Difference between ABS EH36 and ABS EH40 steel plate

ABS EH36 is a high-strength marine steel plate certified by the American Bureau of Shipping (ABS) for shipbuilding and offshore applications. The "E" grade signifies it is impact tested at -40°C, ensuring excellent toughness for vessels operating in extreme cold environments such as Arctic waters . It has a minimum yield strength of 355 MPa (51 ksi) and tensile strength ranging from 490 to 620 MPa (71-90 ksi), with a minimum elongation of 22% . The chemical composition is strictly controlled with carbon ≤0.18%, manganese 0.90-1.60%, and microalloying elements such as Nb and V for grain refinement . This grade is widely used for hull structures, offshore platforms, and ice-class vessels requiring superior weldability and low-temperature performance .

ABS EH40 is a higher-strength marine steel plate also certified by ABS, manufactured through quenching and tempering or TMCP (Thermo-Mechanical Controlled Processing) processes . The "40" denotes a minimum yield strength of 390 MPa (57 ksi) and tensile strength ranging from 510 to 660 MPa (74-96 ksi), with a minimum elongation of 22% . Like EH36, it is impact tested at -40°C, with impact energy requirements of at least 25 ft-lbs (longitudinal) for standard thicknesses . Its chemical composition is similar to EH36 with carbon ≤0.18% and manganese 0.90-1.60% . This grade is designed for more demanding structural applications, including ultra-large container vessels, offshore drilling units, and critical marine structures requiring superior strength-to-weight ratio .

Both ABS EH36 and ABS EH40 are ABS-certified 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: EH36 offers a minimum yield strength of 355 MPa with tensile strength of 490-620 MPa, suitable for general high-strength hull construction, while EH40 provides a higher minimum yield strength of 390 MPa with tensile strength reaching 510-660 MPa, designed for more demanding load-bearing applications requiring superior strength . Both grades feature strictly controlled chemical composition (carbon ≤0.18%, manganese 0.90-1.60%) and are typically produced through advanced processing like TMCP to achieve their mechanical properties while maintaining good weldability for critical marine service.

Chemical Composition

Mechanical Property