Difference between LR EH32 and LR EH40 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, ensuring excellent toughness for cold-environment applications such as Arctic operations . It has a minimum yield strength of 315 MPa (46 ksi) and tensile strength ranging from 440 to 570 MPa (64-83 ksi), with minimum elongation of 22% . The chemical composition is strictly controlled with carbon ≤0.18% and manganese 0.90-1.60% . This grade is widely used for hull construction, offshore platforms, and marine structures operating in cold environments.

LR EH40 is a higher-strength marine steel plate also certified by Lloyd's Register (LR) with impact toughness tested at -40°C . The "40" denotes a minimum yield strength of 390 MPa and tensile strength ranging from 510 to 650 MPa, with minimum elongation of 20% . The chemical composition features carbon ≤0.18% and manganese 0.90-1.60% . Impact energy requirements are minimum 39J (transverse) or 59J (longitudinal) at -40°C for thicknesses up to 50mm . This grade is designed for demanding structural components in shipbuilding, offshore platforms, and marine structures requiring superior strength.

Both LR EH32 and LR EH40 are LR-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: EH32 offers a minimum yield strength of 315 MPa with tensile strength of 440-570 MPa, suitable for general high-strength hull construction and offshore structures , while EH40 provides a higher minimum yield strength of 390 MPa with tensile strength reaching 510-650 MPa, designed for more demanding load-bearing applications requiring superior strength. Both grades feature controlled chemical composition with carbon ≤0.18% and require advanced processing like TMCP or normalized rolling to achieve their mechanical properties while maintaining good weldability for critical marine service.

Chemical Composition

Mechanical Property