Difference between LR EH36 and LR EH46 steel plate

LR EH36 is a high-strength shipbuilding steel plate certified by Lloyd's Register (LR) . The "EH" designation signifies it is an extra-high-strength grade with impact toughness tested at -40°C . It has a minimum yield strength of 355 MPa and tensile strength ranging from 490 to 620 MPa, with minimum elongation of 21% . The chemical composition features carbon ≤0.18% and manganese 0.90-1.60%, with microalloying elements such as Nb and V. This grade is widely used for hull construction, offshore platforms, and critical structural components of vessels operating in harsh marine conditions.

LR EH46 is an extra-high-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% for thicknesses up to 100mm. Impact energy requirements are minimum 46J (longitudinal) or 31J (transverse) at -40°C . The chemical composition is strictly controlled with carbon ≤0.20% and manganese ≤1.70%, featuring microalloying elements . This grade is designed for demanding structural applications in shipbuilding and offshore platforms requiring superior strength.

Both LR EH36 and LR EH46 are LR-certified 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: EH36 offers a minimum yield strength of 355 MPa with tensile strength of 490-620 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 and maintain good weldability for critical marine service.

Chemical Composition

Mechanical Property