A387 Grade 5 Class 2 is a 0.5Cr‑0.5Mo alloy pressure vessel steel plate designed for medium‑temperature hydrogen service and refinery equipment operating under elevated temperatures. Compared with Class 1, Class 2 provides higher strength, improved creep resistance, and enhanced stability for petrochemical vessels, hydrogen reactors, and high‑temperature pressure systems. The steel is supplied in normalized and tempered condition to ensure uniform microstructure and dependable weldability.

Chemical Composition (ASTM A387)

• Carbon: ≤ 0.15%

• Manganese: 0.30–0.60%

• Silicon: 0.50–1.00%

• Chromium: 0.40–0.65%

• Molybdenum: 0.45–0.60%

• Phosphorus: ≤ 0.035%

• Sulfur: ≤ 0.035%

The Cr‑Mo alloy system provides oxidation resistance and long‑term stability under hydrogen exposure.

Mechanical Properties

• Yield Strength: ≥ 260 MPa

• Tensile Strength: 450–585 MPa

• Elongation: ≥ 18%

• Impact Energy: ≥ 55 J (room temperature)

These values support safe operation in hydrogen reactors and refinery 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

• Refinery pressure vessels

• High‑temperature petrochemical equipment

• Heat exchangers and boilers