ASTM A270 TP304L Tube (Pipe) Supplier & Exporter in India

ASTM A270 TP304L Tube (Pipe) is a low-carbon austenitic stainless steel sanitary tubing designed for hygienic applications requiring high corrosion resistance and excellent weldability. TP304L contains a maximum of 0.035% carbon, which reduces the risk of sensitization and intergranular corrosion after welding.

Manufactured in accordance with ASTM A270 specifications, TP304L tubing is supplied in seamless or welded form with polished internal and external finishes suitable for sanitary service. The reduced carbon content allows welded structures to maintain corrosion resistance in the heat-affected zone, making it ideal for food, dairy, beverage, and pharmaceutical industries. Although commonly referred to as “pipe,” ASTM A270 technically covers sanitary 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 minimizes carbide precipitation during welding, ensuring improved corrosion resistance in fabricated sanitary systems.

Key Features of ASTM A270 TP304L

• Low Carbon Composition
  Reduces the risk of intergranular corrosion and improves long-term durability in welded assemblies.
• Enhanced Weldability
  Maintains corrosion resistance in heat-affected zones without the need for post-weld heat treatment in most cases.
• Excellent Corrosion Resistance
  Suitable for sanitary environments exposed to cleaning agents and mild processing chemicals.
• Sanitary Surface Finish
  Available in polished finishes such as 180 grit, 320 grit, and higher finishes to meet hygienic industry standards.
• ASTM A270 Compliance
  Produced according to ASTM A270 requirements for seamless and welded austenitic stainless steel sanitary 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 A270 TP304L Tube

• Food Processing Industry
  Used in hygienic piping systems for contamination-free product handling.
• Dairy & Beverage Plants
  Suitable for systems requiring frequent cleaning and sterilization.
• Pharmaceutical Manufacturing
  Applied in high-purity process lines and sanitary equipment.
• Storage Tanks & Processing Equipment
  Ideal for fabricated systems requiring extensive welding and hygienic performance.

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