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ASTM A387 Alloy Steel Gr 21 Plates are a specific type of steel plates designed for high-temperature applications in various industries. These plates are part of the ASTM A387 standard, which covers alloy steel plates intended primarily for welded boilers and pressure vessels designed for elevated temperature service. Gr 21 refers to the grade of the alloy steel, and it has distinct features and applications that make it suitable for specific environments.

Features of ASTM A387 Alloy Steel Gr 21 Plates:

  • High Tensile Strength: Alloy Steel Gr 21 plates exhibit excellent tensile strength, providing robust structural integrity and resistance to deformation under high-pressure conditions.
  • Corrosion Resistance: The alloy composition includes elements like chromium, which enhances the corrosion resistance of the plates. This is crucial for applications where exposure to corrosive environments is prevalent.
  • High-Temperature Resistance: Designed for elevated temperature service, these plates can withstand high temperatures without losing their structural integrity. This property makes them ideal for use in boilers and pressure vessels where heat resistance is essential.
  • Good Weldability: Alloy Steel Gr 21 plates have good weldability, facilitating the fabrication of complex structures and ensuring a secure and durable connection in various applications.
  • Durable and Long-lasting: The alloy steel composition and heat treatment contribute to the durability of these plates, ensuring a long service life even under demanding conditions.
  • Versatility: These plates are versatile and find applications in various industries, including power generation, petrochemical, chemical processing, and more, where high-temperature and pressure conditions are common.
  • Compliance with Standards: ASTM A387 sets strict standards for alloy steel plates, ensuring that Gr 21 plates meet quality and safety requirements. This compliance assures reliability in critical applications.

Applications of Alloy Steel Gr 21 Plates:

  • Boilers: ASTM A387 Alloy Steel Gr 21 Plates are commonly used in building boilers for power generation. High-temperature resistance and excellent tensile strength suit them to contain pressurized steam.
  • Pressure Vessels: Industries such as petrochemical and chemical processing often utilize pressure vessels for various processes. Alloy Steel Gr 21 Plates are designed to withstand elevated temperatures and pressures in these applications.
  • Oil and Gas Industry: In the oil and gas sector, where equipment is exposed to high temperatures and corrosive environments, these plates are employed to fabricate components like heat exchangers and separators.
  • Energy Generation: Alloy Steel Gr 21 Plates are essential in the energy sector, particularly for components in power plants. They contribute to the construction of boilers, which are central to electricity generation.
  • Chemical Processing: The chemical industry involves processes that often require materials capable of withstanding aggressive chemical environments. Alloy Steel Gr 21 Plates' corrosion resistance and high-temperature stability make them suitable for chemical processing applications.
  • Aerospace and Defense: In certain aerospace and defense applications, where components may experience extreme conditions, these plates are utilized to ensure structural integrity and reliability.
  • Refinery Equipment: Refineries involve processing crude oil and other substances at high temperatures. Alloy Steel Gr 21 Plates are employed to construct equipment like reactors and distillation columns.

ASTM A387 Alloy Steel Gr 21 Plates offer a combination of high tensile strength, corrosion resistance, and temperature stability, making them well-suited for demanding applications in industries such as power generation, petrochemical, chemical processing, and more.

FAQ's for Alloy Steel Gr 21 Plates

The pressure rating of Alloy Steel A387 GR 21 Plates is up to 50,000 psi and its maximum temperature is 1,100°F (593°C).

 No, Alloy Steel A387 GR 21 Plates does not corrode easily. It has excellent corrosion resistance due to its alloyed steel composition.

The appropriate welding technique for Alloy Steel A387 GR 21Plates is SMAW (Shielded Metal Arc Welding) or GTAW (Gas Tungsten Arc Welding).

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