Difference between LR EH32 and LR EH69 steel plate

LR EH32 is a high-strength shipbuilding steel plate certified by Lloyd's Register (LR) . The "EH" designation signifies it is impact tested at -40°C. It has a minimum yield strength of 315 MPa (46 ksi) and tensile strength ranging from 440 to 590 MPa (64-83 ksi) . Minimum elongation is 22%. The chemical composition features carbon ≤0.18% and manganese 0.90-1.60% . It offers good weldability and is widely used for hull structures and general marine components .

LR EH69 is an ultra-high-strength marine steel plate also certified by LR with impact toughness tested at -40°C . The "69" denotes a minimum yield strength of 690 MPa and tensile strength ranging from 770 to 940 MPa, with minimum elongation of 16% . Impact energy requirements are minimum 69J (longitudinal) at -40°C . The chemical composition includes carbon ≤0.20% and manganese ≤1.70%, with microalloying elements . This grade is designed for the most critical load-bearing components, such as in ultra-large vessels and Arctic-class offshore units .

Both LR EH32 and LR EH69 are LR-certified steels with excellent low-temperature toughness tested at -40°C. Their primary difference lies in strength level: EH32 is a high-strength steel (315 MPa yield) suitable for general hull construction , while EH69 is an ultra-high-strength steel (690 MPa yield) designed for the most demanding load-bearing applications requiring maximum strength-to-weight ratio. Both grades feature controlled chemical composition, but EH69 requires more advanced processing like quenching and tempering to achieve its superior properties.

Chemical Composition

Mechanical Property