What are difference between BV D420 and BV D460 steel plate?

BV D420 is a high-strength shipbuilding steel plate certified by Bureau Veritas (BV) . The "D" grade indicates it is tested for impact toughness at -20°C . The number "420" specifies its minimum yield strength of 420 MPa . It has a tensile strength ranging from 530 to 680 MPa and minimum elongation of 18% . The chemical composition is carefully controlled with carbon ≤0.20%, manganese ≤1.70%, and microalloying elements to enhance properties . It is typically supplied in controlled rolled or normalized conditions and is widely used for hull construction, decks, and offshore structures.

BV D460 is an extra-high-strength marine steel also certified by Bureau Veritas (BV) with impact testing at -20°C . The "460" denotes a minimum yield strength of 460 MPa. It has a higher tensile strength ranging from 570 to 720 MPa and minimum elongation of 17% . The impact energy requirement is higher than D420, requiring minimum 31J (transverse) or 46J (longitudinal) at -20°C . This grade is typically supplied in quenched and tempered (QT) or TMCP conditions to achieve its superior mechanical properties . It is designed for demanding structural components in ships, offshore platforms, and marine engineering projects.

Both BV D420 and BV D460 are BV-certified high-strength marine steels with impact toughness tested at -20°C, ensuring reliable performance in moderate low-temperature marine environments . Their primary difference lies in strength level: D420 offers a minimum yield strength of 420 MPa with tensile strength of 530-680 MPa, suitable for general high-strength hull construction, while D460 provides a higher minimum yield strength of 460 MPa with tensile strength reaching 570-720 MPa, designed for more demanding load-bearing applications. Both grades feature controlled chemical composition with maximum carbon 0.20% and manganese 1.70%, but D460 typically requires more advanced heat treatment (QT or TMCP) to achieve its enhanced mechanical properties while maintaining good weldability for marine service.

Chemical Composition

Mechanical Property