A387 Grade 11 Class1 steel is a chromium-molybdenum alloy steel that is commonly used in pressure vessel applications. Its excellent corrosion resistance and high-temperature strength make it an ideal choice for industries such as oil and gas, chemical processing, and power generation.
Chemical Composition
The chemical composition of A387 Grade 11 Class1 steel includes:
Carbon (C): 0.05 - 0.17%
Manganese (Mn): 0.40-0.65%
Phosphorus (P): 0.035% max
Sulphur (S): 0.035% max
Silicon (Si): 0.50-0.80%
Chromium (Cr): 1.00-1.50%
Molybdenum (Mo): 0.45-0.60%
Mechanical Properties
The mechanical properties of A387 Grade 11 Class1 steel include:
Tensile Strength: 415-585 MPa (60-85 ksi)
Yield Strength: 240 MPa (35 ksi) min
Elongation: 22% min in 200mm, 18% min in 50mm
Reduction of Area: 40% min
Applications
A387 Grade 11 Class1 steel plate is primarily used in pressure vessel applications, including:
Oil and gas industry: A387 Grade 11 Class1 steel is widely used in the fabrication of oil and gas storage tanks and pressure vessels due to its excellent corrosion resistance and high-temperature strength.
Chemical processing industry: The alloy's high-temperature strength and resistance to corrosive environments make it an ideal choice for chemical processing equipment, such as reactors and distillation columns. Power generation industry: A387 Grade 11 Class1 steel is used in power plant applications, including boiler and pressure vessel components.
Fabrication
A387 Grade 11 Class1 steel plate can be easily fabricated using common industrial techniques. It is recommended that preheat and interpass temperatures be maintained throughout welding to avoid cracking or other defects. Post-weld heat treatment may also be required to ensure optimal mechanical properties.
A387 Grade 11 Class1 steel plate is a versatile alloy that offers excellent corrosion resistance and high-temperature strength. Its wide range of applications across various industries makes it an essential material for pressure vessel fabrication. The chemical composition and mechanical properties of this alloy make it a reliable choice for various critical applications.
