Difference between BV E460 and BV E550 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, with minimum impact energy of 31J (transverse) or 46J (longitudinal) . 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 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, offshore platforms, and marine structures operating in cold environments.

BV E550 is an extra-high-strength marine steel plate certified by Bureau Veritas (BV) with impact toughness tested at -40°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% . Impact energy requirements are 37J (transverse) or 55J (longitudinal) at -40°C . The chemical composition features carbon ≤0.20%, manganese ≤1.60-1.70%, with strict control of phosphorus and sulfur . This grade requires advanced processing and is typically supplied in normalized and tempered, or quenched and tempered (QT) conditions . It is designed for demanding structural components in shipbuilding, offshore platforms, and marine structures requiring superior strength-to-weight ratio.

Both BV E460 and BV E550 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 E550 provides a higher minimum yield strength of 550 MPa with tensile strength reaching 670-830 MPa, designed for more demanding load-bearing applications requiring superior strength. 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 superior mechanical properties while maintaining good weldability for critical marine service.

Chemical Composition

Mechanical Property