ASTM A213 T11 Alloy Steel Heat Exchanger Tube For Tube Bundle

ASTM A213 T11 tubes are made from a ferritic alloy steel, primarily composed of 1% Molybdenum (Mo), with the balance being carbon, manganese, silicon, phosphorus, sulfur, and small amounts of chromium and other elements. The presence of molybdenum enhances the steel’s strength, toughness, and resistance to corrosion at elevated temperatures.

The "T11" grade refers to a specific type of chrome-molybdenum (Cr-Mo) steel. This material is designed to withstand high temperature and pressure conditions, making it ideal for heat transfer applications in power plants, refineries, and chemical plants.

Material Composition:

• Main Alloying Elements:

  • Chromium (Cr): 1.00 - 1.50%
  • Molybdenum (Mo): 0.44 - 0.65%
  • Carbon (C): 0.05 - 0.15%
  • Manganese (Mn): 0.30 - 0.60%
  • Silicon (Si): 0.50 - 0.80%
  • Phosphorus (P) & Sulfur (S): Limits set by the specification to ensure high strength and durability.

Mechanical Properties:

• Tensile Strength: Minimum of 415 MPa (60 ksi)
• Yield Strength: Minimum of 205 MPa (30 ksi)
• Elongation: 30% (in 8 inches) or 35% (in 2 inches)
• These properties ensure that the tube can withstand high operating pressures and temperatures typically encountered in power plant boilers or heat exchangers.

Temperature Resistance:

• Operating Temperature Range: Up to 550°C (1022°F)

• High-Temperature Applications: T11 alloy steel is known for its excellent heat resistance and is used in applications where the tube is exposed to high-pressure steam or gas for extended periods.

Key Characteristics:

• Seamless Construction: ASTM A213 T11 tubes are seamless, which means they are produced without a welded seam, enhancing their strength and pressure-handling capacity.

• Creep and Stress Rupture Resistance: The T11 alloy provides good creep resistance at high temperatures, making it suitable for power generation applications where the tube material must resist deformation under stress over long periods.

• Corrosion Resistance: It exhibits good resistance to oxidizing environments, especially at high temperatures, though it may require additional protective coatings depending on the specific operating environment.

• Fabricability: The material can be easily formed, welded, and machined into the desired shapes and sizes for specific heat exchanger or boiler applications.

Applications:

1. Heat Exchangers: T11 tubes are extensively used in heat exchangers where high thermal conductivity and resistance to pressure and temperature fluctuations are essential.
2. Superheaters: Due to its resistance to both thermal and mechanical stresses, T11 is used in superheating sections of steam boilers.
3. Boilers: Commonly used in the manufacture of tubes for boiler tubes, particularly in power plants and industrial boilers, where they carry high-temperature steam or fluid.
4. Chemical Processing: Often found in applications requiring high-temperature heat transfer fluids.
5. Fossil Fuel and Nuclear Power Plants: T11 tubes are used in environments where reliability and durability are key to maintaining operational efficiency.