ASME SA 387 Grade 12 Alloy Steel Plates are chromium-molybdenum (Cr-Mo) alloy steels designed for use in pressure vessels and boilers operating at elevated temperatures. These plates conform to ASME SA 387 / ASTM A 387 standards and are available in Grade 12, Class 1 and Class 2. They are widely used in the fabrication of equipment such as heat exchangers, power generation units, and petrochemical and refinery vessels where high-temperature strength, corrosion resistance, and oxidation resistance are essential.