Difference between RINA E500 and RINA E620 steel plate

RINA E500 is an extra-high-strength marine steel plate certified by the Italian classification society RINA (Registro Italiano Navale) for shipbuilding and offshore applications . The "E" grade signifies it is impact tested at -40°C, ensuring excellent toughness for vessels operating in cold environments . It has a minimum yield strength of 500 MPa and tensile strength ranging from 610 to 770 MPa, with a minimum elongation of 16% for thicknesses up to 260mm . Impact energy requirements are a minimum of 33J at -40°C . The chemical composition is strictly controlled with carbon ≤0.20% and manganese ≤1.70% . This grade is widely used for offshore drilling platforms, hull structures, and FPSO vessels .

RINA E620 is an ultra-high-strength marine steel plate also certified by RINA, with impact toughness tested at -40°C requiring a minimum of 62J (longitudinal) and 41J (transverse) for thicknesses under 150mm . The "620" denotes a minimum yield strength of 620 MPa and tensile strength ranging from 720 to 890 MPa, with a minimum elongation of 15% . The chemical composition features carbon ≤0.20%, manganese ≤1.70%, and microalloying elements such as Nb, V, Ti, Cr, Ni, and Mo for enhanced properties . This grade requires advanced processing and is typically supplied in quenched and tempered (QT) or TMCP conditions . It is designed for the most demanding structural components in shipbuilding, ultra-deepwater offshore platforms, Arctic-class vessels, and FPSO units requiring maximum strength-to-weight ratio .

Both RINA E500 and RINA E620 are RINA-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 and impact energy requirements: E500 offers a minimum yield strength of 500 MPa with tensile strength of 610-770 MPa and 33J impact energy, suitable for high-strength offshore platforms and general shipbuilding , while E620 provides a substantially higher minimum yield strength of 620 MPa with tensile strength reaching 720-890 MPa and superior impact toughness of 62J, designed for the most demanding load-bearing applications requiring maximum strength-to-weight ratio . Both grades feature strictly controlled chemical composition with carbon ≤0.20% and maintain good weldability for critical marine service, though E620 requires more complex alloying and advanced processing like QT or TMCP to achieve its superior mechanical properties . The selection between them depends on whether the project requires the balanced strength of E500 or the enhanced performance of E620 for more extreme structural demands.

RINA E500 extra high Strength Chemical Composition in Tempering and Quenching

RINA E620 extra high Strength Chemical Composition in Tempering and Quenching

RINA E500 extra high strength property in Tempering and Quenching

RINA E620 extra high strength property in Tempering and Quenching