Standard
SA204GrB is a molybdenum-alloy pressure vessel steel plate manufactured in accordance with ASME SA-204/SA-204M standards. It is fully equivalent to ASTM A204/A204M-12 and also aligns with the earlier ASTM A204/A204M-03 specification.
Designation Meaning
SA: Indicates steel for boilers and pressure vessels under the ASME/ASTM system.
204: The specification number, defining chemical composition and application scope.
Gr: Short for Grade, denoting classification within the series.
B: One of the commonly used grades (along with A and C), each with distinct chemical and mechanical requirements.
Chemical Composition & Key Properties
SA204GrB contains molybdenum (Mo) as the main alloying element, enhancing strength and corrosion resistance. Its main performance features include:
◎High strength combined with reliable toughness
◎Excellent resistance to corrosion and elevated temperature service
◎Good weldability for pressure vessel fabrication
◎Stable impact toughness even at lower service temperatures
◎Easy processing and forming adaptability
Applications
SA204GrB steel plates are widely used in petrochemical, power generation, and boiler industries, especially for the fabrication of reactors, heat exchangers, separators, spherical tanks, nuclear power pressure vessels, LPG storage, steam boiler drums, and high-pressure pipelines.
✅ Choose Gnee Steel for Reliable Quality
With extensive experience in supplying boiler and pressure vessel steel plates, Gnee Steel offers SA204GrB products that strictly comply with international standards. We provide complete size ranges, customized solutions, and fast delivery to support your industrial projects.
📩 Contact Gnee Steel today to get the latest SA204GrB quotation and technical support!