ASTM A537 Class 2 is a specification for heat-treated carbon-manganese-silicon steel plates intended for pressure vessel applications. These plates are normalized or quenched and tempered to enhance their mechanical properties, making them suitable for use in pressure vessels and boilers. Below are the key specifications for ASTM A537 Class 2:
The chemical composition of ASTM A537 Class 2 steel plate typically includes the following elements:
Carbon (C): 0.24% max
Manganese (Mn): 0.70–1.60%
Silicon (Si): 0.15–0.50%
Phosphorus (P): 0.035% max
Sulfur (S): 0.035% max
Other elements: Small quantities of other elements such as copper, nickel, chromium, molybdenum, and vanadium may also be present, but they are typically controlled to achieve specific mechanical properties.
The mechanical properties of ASTM A537 Class 2 are as follows:
Tensile Strength: 485–620 MPa (70,000–90,000 psi)
Yield Strength: 345 MPa (50,000 psi) min
Elongation: 22% min in 2 inches (50mm) gauge length for plates up to 2.5 inches (63.5mm) in thickness.
Normalized: The plates are supplied in the normalized condition, which involves heating the steel to a high temperature and then allowing it to cool slowly to room temperature.
Quenched and Tempered: Some plates may also undergo quenching and tempering to further enhance their mechanical properties. This process involves heating the steel to a high temperature, followed by rapid cooling (quenching) and then reheating to a lower temperature (tempering).
ASTM A537 Class 2 steel plates are commonly used in the fabrication of pressure vessels and boilers for the oil, gas, and petrochemical industries. They are also used in high-temperature and high-pressure environments, where enhanced strength and toughness are required.
The plates are typically available in thicknesses ranging from 6mm to 150mm (0.25 inches to 6 inches).
ASTM A537 Class 2 plates comply with various international standards and are often certified for use in specific pressure vessel applications. They meet the requirements of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code.
ASTM A537 Class 2 steel plates are designed for use in pressure vessels and boilers, where enhanced strength and toughness are required. The steel is heat-treated, typically normalized or quenched and tempered, to achieve the necessary mechanical properties. It is commonly used in industries such as oil, gas, and petrochemicals.
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