SA 387 Gr 11 Cl 2 is a type of steel plate specification: - SA 387: This is a specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum, developed by the American Society of Mechanical Engineers (ASME). - Gr 11: This refers to the grade of steel, which is a chromium-molybdenum alloy steel. - Cl 2: This refers to the class of steel, which indicates the steel's strength and composition. Key properties of SA 387 Gr 11 Cl 2 steel: - High-temperature strength and resistance to oxidation - Good weldability and formability - Excellent resistance to corrosion and wear - Minimum yield strength: 275 MPa (40 ksi) - Minimum tensile strength: 485-620 MPa (70-90 ksi) SA 387 Gr 11 Cl 2 steel is commonly used in: - Power generation equipment - Petrochemical processing equipment - Oil and gas refining equipment - Pressure vessels and boilers - Heat exchangers and piping systems