ASTM A537 Class 2 is a specification for carbon-manganese-silicon pressure vessel steel plates intended for use in welded boilers and pressure vessels where improved notch toughness is required at lower temperatures. The steel is normally supplied in the quenched and tempered condition, which gives it enhanced strength and toughness compared to lower-strength carbon steels. It is designed to provide good weldability and reliable performance under moderate to higher pressure and temperature conditions commonly found in oil, gas, and petrochemical processing equipment, as well as in power generation applications. The class designation indicates a specific combination of mechanical properties, particularly in terms of yield and tensile strength, along with impact energy requirements that ensure resistance to brittle fracture.
Chemical Composition of ASTM A537 Class 2
| Grade | C | Si | Mn | P | S | Cr | Mo | Ni | Cu | |
|---|---|---|---|---|---|---|---|---|---|---|
| ¡Ü 40 mm | > 40 mm | |||||||||
| A537 Class 2 | 0.24 | 0.15/0.50 | 0.70/1.35 | 1.00/1.60 | 0.035 | 0.035 | 0.025 | 0.080 | 0.25 | 0.35 |
Mechanical Properties of ASTM A537 Class 2
| Grade | Yield (MPa) | Tensile (MPa) | Elongation | Thickness | |
|---|---|---|---|---|---|
| A50mm | A200mm | ||||
| A537 Class 2 | 415 | 550/690 | 22% | - | ¡Ü 65 |
| 380 | 515/655 | 22% | - | > 65 ¡Ü 100 | |
| 315 | 485/620 | 22% | - | > 100 ¡Ü 150 | |
applications
Pressure vessels and boilers:
Used for welded pressure vessels, boilers, and related pressure-retaining components that operate at moderate to elevated temperatures and need good low-temperature toughness.
Oil, gas, and petrochemical equipment:
Applied in process vessels, separators, scrubbers, and other equipment handling hydrocarbons and process fluids under pressure.
Heat exchangers and storage tanks:
Utilized in heat exchangers, as well as storage tanks and pressure vessels for various liquids and gases.
Power generation systems:
Employed in boiler components and power plant equipment where reliable performance under thermal and mechanical stress is required.
General industrial equipment:
Used in a range of industrial applications that demand high strength, good weldability, and resistance to brittle fracture.
Full specification and details are available on request. The above information is provided for guidance purposes only. For specific design requirements please contact our technical sales staff.
What is A537 Class 2 material?
ASTM A537 Class 2 steel is a higher yield and tensile strength material used in the fabrication of pressurised vessels and steel boilers. The steel includes the alloying of carbon, manganese and silicon and is heat treated using the quenched and tempered method which gives the material its residual strength.
What is the equivalent of A537 steel?
Its primary equivalent is ASME SA537 Cl. 1, which shares identical specifications under the ASME SA537/SA537M standard. Internationally, equivalents include EN 10028-2 P355GH (1.0473), a non-alloy quality steel with similar yield strength and composition for elevated temperature vessels.