Overview
RINA E500 is an extra-high-strength marine steel plate certified by the Italian classification society RINA for shipbuilding and offshore applications. The E grade signifies impact testing at minus 40 degrees C, ensuring excellent toughness for vessels operating in cold environments. RINA E550 is an ultra-high-strength marine steel plate also certified by RINA with impact toughness tested at minus 40 degrees C, designed for demanding structural components in shipbuilding, offshore platforms, and Arctic-class vessels.
Mechanical Properties
RINA E500 has a minimum yield strength of 500 MPa, tensile strength of 610 to 770 MPa, minimum elongation of 16 percent, and minimum impact energy of 33 J at minus 40 degrees C, in thicknesses from 8 to 260 mm. RINA E550 has a minimum yield strength of 550 MPa, tensile strength of 670 to 830 MPa, minimum elongation of 16 percent, and minimum impact energy of 37 J at minus 40 degrees C.
Chemical Composition
Both grades limit carbon to 0.20 percent, manganese to 1.70 percent, silicon to 0.10 to 0.55 percent, phosphorus and sulfur to 0.030 percent, with nickel to 0.40 percent, molybdenum to 0.08 percent, copper to 0.35 percent, and microalloying niobium and vanadium. Both are typically supplied in the quenching and tempering condition.
Applications
E500 is suitable for offshore drilling platforms, hull structures, and FPSO vessels requiring balanced strength. E550 is designed for more demanding load-bearing applications requiring a superior strength-to-weight ratio, such as Arctic-class vessels and heavily loaded offshore components.
Selection Guidance
Choose E500 where balanced strength and cost matter for high-strength offshore platforms and general shipbuilding. Choose E550 where the design requires maximum strength per unit weight and the higher processing precision of the enhanced grade is justified.
Frequently Asked Questions
Q: What is the yield strength of RINA E500?
A: 500 MPa minimum, with tensile strength of 610 to 770 MPa and 16 percent elongation.
Q: What is the yield strength of RINA E550?
A: 550 MPa minimum, with tensile strength of 670 to 830 MPa and 16 percent elongation.
Q: What impact temperature applies?
A: Minus 40 degrees C, with 33 J for E500 and 37 J minimum energy.
Q: What is the maximum thickness?
A: 260 mm for both grades in the quenched and tempered condition.
Q: Where is E550 used?
A: In Arctic-class vessels and demanding offshore components requiring maximum strength-to-weight ratio.
Q: What processing is required?
A: Quenching and tempering, with precise control for the higher strength grade.
For RINA E500 and E550 certified marine steel plate quotations, contact our sales team.
