1.0%
• Phosphorus (P): ≤0.045%
• Sulfur (S): ≤0.03%
• Nitrogen (N): ≤0.10%

Mechanical Properties:

• Tensile Strength: ≥515 MPa (75 ksi)

• Yield Strength (0.2% offset): ≥205 MPa (30 ksi)

• Elongation: ≥35% in 50 mm (2 in.) gauge length.

• Hardness: ≤90 HRB (Rockwell B).

Corrosion and Thermal Properties:

• Oxidation Resistance: Suitable for continuous service up to 870°C (1600°F) and intermittent up to 925°C (1700°F).

• Thermal Conductivity: ~16.2 W/m·K at 100°C, lower than copper but sufficient for many thermal applications.

• Compatibility: Resists organic acids, nitric acid, and aqueous alkalies; avoid prolonged exposure to chlorides.

Applications:

1. Chemical and Pharmaceutical Industry

- Chemical Containers: Used in chemical containers, transport tanks, and heat exchangers due to its resistance to various chemicals.

- Pharmaceutical Equipment: Employed in pharmaceutical production equipment and clean rooms for its non-reactive and easy-to-clean properties.

2.Pharmaceutical and Biotechnology:

- Heat Exchangers in Pharmaceutical Manufacturing: TP304 stainless steel tubes are used in pharmaceutical manufacturing equipment, such as cooling and heating systems. The material's resistance to contamination and ease of cleaning make it ideal for maintaining sanitary conditions.

- Biotechnology: In biotech processes, where temperature control is essential, TP304 tubes are used in fermentation cooling systems, cell culture processes, and other applications that require thermal stability.

3.HVAC (Heating, Ventilation, and Air Conditioning):

- Chillers and Air Conditioners: TP304 stainless steel tubes are commonly used in chillers and air conditioning systems as part of the heat exchangers. Its resistance to moisture and corrosion helps extend the life of these systems, even in demanding environments.

- Industrial and Commercial HVAC: TP304 tubes are used in various HVAC systems that require heat transfer, such as water-cooled condensers, evaporators, and air handlers.