SA 387 GR 12 CL 1 / CL 2 – Enhanced Chrome-Moly Steel for High-Temperature Pressure Equipment SA 387 Grade 12 Class 1 and Class 2 plates are alloy steels containing approximately 1% chromium and 0.5% molybdenum, engineered for use in pressure vessels and high-temperature service. Offering excellent oxidation resistance, moderate creep strength, and thermal stability, these plates are ideal for applications exposed to steam, gas, and mild corrosive environments. With Class 1 suited for standard temperature-pressure conditions and Class 2 offering greater mechanical strength, SA 387 GR 12 provides a versatile solution for industrial thermal systems. Key Highlights: Improved Resistance in Thermal Environments: Withstands high temperatures up to ~600°C without significant loss in strength or durability. Balanced Chromium-Moly Composition: Offers corrosion and oxidation resistance without compromising formability. Available in Two Strength Levels: Class 1 is economical for general use, while Class 2 meets higher strength and pressure demands. Excellent Fabrication Properties: Easily welded, cut, and formed with conventional methods using proper thermal controls. Mechanical Properties Overview: Property SA 387 Gr 12 Cl 1 SA 387 Gr 12 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: High-pressure steam boilers and headers Petrochemical and refinery heat exchangers Hydrogen service vessels and piping Thermal reactors and processing equipment Conclusion: SA 387 GR 12 CL 1 / CL 2 plates deliver dependable performance in environments where elevated temperatures and oxidation risks are a concern. With solid mechanical properties and excellent workability, they’re a reliable choice for pressure-containing systems in energy, refining, and industrial sectors.