Difference between LR EH32 and LR EH55 steel plate

LR EH32 is a high-strength structural steel plate certified by Lloyd's Register (LR) for shipbuilding and marine applications . The "E" grade signifies it is impact tested at -40°C, with minimum impact energy of 31J (longitudinal) . It has a minimum yield strength of 315 MPa and tensile strength ranging from 440 to 590 MPa, 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 general marine components .

LR EH55 is an ultra-high-strength marine steel plate also certified by Lloyd's Register (LR) with impact toughness tested at -40°C . The "55" denotes a minimum yield strength of 550 MPa and tensile strength ranging from 670 to 830 MPa, with minimum elongation of 18% . Impact energy requirements are minimum 55J (longitudinal) or 37J (transverse) at -40°C . The chemical composition features carbon ≤0.20% and manganese ≤1.70% . This grade is designed for critical, highly stressed structural members in large vessels and demanding offshore applications.

Both LR EH32 and LR EH55 are LR-certified high-strength marine steels with excellent low-temperature toughness tested at -40°C, ensuring reliable performance in harsh marine environments . 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 , while EH55 provides a substantially higher minimum yield strength of 550 MPa with tensile strength reaching 670-830 MPa, designed for more demanding load-bearing applications requiring superior strength. Both grades feature controlled chemical composition, but EH55 typically requires more advanced processing to achieve its enhanced mechanical properties while maintaining good weldability for critical marine service.

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Mechanical Property