Difference between CCS EH36 and CCS EH40 steel plate

CCS EH36 is a high-strength shipbuilding steel plate certified by the China Classification Society (CCS) . The "EH" designation signifies it is a high-strength grade with impact toughness tested at -40°C . It has a minimum yield strength of 355 MPa and tensile strength ranging from 490 to 620 MPa, with a minimum elongation of 21% . The chemical composition is strictly controlled with carbon ≤0.18% and manganese 0.90-1.60%. It is typically supplied in a normalized or TMCP condition . This grade is widely used for critical hull structures, decks, and offshore platforms.

CCS EH40 is an extra-high-strength marine steel plate also certified by CCS with impact toughness tested at -40°C . The "40" denotes a minimum yield strength of 390 MPa and tensile strength ranging from 510 to 660 MPa, with a minimum elongation of 20% . Impact energy requirements at -40°C are a minimum of 41J (longitudinal) for thicknesses up to 50mm . The chemical composition is similar to EH36 with carbon ≤0.18% and manganese 0.90-1.60% . This grade is designed for demanding applications in shipbuilding and offshore structures requiring superior strength, such as in high-stress areas of large vessels.

Both CCS EH36 and CCS EH40 are CCS-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: 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 controlled chemical composition and maintain good weldability for critical marine service.

CCS EH36 high Strength Max Chemical Composition in Tempering and Quenching

CCS EH40 high Strength Max Chemical Composition in Tempering and Quenching

CCS EH36 high strength property in tempering and quenching

CCS EH40 high strength property in tempering and quenching