Difference between BV D500 and BV D550 steel plate

BV D500 is an extra-high-strength marine steel plate certified by Bureau Veritas (BV). The "D" grade signifies it is impact tested at -20°C . It has a minimum yield strength of 500 MPa and tensile strength ranging from 610 to 770 MPa . 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, and structural components of ships and offshore structures.

BV D550 is an extra-high-strength marine steel also certified by Bureau Veritas (BV) with impact toughness tested at -20°C. The "550" denotes a minimum yield strength of 550 MPa. It has a tensile strength ranging from 670 to 830 MPa and minimum elongation of 16%. The chemical composition includes carbon ≤0.20%, manganese ≤1.70%, with strict control of phosphorus and sulfur . This grade requires advanced processing and is typically supplied in quenched and tempered (QT) or TMCP conditions . It is designed for demanding structural components in shipbuilding, offshore platforms, and marine equipment.

Both BV D500 and BV D550 are BV-certified extra-high-strength marine steels with impact toughness tested at -20°C, ensuring reliable performance in cold marine environments . Their primary difference lies in strength level: D500 offers a minimum yield strength of 500 MPa with tensile strength of 610-770 MPa , while D550 provides a higher minimum yield strength of 550 MPa with tensile strength reaching 670-830 MPa , designed for more demanding load-bearing applications. 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