A387 Grade 22 Class 2 is a 2.25Cr‑1Mo alloy pressure vessel steel plate designed for medium‑temperature hydrogen service and high‑pressure petrochemical equipment. Compared with Class 1, Class 2 provides higher strength, improved creep resistance, and enhanced stability under elevated temperatures up to approximately 600°C. The steel is supplied in normalized and tempered condition to ensure uniform microstructure, reliable weldability, and long‑term performance in hydrogen‑rich environments.

Chemical Composition (ASTM A387)

• Carbon: ≤ 0.15%

• Manganese: 0.30–0.60%

• Silicon: 0.50–1.00%

• Chromium: 1.90–2.60%

• Molybdenum: 0.87–1.13%

• Phosphorus: ≤ 0.035%

• Sulfur: ≤ 0.035%

Cr‑Mo alloying provides oxidation resistance, hydrogen corrosion resistance, and long‑term creep strength.

Mechanical Properties

• Yield Strength: ≥ 240 MPa

• Tensile Strength: 450–585 MPa

• Elongation: ≥ 20%

• Impact Energy: ≥ 55 J (room temperature)

These properties support safe operation in hydrogen reactors and high‑temperature pressure systems.

Size Range (Website 5 Standard Template)

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