ASTM A269 TP304L Tube (Pipe) Supplier & Exporter in India

ASTM A269 TP304L Tube (Pipe) is a low-carbon austenitic stainless steel seamless or welded tubing designed for general corrosion-resisting and low- to high-temperature service applications. TP304L is the low-carbon version of TP304, containing a maximum of 0.035% carbon to reduce the risk of sensitization during welding.

Manufactured in accordance with ASTM A269 specifications, TP304L tubing is supplied in the annealed condition and is widely used in instrumentation, process piping, and hygienic applications. The reduced carbon content minimizes chromium carbide precipitation in the heat-affected zone, thereby improving resistance to intergranular corrosion in welded structures. Although commonly referred to as “pipe,” ASTM A269 technically covers stainless steel tubing.

Difference Between TP304 and TP304L

• TP304 Carbon Content: Maximum 0.08%
• TP304L Carbon Content: Maximum 0.035%

The lower carbon content in TP304L significantly reduces carbide precipitation during welding, improving long-term corrosion resistance in fabricated and welded assemblies.

Key Features of ASTM A269 TP304L

• Low Carbon Content
  Minimizes intergranular corrosion by preventing chromium carbide formation during welding.
• Enhanced Weldability
  Suitable for extensive welding operations without the need for post-weld heat treatment in most applications.
• Excellent Corrosion Resistance
  Provides reliable resistance to atmospheric and moderately corrosive chemical environments.
• Good Mechanical Strength
  Maintains adequate tensile and yield strength for structural and process applications.
• ASTM A269 Compliance
  Manufactured in accordance with ASTM A269 requirements for seamless and welded austenitic stainless steel tubing.

Chemical Composition

• Carbon (C): ≤ 0.035%
• Manganese (Mn): ≤ 2.00%
• Phosphorus (P): ≤ 0.045%
• Sulfur (S): ≤ 0.030%
• Silicon (Si): ≤ 1.00%
• Chromium (Cr): 18.0 – 20.0%
• Nickel (Ni): 8.0 – 12.0%
• Iron (Fe): Balance

Mechanical Properties (Annealed Condition – Minimum)

• Tensile Strength: ≥ 485 MPa
• Yield Strength (0.2% Proof): ≥ 170 MPa
• Elongation: ≥ 35%
• Hardness: ≤ 90 HRB (Rockwell B)

Applications of ASTM A269 TP304L Tube

• Pharmaceutical Industry
  Used in hygienic piping systems requiring corrosion resistance and excellent weldability.
• Dairy & Food Processing
  Ideal for equipment and piping systems requiring frequent cleaning and sanitation.
• Breweries & Beverage Plants
  Resistant to organic acids and suitable for welded processing systems.
• Heat Exchangers
  Appropriate for applications involving fabrication and welding during installation and maintenance.
• Instrumentation & Process Lines
  Suitable for low-pressure and general service stainless steel tubing systems.

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