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ASTM A662 is a specification for carbon-manganese-silicon steel plates intended primarily for welded pressure vessels, where improved notch toughness is important. These steel plates are used in applications that involve moderate and lower temperature services. The material exhibits good weldability and moderate strength, making it ideal for use in environments where structural integrity and reliability under pressure are crucial.



A662 Grade A: This grade is a basic carbon-manganese-silicon steel plate used in the fabrication of pressure vessels and boilers. It offers moderate strength and good weldability, suitable for applications operating at lower temperatures.
A662 Grade B: Known for higher strength compared to Grade A, Grade B is used in pressure vessels that require greater durability and structural performance under pressure. It is ideal for medium temperature service and offers improved resistance to stress and strain.



A662 Grade C: The highest strength grade in the ASTM A662 series, Grade C is commonly used in pressure vessels that operate under higher pressures and temperatures. It provides enhanced toughness and durability, making it suitable for more demanding industrial environments.
ASTM A662 steel plates are commonly utilized in the construction of welded pressure vessels, boilers, and other components where moderate strength and good toughness are essential, especially in lower-temperature applications.


Grade Category Description
A662 Grade A Carbon-Manganese-Silicon Steel Basic grade with moderate strength and good weldability for lower temperature applications.
A662 Grade B Carbon-Manganese-Silicon Steel Higher strength than Grade A, used for pressure vessels requiring more durability.
A662 Grade C Carbon-Manganese-Silicon Steel Highest strength grade, suitable for higher pressure and temperature conditions.



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