What are difference between LR EH46 and LR EH50 steel plate？

LR EH46 is an extra-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 vessels operating in cold environments such as Arctic waters . It has 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 such as Nb and V . This grade is widely used for hull structures, offshore platforms, and demanding marine engineering projects .

LR EH50 is an ultra-high-strength marine steel plate also certified by Lloyd's Register (LR) , with impact toughness tested at -40°C . The "50" denotes a minimum yield strength of 500 MPa and tensile strength ranging from 610 to 770 MPa, with minimum elongation of 18% for thicknesses up to 100mm . Impact energy requirements are minimum 50J (longitudinal) or 33J (transverse) at -40°C . Its chemical composition features similar strict controls with carbon ≤0.20% and manganese ≤1.70%, along with microalloying elements . This grade is designed for demanding structural components in shipbuilding, offshore platforms, and marine structures requiring superior strength-to-weight ratio .

Both LR EH46 and LR EH50 are LR-certified extra-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: EH46 offers a minimum yield strength of 460 MPa with tensile strength of 570-720 MPa, suitable for general high-strength hull construction and offshore structures , while EH50 provides a higher minimum yield strength of 500 MPa with tensile strength reaching 610-770 MPa, designed for more demanding load-bearing applications requiring superior strength . Both grades feature controlled chemical composition with carbon ≤0.20% and manganese ≤1.70%.

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Mechanical Property