Difference between LR EH32 and LR EH62 steel plate

LR EH32 is a high-strength shipbuilding steel plate certified by Lloyd's Register (LR) . The "E" grade signifies it is impact tested at -40°C, with minimum impact energy of 31J (longitudinal) for thicknesses up to 50mm . It has a minimum yield strength of 315 MPa (46 ksi) and tensile strength ranging from 440 to 590 MPa (64-83 ksi), with minimum elongation of 22% . The chemical composition features carbon ≤0.18% and manganese 0.90-1.60% . This grade is widely used for hull structures, offshore platforms, and marine components requiring good weldability and low-temperature toughness.

LR EH62 is an ultra-high-strength marine steel plate also certified by Lloyd's Register (LR) with impact toughness tested at -40°C . The "62" denotes a minimum yield strength of 620 MPa and tensile strength ranging from 720 to 890 MPa, with minimum elongation of 17% for thicknesses up to 100mm . Impact energy requirements are minimum 62J (longitudinal) or 41J (transverse) at -40°C . The chemical composition features carbon ≤0.20%, manganese ≤1.70%, with microalloying elements including Nb, V, Ti, Cu, Cr, Ni, and Mo . This grade requires advanced processing like TMCP or quenching and tempering and is designed for the most critically stressed structural components in modern shipbuilding and offshore engineering, offering an exceptional strength-to-weight ratio.

Both LR EH32 and LR EH62 are LR-certified 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 440-590 MPa, suitable for general high-strength hull construction and secondary structures, while EH62 provides a substantially higher minimum yield strength of 620 MPa with tensile strength reaching 720-890 MPa, designed for the most demanding load-bearing applications requiring maximum weight reduction . Both grades feature controlled chemical composition, but EH62 requires more advanced processing like TMCP or QT to achieve its superior mechanical properties while maintaining good weldability for critical marine service.

Chemical Composition

Mechanical Property