What is SA 387? SA 387 is a specification for alloy steel plates, chromium-molybdenum steel, designed for high-temperature applications. The specification is published by the American Society for Testing and Materials (ASTM). Key Features: 1. Chromium-Molybdenum Steel: SA 387 plates contain 0.5-9.5% chromium and 0.45-1.05% molybdenum, which enhance strength, hardness, and corrosion resistance. 2. High-Temperature Resistance: SA 387 plates can withstand temperatures up to 1200°F (650°C) without losing their strength or integrity. 3. Strength: SA 387 plates exhibit high tensile strength (up to 90, 000 psi) and yield strength (up to 50, 000 psi). 4. Corrosion Resistance: The chromium content provides resistance to corrosion in harsh environments. Applications: 1. Boilers: SA 387 plates are used in boiler components, such as pressure vessels, heat exchangers, and piping. 2. Pressure Vessels: They are used in high-pressure vessels, tanks, and reactors. 3. Power Generation: SA 387 plates are used in power generation equipment, such as turbines and generators. 4. Oil and Gas: They are used in oil and gas industry equipment, such as separators, heaters, and processing vessels. Common Grades: 1. Grade 11: 1.25% chromium, 0.5% molybdenum 2. Grade 12: 1.25% chromium, 0.5% molybdenum (with vanadium) 3. Grade 22: 2.25% chromium, 1% molybdenum 4. Grade 91: 9% chromium, 1% molybdenum (with vanadium) This brief summary should give you a good overview of Alloy Steel Plates SA 387. If you have any specific questions or need further information, feel free to ask!