Difference between RINA E and RINA D steel plate

RINA D and RINA E are categories of shipbuilding steel plates certified by the Italian classification society RINA (Registro Italiano Navale). These grades specify the required impact toughness at low temperatures, which is crucial for vessels operating in cold environments. The core distinction lies in their designated service temperature grades.

Key Differences

The primary difference is the minimum Charpy V-notch test temperature.

RINA D Grade: Requires impact testing at 0°C (32°F). This grade is suitable for general marine use in temperate climates where low-temperature brittleness is not a major concern.

RINA E Grade: Demands impact testing at -20°C (-4°F). It is designed for ships operating in colder seas, such as the North Atlantic or winter conditions in higher latitudes, providing better resistance to brittle fracture.

RINA D Normal Strength Max Chemical Composition in Hot-rolled

RINA E Normal Strength Max Chemical Composition in Hot-rolled

RINA D Normal strength property in Hot-rolled

RINA E Normal strength property in Hot-rolled

In essence, the RINA E grade offers superior low-temperature toughness compared to the D grade. The choice between them depends entirely on the lowest service temperature the vessel will encounter. For operations in icy or very cold waters, E grade is mandatory, while D grade is sufficient for most routine commercial vessels in warmer routes.