What are difference between DNV D and DNV E steel plate？

DNV D is an ordinary-strength structural steel certified by DNV for shipbuilding and marine applications, with a minimum yield strength of 235 MPa and tensile strength of 400-520 MPa . The "D" grade signifies it is impact tested at -20°C, with minimum impact energy of 20J (transverse) or 27J (longitudinal) for thicknesses up to 50mm . The chemical composition features carbon ≤0.21%, manganese ≥0.60%, and silicon 0.10-0.35%, with aluminum ≥0.015% for grain refinement . This grade is typically supplied in normalized, TMCP, or controlled rolled conditions . It is widely used for hull structures and offshore platforms operating in cold marine environments such as the North Atlantic .

DNV E is also an ordinary-strength structural steel certified by DNV with identical minimum yield strength of 235 MPa and tensile strength of 400-520 MPa as Grade D . The "E" designation requires impact testing at the significantly lower temperature of -40°C, with minimum impact energy of 20J (transverse) or 27J (longitudinal) for thicknesses up to 50mm . The chemical composition is more strictly controlled with carbon ≤0.18% and manganese ≥0.70% to achieve superior low-temperature toughness . This grade is supplied in normalized, quenched and tempered, or TMCP conditions . It is designed for Arctic service, ice-going vessels, and structures operating in polar regions where the risk of brittle fracture is highest .

Both DNV D and DNV E are ordinary-strength marine steels with identical mechanical properties: minimum yield strength of 235 MPa and tensile strength of 400-520 MPa . Their primary difference lies in low-temperature toughness: DNV D is impact tested at -20°C, suitable for general oceangoing vessels in cold climates, while DNV E is tested at -40°C, essential for operations in severe Arctic or Antarctic conditions . To achieve this superior low-temperature performance, DNV E requires stricter chemical composition control (carbon ≤0.18% vs. ≤0.21% for D) and higher manganese content . Both grades maintain good weldability for marine service, with DNV E being the preferred choice for critical structures in extreme cold environments.

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