SA 387 is a type of steel plate grade specified in the ASME (American Society of Mechanical Engineers) standards. Specifically, SA 387 is a grade of chrome-molybdenum steel plate used for pressure vessels and other high-temperature applications. Here are some key properties and features of SA 387 steel: - Composition: 0.5-0.8% Chromium, 0.3-0.6% Molybdenum, and 0.1-0.3% Manganese - Strength: High tensile strength (around 55-80 ksi or 380-550 MPa) - Temperature resistance: Good resistance to high temperatures (up to 600°C/1112°F) - Corrosion resistance: Good resistance to corrosion in acidic and alkaline environments - Weldability: Good weldability with common welding processes SA 387 steel is commonly used in applications such as: - Pressure vessels (boilers, tanks, etc.) - Heat exchangers - Piping and tubing - Furnace components - Power generation equipment There are several subclasses of SA 387, including: - SA 387 Grade 11 (1.25% Chromium, 0.5% Molybdenum) - SA 387 Grade 12 (1.25% Chromium, 0.5% Molybdenum, 0.1% Vanadium) - SA 387 Grade 22 (2.25% Chromium, 1% Molybdenum) - SA 387 Grade 91 (9% Chromium, 1% Molybdenum, 0.2% Vanadium) Each subclass has slightly different composition and properties, so it's important to specify the correct grade for your application. If you have any specific questions or need more information, feel free to ask!