Difference between BVE420 and BV E500 steel plate

BV E420 is a high-strength shipbuilding steel plate certified by Bureau Veritas (BV) . The "E" grade signifies it is impact tested at -40°C, with minimum impact energy of 28J (transverse) or 42J (longitudinal) . It has a minimum yield strength of 420 MPa and tensile strength ranging from 530 to 680 MPa, with minimum elongation of 18% . The chemical composition is strictly controlled with 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 operating in cold marine environments .

BV E500 is an extra-high-strength marine steel also certified by Bureau Veritas (BV) with impact toughness tested at -40°C, requiring minimum impact energy of 33J (transverse) or 50J (longitudinal) . The "500" denotes a minimum yield strength of 500 MPa . It has a tensile strength ranging from 610 to 770 MPa and minimum elongation of 16% . The chemical composition features 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 structures requiring superior strength-to-weight ratio.

Both BV E420 and BV E500 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: E420 offers a minimum yield strength of 420 MPa with tensile strength of 530-680 MPa, suitable for general high-strength hull construction , while E500 provides a higher minimum yield strength of 500 MPa with tensile strength reaching 610-770 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 critical marine service.

Chemical Composition

Mechanical Property