ASTM A517 Grade B steel

A high-strength quenched-and-tempered alloy steel plate engineered for heavy-duty pressure components and structural supports. ASTM A517 Grade B combines elevated yield and tensile strength with good toughness and weldability, making it well suited for boilers, pressure vessels, mechanical supports in nuclear and power plants, and other high-stress welded fabrications.

Key features

• Conforms to ASTM A517 Grade B material requirements for high-strength pressure-vessel and structural plate (quenched and tempered)
• High yield and tensile strength with good plasticity and impact toughness
• Controlled chemistry: low phosphorus and sulfur with alloying and deoxidation elements (e.g., C, Si, Mn, Cr, Mo, V, Ti) to achieve required mechanical properties and hardenability
• Good weldability when proper preheat and welding procedures are used; weldability decreases as carbon and alloy content increase
• Supplied as plate suitable for cutting, forming and welding

Typical applications

• Boilers and pressure vessels
• Mechanical and structural supports for nuclear and power plants
• Heavy fabrications where high strength and toughness are required

Technical notes

• Material is supplied in the quenched-and-tempered condition; mechanical and chemical test data are typically used to verify conformity to specification
• For critical welded assemblies, follow recommended preheat/interpass and post-weld heat treatment procedures to maintain toughness and avoid brittle behavior

For ordering, specify required plate thickness, dimensions, quantity, and any testing/certification needs (mill test report, material test report, heat treatment records).