Overview
LR EH42 is an extra-high-strength marine steel plate certified by Lloyd's Register. The EH designation signifies impact testing at minus 40 degrees C, ensuring excellent toughness for vessels operating in cold environments. LR EH55 is an ultra-high-strength marine steel plate also certified by LR with impact toughness tested at minus 40 degrees C, designed for the most demanding structural components in large vessels, offshore platforms, and ice-strengthened ships.
Mechanical Properties
LR EH42 has a minimum yield strength of 420 MPa, tensile strength of 530 to 680 MPa, and minimum elongation of 20 percent, with impact energy of 28 J transverse and 42 J longitudinal at minus 40 degrees C. LR EH55 has a minimum yield strength of 550 MPa, tensile strength of 670 to 830 MPa, and minimum elongation of 18 percent, with impact energy of 37 J transverse and 55 J longitudinal at minus 40 degrees C.
Chemical Composition
Both grades limit carbon to 0.20 percent, silicon to 0.55 percent, manganese to 1.70 percent, phosphorus and sulfur to 0.030 percent, with microalloying niobium, vanadium, and titanium.
Applications
EH42 is widely used for hull structures, offshore platforms, and demanding marine components requiring good weldability. EH55 is designed for the most demanding structural components in large vessels, offshore platforms, and ice-strengthened ships requiring superior strength-to-weight ratio.
Selection Guidance
Choose EH42 for general high-strength hull construction and offshore structures in cold service. Choose EH55 where maximum strength per unit weight is required in the most demanding ice-class applications.
Frequently Asked Questions
Q: What is the yield strength of LR EH42?
A: 420 MPa minimum, with tensile strength of 530 to 680 MPa and 20 percent elongation.
Q: What is the yield strength of LR EH55?
A: 550 MPa minimum, with tensile strength of 670 to 830 MPa and 18 percent elongation.
Q: What impact temperature applies?
A: Minus 40 degrees C for both grades, for cold-environment vessels.
Q: Where is EH55 used?
A: In large vessels, offshore platforms, and ice-strengthened ships.
Q: What is the impact energy of EH42?
A: 28 J transverse and 42 J longitudinal at minus 40 degrees C.
Q: What is the sulfur limit?
A: 0.030 percent maximum for both grades.
For LR EH42 and EH55 certified marine steel plate quotations, contact our sales team.
