A387 Grade 12 Class 2 is a chromium‑molybdenum pressure vessel steel plate used for medium‑temperature hydrogen service and high‑pressure equipment. It offers excellent creep resistance, oxidation resistance, and stable mechanical properties up to 550 °C. The steel is typically supplied in normalized and tempered condition to ensure uniform microstructure and weldability.

Chemical Composition (ASTM A387)

- C ≤ 0.15% - Mn 0.40–0.65% - Si 0.50–1.00% - Cr 1.00–1.50% - Mo 0.45–0.65% - P ≤ 0.035% - S ≤ 0.035%

Mechanical Properties

- Yield Strength: ≥ 275 MPa - Tensile Strength: 415–585 MPa - Elongation: ≥ 17% - Impact Energy: ≥ 55 J (at room temperature)

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

- Medium‑temperature hydrogen reactors - Petrochemical pressure vessels - Heat exchangers and boilers - Hydrogenation equipment