SA 387 GR 22 CL 1 / CL 2 – Durable Chrome-Moly Steel for High-Pressure, High-Temperature Environments SA 387 Grade 22 Class 1 and Class 2 plates are advanced alloy steels formulated with 2.25% chromium and 1% molybdenum, designed to perform reliably under elevated temperatures and high pressures. Engineered for use in pressure vessels, boilers, and thermal processing systems, these plates deliver excellent creep resistance, thermal strength, and oxidation resistance, making them a trusted choice in power generation, oil refining, and chemical industries. Class 1 is well-suited for general high-temperature service, while Class 2 is optimized for applications requiring greater mechanical strength. Key Benefits: Strong Performance in Heat-Intensive Conditions: Withstands long-term thermal exposure up to ~620°C with dependable mechanical integrity. Effective Oxidation and Hydrogen Resistance: Chromium-molybdenum alloying ensures protection in hot, corrosive, and hydrogen-laden environments. Adaptable Strength Classes: Class 1 serves most pressure applications, while Class 2 excels under greater mechanical and thermal demands. Ease of Fabrication: Readily weldable and formable when using appropriate thermal treatments, suitable for custom vessel builds. Mechanical Properties Snapshot: Property SA 387 Gr 22 Cl 1 SA 387 Gr 22 Cl 2 Yield Strength ≥ 205 MPa ≥ 220 MPa Tensile Strength 415–585 MPa 515–690 MPa Elongation ≥ 20% ≥ 18% Max Service Temp Up to ~620°C Up to ~620°C Common Applications: Steam boilers, reheaters, and superheater tubing Pressure vessels in high-temperature refinery operations Hydrogen reactors and synthesis gas units Thermal exchangers and pressure systems in power plants Summary: With its proven performance in extreme service conditions, SA 387 GR 22 CL 1 / CL 2 remains a reliable material solution for pressure-bound systems in thermal, chemical, and energy sectors. Its combination of heat resistance, structural strength, and fabrication ease ensures long-term durability in demanding industrial setups.