Knowledge

Differences Between DNV Grades AH36, DH36, and EH36

DNV Grade AH36/DH36/EH36 shipbuilding steel plates are all high-strength hull structural steel plates certified by Det Norske Veritas (DNV). A/D/E denote quality grades (low-temperature toughness grades; the later the letter, the higher the low-temperature impact resistance), while “36” represents a minimum yield strength of 355 MPa (36 kgf/mm²). These three grades of steel have identical strength; the key differences lie in low-temperature impact toughness, metallurgical purity, and minimum service temperature, with Grade E offering the most rigorous low-temperature service capability.