ASTM A249 TP304L Tube (Pipe) Supplier & Exporter in India

ASTM A249 TP304L Tube (Pipe) is a low-carbon welded austenitic stainless steel tube manufactured for boilers, superheaters, heat exchangers, and condensers. TP304L is the low-carbon version of TP304, specifically designed to reduce the risk of intergranular corrosion after welding.

With a maximum carbon content of 0.035%, TP304L minimizes chromium carbide precipitation during welding, improving corrosion resistance in welded structures. Manufactured under ASTM A249 specifications, these tubes are supplied in the welded and heat-treated condition to meet mechanical and metallurgical requirements. Although commonly referred to as “pipe” in trade terminology, ASTM A249 technically covers welded stainless steel tubes.

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 sensitization during welding, making it more suitable for applications involving heavy fabrication and welded joints.

Key Features of ASTM A249 TP304L

• Enhanced Weldability
  Low carbon content minimizes carbide formation at welded joints, improving corrosion resistance in fabricated assemblies.
• Excellent Corrosion Resistance
  Provides strong resistance to atmospheric corrosion, oxidation, and mildly aggressive chemicals in both oxidizing and moderately reducing environments.
• Reliable High Temperature Performance
  Maintains mechanical strength and oxidation resistance in elevated temperature service such as boilers and heat exchanger systems.
• Good Fabrication Properties
  Offers excellent formability and is widely used where extensive welding is required.
• Standard Compliance
  Manufactured in accordance with ASTM A249 requirements for welded austenitic stainless steel boiler and heat exchanger tubes.

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%

Applications of ASTM A249 TP304L Tube

• Boilers & Heat Exchangers
  Suitable for high-temperature fluid handling in thermal processing systems.
• Condenser Systems
  Ensures efficient heat exchange performance even in moderately corrosive environments.
• Oil & Gas Industry
  Preferred where extensive welding is required in corrosive process conditions.
• Petrochemical Plants
  Used in fabricated piping systems handling aggressive fluids and gases.
• Power Generation
  Applied in steam generation and thermal energy systems requiring corrosion resistance.

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