Difference between BV E460 and BV E620 steel plate

BV E460 is a high-strength shipbuilding steel plate certified by Bureau Veritas (BV) . The "E" grade signifies it is impact tested at -40°C, making it suitable for structures in cold environments like arctic waters . It has a minimum yield strength of 460 MPa and tensile strength ranging from 570 to 720 MPa, with minimum elongation of 17% . The chemical composition features carbon ≤0.20%, manganese ≤1.70%, and silicon ≤0.55% . This grade is typically supplied in quenched and tempered (QT) or thermomechanical controlled processed (TMCP) conditions . It is widely used for hull construction, decks, bulkheads, and offshore platforms requiring high strength and excellent weldability.

BV E620 is an ultra-high-strength marine steel also certified by Bureau Veritas (BV) with impact toughness tested at -40°C . The "620" denotes a minimum yield strength of 620 MPa . It has a tensile strength ranging from 720 to 890 MPa and minimum elongation of 15% . The chemical composition is strictly controlled with carbon ≤0.20%, manganese ≤1.70%, and microalloying elements . This grade requires advanced processing and is typically supplied in quenched and tempered (QT) or TMCP conditions . It is designed for the most demanding structural components in shipbuilding, offshore drilling units, and marine equipment requiring maximum strength-to-weight ratio.

Both BV E460 and BV E620 are BV-certified high-strength marine steels with excellent low-temperature toughness tested at -40°C, ensuring reliable performance in harsh marine environments including Arctic conditions . Their primary difference lies in strength level: E460 offers a minimum yield strength of 460 MPa with tensile strength of 570-720 MPa, suitable for general high-strength hull construction and offshore structures , while E620 provides a substantially higher minimum yield strength of 620 MPa with tensile strength reaching 720-890 MPa, designed for extra-high-strength applications in critical load-bearing components . Both grades feature controlled chemical composition with carbon ≤0.20% and manganese ≤1.70% , and require advanced processing like QT or TMCP to achieve their mechanical properties while maintaining good weldability for marine service.

Chemical Composition

Mechanical Property