ASTM A537 Class 2 is a standard specification for pressure vessel plates, heat-treated, carbon-manganese-silicon steel. This grade is primarily used in the construction of pressure vessels, boilers, and other equipment where high strength is required. The steel is normalized or quenched and tempered to provide greater tensile and yield strength compared to other carbon steels.
Material Composition:
Carbon (C): 0.24% maximum
Manganese (Mn): 0.90-1.70%
Silicon (Si): 0.15-0.50%
Phosphorus (P): 0.035% maximum
Sulfur (S): 0.035% maximum
Other elements: Traces of elements like copper, nickel, chromium, molybdenum, vanadium, etc., may be present as per specific requirements.
Mechanical Properties:
Tensile Strength: 485-620 MPa (70-90 ksi)
Yield Strength: Minimum of 345 MPa (50 ksi)
Elongation: 22% minimum in 200 mm (8 inches) or 25% minimum in 50 mm (2 inches)
Heat Treatment:
Normalized: The steel is heated above its critical temperature, then air-cooled. This process refines the grain structure and improves mechanical properties.
Quenched and Tempered (Q&T): This process involves heating the steel to a high temperature, followed by rapid cooling (quenching), and then reheating to a lower temperature (tempering) to enhance toughness and reduce brittleness.
Applications:
Pressure Vessels: Used in the manufacturing of tanks, boilers, and other pressure-containing equipment.
Heat Exchangers: Commonly used in heat exchangers due to its strength and resistance to high pressure and temperature.
Oil and Gas Industry: Suitable for use in pressure vessels and tanks where high strength and durability are required.
Standards and Testing:
The material must meet the chemical composition and mechanical property requirements as specified by ASTM A537.
Testing includes tensile tests, impact tests (typically Charpy V-notch), and other tests as required by the application or client specifications.
ASTM A537 Class 2 is a high-strength steel plate used for pressure vessels and other applications requiring high tensile and yield strength. The material is typically normalized or quenched and tempered to achieve the desired mechanical properties, making it suitable for use in critical pressure-containing applications.
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