SA 387 GR 5 CL 1 / CL 2 – Chrome-Moly Steel Plate for Moderate Heat and Pressure SA 387 Grade 5 Class 1 and Class 2 plates are chrome-moly alloy steels designed for pressure vessels operating in moderately high-temperature environments. With around 5% chromium and 0.5% molybdenum, they offer excellent resistance to oxidation, hydrogen attack, and thermal stress—making them a cost-effective choice in refineries, petrochemical plants, and power generation systems. Class 1 is suitable for lower-stress environments, while Class 2 offers higher mechanical strength for more demanding service conditions. Key Highlights: Resists Oxidation and Corrosion: Designed for components operating in chemically aggressive and high-temperature settings. Optimized for Elevated Temperatures: Retains mechanical integrity in environments reaching ~600°C. Versatile Strength Classes: Two options allow selection based on stress and temperature demands. Good Workability: Suitable for welding and forming with appropriate heat treatment. Mechanical Properties Overview: Property SA 387 Gr 5 Cl 1 SA 387 Gr 5 Cl 2 Yield Strength ≥ 205 MPa ≥ 220 MPa Tensile Strength 415–585 MPa 515–690 MPa Elongation ≥ 20% ≥ 18% Max Temperature Up to ~600°C Up to ~600°C Typical Applications: Pressure vessels in refineries and chemical plants Boilers, heat exchangers, and reactors Equipment in hydrogen-rich environments Steam service components requiring long-term durability