Difference between BV A and BV B steel plate

BV A and BV B are standard strength structural steel plates certified by Bureau Veritas (BV) for general shipbuilding purposes. As the most basic grades in the BV classification system, they are widely used in non-critical areas of vessels and marine structures where high impact toughness is not the primary requirement. Both grades have a minimum yield strength of 235 MPa, but their key distinction lies in their guaranteed impact toughness at room temperature.

Key Differences

The primary difference is the level of notch toughness required, which reflects the material's resistance to brittle fracture. BV A grade steel has no specific Charpy V-notch impact energy requirement at any temperature. It is suitable for ambient temperature applications in regions of the structure where stress concentrations are low. In contrast, BV B grade steel is required to pass a Charpy V-notch impact test at room temperature (typically +20°C), ensuring a minimum level of toughness. This makes BV B steel more reliable for structural components where some dynamic or impact loading is anticipated, though still not for low-temperature service. Therefore, the selection is based on the application's criticality: BV A is used for secondary, non-critical structures, while BV B is specified for primary hull structures in normal temperature service.

RINA A Normal Strength Max Chemical Composition in Hot-rolled

RINA B Normal Strength Max Chemical Composition in Hot-rolled

RINA A Normal strength property in Hot-rolled

RINA B Normal strength property in Hot-rolled