FAQ

Q: What is the difference between ASME SA537 Class 2 and Class 3?

A: ASME SA537 Class 2 offers higher yield strength (415 MPa for ≤65mm) for more demanding applications, while Class 3 provides a slightly lower yield (380 MPa) but with enhanced toughness, making it ideal for low-temperature services where impact resistance is key.

Q: What are the typical applications for ASME SA537 Class 3 plates?

A: These plates are primarily used in pressure vessels and boilers for industries like oil and gas, petrochemicals, and power generation. They’re ideal for fabricating components that handle elevated temperatures and pressures, such as boiler drums and storage tanks in pressurized services.

Q: Is ASME SA537 Class 3 the same as ASTM A537 Class 3?

A: Yes, they are essentially equivalent standards. ASME SA537 is the boiler and pressure vessel code version, while ASTM A537 is the material specification, but both define the same heat-treated carbon-manganese-silicon steel for pressure vessels.

Q: What thickness ranges are available for ASME SA537 Class 3 plates?

A: Plates are typically available from 6mm to 150mm in thickness, making them versatile for various boiler designs. Thicker plates may have adjusted mechanical properties for optimal performance.

Q: Does ASME SA537 Class 3 require impact testing?

A: Yes, it often includes Charpy V-notch impact testing, especially for low-temperature applications, to ensure notch toughness and resistance to brittle failure. Gangsteel provides plates that meet these requirements as standard.

Q: Can ASME SA537 Class 3 be used in sour service environments?

A: It offers good resistance to hydrogen-induced cracking, making it suitable for sour service in oil and gas applications, provided proper alloying and testing are applied.

Q: What welding electrodes are recommended for ASME SA537 Class 3?

A: For welding, electrodes like E8018 are commonly used to match the material’s tensile strength. Always follow ASME Section IX guidelines for qualified procedures.

Q: Is post-weld heat treatment (PWHT) required for ASME SA537 Class 3?

A: PWHT may be exempted under certain conditions, but it can affect weld strength. Consult codes like ASME Section VIII for specific requirements to avoid weakening the weld compared to the base metal.