What are difference between LR EH32 and LR EH50 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) 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 general marine components where good weldability and low-temperature toughness are required.

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. The chemical composition features carbon ≤0.20% and manganese ≤1.70%. This grade is designed for demanding structural components in large container vessels, ice-strengthened ships, and offshore platforms requiring superior strength-to-weight ratio.

Both LR EH32 and LR EH50 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 EH50 provides a substantially higher minimum yield strength of 500 MPa with tensile strength reaching 610-770 MPa, designed for more demanding load-bearing applications requiring superior strength-to-weight ratio. Both grades feature controlled chemical composition, but EH50 typically requires more advanced processing like TMCP to achieve its enhanced mechanical properties while maintaining good weldability for critical marine service.

Chemical Composition

Mechanical Property