A387 Grade 22 Class 1 is a 2.25Cr‑1Mo alloy pressure vessel steel plate designed for medium‑temperature hydrogen service and high‑pressure petrochemical equipment. It provides excellent creep resistance, hydrogen corrosion resistance, and thermal stability up to approximately 600°C. The steel is supplied in normalized and tempered condition to ensure uniform microstructure and reliable weldability for large‑scale pressure vessels.

Chemical Composition

• C ≤ 0.15%

• Mn 0.30–0.60%

• Si 0.50–1.00%

• Cr 1.90–2.60%

• Mo 0.87–1.13%

• P ≤ 0.035%

• S ≤ 0.035%

Cr‑Mo alloying provides oxidation resistance and long‑term creep strength under hydrogen exposure.

Mechanical Properties

• Yield Strength: ≥ 205 MPa

• Tensile Strength: 415–550 MPa

• Elongation: ≥ 20%

• Impact Energy: ≥ 55 J（room temperature）

These properties ensure safe performance in hydrogen reactors and high‑temperature pressure systems.

Size Range

Thickness: 3–150 mm Width: 1220–4200 mm Length: 5000–18000 mm

Stock & Processing Services

Cutting • Beveling • Heat treatment • Welding preparation • Custom fabrication for pressure vessels

Applications

• Hydrogenation reactors

• High‑temperature petrochemical vessels

• Heat exchangers and boilers

• Hydrogen service pressure equipment