Difference between DNV E460 and DNV E690 steel plate

DNV E460 is a high-strength structural steel plate certified by DNV (Det Norske Veritas) for marine and offshore applications . 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 (67 ksi) and tensile strength ranging from 570 to 720 MPa (83-105 ksi), with minimum elongation of 17% . The chemical composition is strictly controlled with carbon ≤0.20% and manganese ≤1.70% . This grade is typically supplied in normalized, thermo-mechanical controlled processed (TMCP), or quenched and tempered (QT) conditions . It is widely used for hull construction, offshore platforms, and marine structures operating in cold environments.

DNV E690 is an ultra-high-strength marine steel plate also certified by DNV with impact toughness tested at -40°C . The "690" denotes a minimum yield strength of 690 MPa and tensile strength ranging from 770 to 940 MPa, with minimum elongation of 14% . Impact energy requirements are minimum 46J (transverse) or 69J (longitudinal) at -40°C . The chemical composition is similar to E460 with carbon ≤0.20% and manganese ≤1.70%, featuring 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, ultra-deepwater offshore platforms, and critical marine structures requiring maximum strength-to-weight ratio.

Both DNV E460 and DNV E690 are DNV-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 E690 provides a substantially higher minimum yield strength of 690 MPa with tensile strength reaching 770-940 MPa, designed for the most demanding load-bearing applications requiring maximum strength-to-weight ratio. Both grades feature controlled chemical composition with similar alloying limits, but E690 requires more advanced processing like QT or TMCP to achieve its superior mechanical properties while maintaining good weldability for critical marine service.

Chemical Composition

Mechanical Property