ASTM A537 Class 2 is a specification for heat-treated, carbon-manganese-silicon steel plates intended for fusion-welded pressure vessels and structures. This steel grade is known for its higher yield and tensile strength compared to many other carbon steels, making it suitable for use in moderate to high-temperature pressure vessel applications.
The typical chemical composition of ASTM A537 Class 2 steel is as follows:
Carbon (C): 0.24% max
Manganese (Mn): 0.70 - 1.50%
Silicon (Si): 0.15 - 0.50%
Phosphorus (P): 0.035% max
Sulfur (S): 0.035% max
Copper (Cu): 0.35% max
Nickel (Ni): 0.25% max
Chromium (Cr): 0.25% max
Molybdenum (Mo): 0.08% max
Vanadium (V): 0.05% max
ASTM A537 Class 2 steel is heat-treated and exhibits the following mechanical properties:
Tensile Strength: 485 - 620 MPa (70 - 90 ksi)
Yield Strength: 345 MPa (50 ksi) minimum
Elongation: 18% minimum in 50 mm (2 inches)
Impact Energy: Specified as per requirements, often tested in accordance with the Charpy V-Notch test for toughness.
High Strength: Offers higher yield and tensile strength compared to many other carbon steel grades, making it suitable for applications requiring enhanced strength and durability.
Heat Treatment: The steel is normalized or stress relieved, which enhances its mechanical properties and makes it suitable for use in pressure vessels and high-pressure applications.
Good Weldability: Despite its higher strength, ASTM A537 Class 2 maintains good weldability, which is critical for the construction of pressure vessels and boilers.
Toughness: This grade offers good notch toughness, which is important for maintaining structural integrity under stress or impact conditions.
ASTM A537 Class 2 steel plates are commonly used in:
Pressure Vessels: For storing and transporting gases and liquids under high pressure.
Boilers: In both power plants and industrial settings.
Heat Exchangers: For transferring heat between different mediums.
Storage Tanks: For chemicals, petroleum products, and other liquids.
This steel grade's balance of strength, toughness, and weldability makes it a popular choice in the fabrication of equipment used in oil, gas, chemical, and power generation industries.
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