ASTM A537 Class 2 chemical composition, mechanical properties

The ASTM A537 Class 2 specification covers heat-treated carbon-manganese-silicon steel plates intended for fusion-welded pressure vessels and is commonly used in applications where improved notch toughness is required. Here are the chemical composition and mechanical properties of ASTM A537 Class 2:

ASTM A537 Class 2 Chemical Composition (Percentage by weight):

• Carbon (C): 0.24% max
• Manganese (Mn): 0.70-1.35%
• Phosphorus (P): 0.035% max
• Sulfur (S): 0.035% max
• Silicon (Si): 0.15-0.50%
• Copper (Cu): 0.35% max
• Nickel (Ni): 0.25% max
• Chromium (Cr): 0.25% max
• Molybdenum (Mo): 0.08% max
• Vanadium (V): 0.03% max

ASTM A537 Class 2 Mechanical Properties:

• Tensile Strength: 485-620 MPa (70-90 ksi)
• Yield Strength: 345 MPa (50 ksi) min
• Elongation in 2 inches (50 mm): 22% min
• Elongation in 8 inches (200 mm): 18% min
• Impact Energy (Charpy V-notch): 27 J (20 ft-lbf) min at -46°C (-50°F)

These values are typical, and actual mechanical properties may vary depending on plate thickness and heat treatment conditions. It is important to consult the specific requirements of the applicable standard or specification for detailed information regarding the chemical composition and mechanical properties of ASTM A537 Class 2 steel plates.