Steels for pressure vessels and boilers differ from other carbon-manganese structural steels due to their high resistance to pressure at all temperatures (ambient, low or high).

The fundamental property of steels for pressure vessels is their ability to withstand high pressure at different temperatures. They have good weldability, as well as excellent toughness, and are suitable for normalisation annealing and stress-relief annealing (both treatments neutralise local hardening caused by welding).

Steels for pressure vessels are mainly used to manufacture boilers, drums, pressure or steam piping, industrial thermal vessels and heat exchangers. These steels are suitable for mechanical forming and welding.

Options available after previous agreement for the different groups of grades:

European standards

• Vacuum degassing
• Reduced CEV
• Product analysis
• PWHT on test specimens
• Charpy impact test in transverse direction
• High temperature tensile test
• Ultrasonic testing
• Improved deformation properties perpendicular to the surface of the product as per EN 10164 (Z test)
• Bending test
• Sour services 

ASTM A204

• Vacuum degassing
• PWHT on test specimens
• Charpy impact test
• High temperature tensile test

ASTM A285

• Product delivered normalised
• PWHT on test specimens
• Bending test
• Copper content between 0.20 and 0.35%

ASTM A515

• Vacuum degassing
• Austenitic grain size
• Product analysis
• PWHT on test specimens
• Charpy impact test
• High temperature tensile test
• Ultrasonic testing
• Bending test

ASTM A516

• Vacuum degassing
• Austenitic grain size
• Product analysis
• PWHT on test specimens
• Charpy impact test
• High temperature tensile test
• Ultrasonic testing
• Bending test

ASTM A537

• Vacuum degassing
• Product analysis
• PWHT on test specimens
• Charpy impact test
• High temperature tensile test
• Ultrasonic testing
• Bending test

Pressure vessel plates, heat treated, in carbon-manganese-silicon steel (ASTM A537)

Pressure vessel plates, in carbon steel, for intermediate- and high-temperature service (ASTM A515)

Pressure vessel plates, in carbon steel, for intermediate- and low-temperature service (ASTM A516)

Pressure vessel plates, in carbon steel, low and intermediate tensile strength (ASTM A285)

Pressure vessel plates, in molybdenum alloy steel (ASTM A204)

Steels for simple pressure vessels (EN 10207:2005)

Steels with specified properties at elevated temperatures (EN 10028-2:2009)

Weldable fine grain steels, normalised (EN 10028-3:2009)

For the dimensions available, see Table A in data sheet H99.

P355GH is available up to 100 mm thickness.

P355N/NH-NL1/NL2 is available up to 100 mm thickness.

P460NH/NL1/NL2 is available up to 80 mm thickness.

Pressure vessel plates, heat treated, in carbon-manganese-silicon steel (ASTM A537)

Pressure vessel plates, in carbon steel, for intermediate- and high-temperature service (ASTM A515)

Pressure vessel plates, in carbon steel, for intermediate- and low-temperature service (ASTM A516)

Pressure vessel plates, in carbon steel, low and intermediate tensile strength (ASTM A285)

Pressure vessel plates, in molybdenum alloy steel (ASTM A204)

Steels for simple pressure vessels (EN 10207:2005)

Steels with specified properties at elevated temperatures (EN 10028-2:2009)

Weldable fine grain steels, normalised (EN 10028-3:2009)

Steels for simple pressure vessels (EN 10207:2005)

Steels with specified properties at elevated temperatures (EN 10028-2:2009)

Weldable fine grain steels, normalised (EN 10028-3:2009)