A516 Grade 55 is a carbon-manganese-silicon pressure vessel steel plate designed for moderate- and lower-temperature service in boilers, welded pressure vessels, and industrial process equipment. The grade offers reliable notch toughness, stable fabrication performance, and consistent strength across different thickness ranges. It is commonly used in petrochemical, power generation, and general industrial pressure systems requiring dependable plate quality and good weldability.

Chemical Composition (ASTM A516/A516M)

Carbon: ≤ 0.21% Manganese: 0.60–0.90% Silicon: 0.15–0.40% Phosphorus: ≤ 0.035% Sulfur: ≤ 0.035%

The carbon-manganese-silicon alloy system provides balanced strength, toughness, and weldability for pressure vessel fabrication.

Mechanical Properties Tensile Strength: 380–515 MPa Yield Strength: ≥ 205 MPa Elongation: ≥ 23% (200 mm gauge length) ≥ 27% (50 mm gauge length)

These values support safe operation in moderate- and lower-temperature pressure systems.

Size Range

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

Stock & Processing Services

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

Applications

Boilers and pressure drums

Industrial pressure vessels

Heat exchangers and condensers

Petrochemical equipment

Power generation components

Storage tanks and separators