SA 387 Gr 11 is a type of steel plate specification. Here's a breakdown: - SA: ASME specification for steel plates - 387: Specific standard for pressure vessel plates - Gr 11: Grade 11, indicating the steel's composition and properties SA 387 Gr 11 is a chromium-molybdenum alloy steel plate for pressure vessels and boilers, with excellent strength, toughness, and weldability. Key properties: - High-temperature strength and resistance - Good weldability and formability - Resistant to corrosion and oxidation - Minimum tensile strength: 60, 000 psi (415 MPa) - Minimum yield strength: 40, 000 psi (275 MPa) Common applications: - Pressure vessels - Boilers - Heat exchangers - Pipework - Power generation equipment