DNV NV A500, NV D500, NV E500 Steel Supplier

DNV NV A500, NV D500, and NV E500 are Extra-High-Strength structural steel plates designed to meet the rigorous demands of the modern offshore industry. Certified by DNV (Det Norske Veritas), these grades offer superior load-bearing capacities for critical applications.

Featuring a minimum specified yield strength of 73 ksi (approx. 500 MPa), this series is engineered to perform under extreme mechanical stress. Combined with specified Charpy V-notch impact toughness properties, these steels are the material of choice for lightweight, high-capacity offshore structures, such as jack-up rigs and heavy-lift vessels.

Key Features

• Extra-High Yield Strength: Delivers a minimum yield strength of 500 MPa (73 ksi), allowing engineers to design thinner sections without compromising structural integrity, significantly reducing overall vessel weight.

• Extreme Environment Adaptability: Tailored impact toughness for various service temperatures (Grades A, D, E), ensuring resistance to brittle fracture in deep-sea or polar environments.

• Excellent Weldability: Despite high strength levels, advanced alloying and processing (TMCP/Q&T) ensure low Carbon Equivalents (CEV/Pcm), maintaining good weldability and crack resistance.

• Through-Thickness Ductility: Often supplied with Z-direction properties to prevent lamellar tearing in highly restrained welded joints (crucial for rack and chord assemblies).

Grade Classification & Impact Temperature

The A500, D500, and E500 grades share the same strength class but are distinguished by their impact test temperatures, suitable for different structural criticality and climate zones:

• NV A500: For general high-stress areas (Impact test typically at 0°C).

• NV D500: For primary structures or cold environments (Impact test at -20°C).

• NV E500: For critical fracture-arrest components or extreme cold (Impact test at -40°C).