What are difference between LR EH69 and LR EH62 steel plate？

LR EH62 is an ultra-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 Arctic and cold-environment applications . It has 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 is strictly controlled with carbon ≤0.20% and manganese ≤1.70%, featuring microalloying elements including Nb, V, Ti, Cu, Cr, Ni, and Mo . This grade is designed for demanding structural components in shipbuilding, such as ultra-large container vessels and Arctic-class offshore units .

LR EH69 is also an ultra-high-strength marine steel plate certified by LR with impact toughness tested at -40°C . The "69" denotes a minimum yield strength of 690 MPa . It has a higher tensile strength ranging from 770 to 940 MPa and minimum elongation of 16% . Impact energy requirements are minimum 69J (longitudinal) or 46J (transverse) at -40°C . The chemical composition is similar to EH62 with carbon ≤0.20% and manganese ≤1.70%, but requires more stringent alloying and precise thermo-mechanical processing to achieve its superior strength . It is approved for critical applications including icebreaker hulls, offshore drilling units, and marine cranes .

Both LR EH62 and LR EH69 are LR-certified ultra-high-strength marine steels with excellent low-temperature toughness tested at -40°C, ensuring reliable performance in Arctic and harsh marine environments . Their primary difference lies in strength level: EH62 offers a minimum yield strength of 620 MPa with tensile strength of 720-890 MPa , while EH69 provides a substantially higher minimum yield strength of 690 MPa with tensile strength reaching 770-940 MPa, offering approximately 11% greater strength for maximum weight reduction in critical load-bearing applications . Both grades feature similar controlled chemical composition, but EH69 requires more advanced processing and typically demands stricter welding procedures due to its higher strength.

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