Difference between LR EH42 and LR EH46 steel plate

LR EH42 is an extra-high-strength marine steel plate certified by Lloyd's Register (LR). The "EH" designation signifies it is impact tested at -40°C, ensuring excellent toughness for vessels operating in cold environments . It has a minimum yield strength of 420 MPa and tensile strength ranging from 530 to 680 MPa, with minimum elongation of 20% . The chemical composition is strictly controlled with carbon ≤0.20%, manganese ≤1.70%, and microalloying elements.

LR EH46 is a higher-strength marine steel plate also certified by Lloyd's Register (LR), with impact toughness tested at -40°C . The "46" denotes a minimum yield strength of 460 MPa and tensile strength ranging from 570 to 720 MPa, with minimum elongation of 19% . Impact energy requirements are minimum 46J (longitudinal) or 31J (transverse) at -40°C . This grade is designed for demanding structural components in shipbuilding and offshore platforms requiring superior strength.

Both LR EH42 and LR EH46 are LR-certified extra-high-strength marine steels with excellent low-temperature toughness tested at -40°C, ensuring reliable performance in harsh marine environments. Their primary difference lies in strength level: EH42 offers a minimum yield strength of 420 MPa with tensile strength of 530-680 MPa, suitable for general high-strength hull construction, while EH46 provides a higher minimum yield strength of 460 MPa with tensile strength reaching 570-720 MPa, designed for more demanding load-bearing applications requiring superior strength . Both grades feature controlled chemical composition with carbon ≤0.20% and maintain good weldability for critical marine service.

Chemical Composition

Mechanical Property