DNV Grade DH32 Shipbuilding Steel Plate - NV D32 High-Strength Marine Structural Steel

1. What is DNV Grade DH32 shipbuilding steel plate?

DNV Grade DH32 shipbuilding steel plate is a DNV-certified, high-strength, low-temperature-resistant structural steel for marine applications.

Developed in strict accordance with DNV’s marine engineering and shipbuilding industry standards, this low-temperature, high-strength shipbuilding steel offers excellent low-temperature toughness, superior weldability, reliable structural stability, and consistent resistance to marine corrosion. It is the material of choice for the hull structures of ocean-going vessels, offshore platforms, marine engineering equipment, and coastal engineering facilities.

All of our DNV DH32 shipbuilding steel plates have passed DNV’s rigorous factory approval and product inspection processes. We provide complete certification documentation and support third-party testing, ensuring the steel is suitable for long-term use under complex and harsh marine operating conditions.

2. Meaning of the Designation

DNV: Certified by Det Norske Veritas (DNV)

D: Quality grade D (Impact testing must be conducted at -20°C)

H: High-strength

32: Minimum yield strength: 315 MPa (≈ 32 kgf/mm²)

Chemical Composition (Heat Analysis, wt %)

Carbon Equivalent (wt %)

Calculation formula (IIW): CEV = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15

Tensile Test

Charpy (V-notch) Impact Test

1. Shipbuilding (Core Application Area)

DH32 is a typical grade of DNV-class high-strength steel suitable for cold-water navigation areas, covering the core load-bearing structures of mainstream ship types.

1.1 Main Structures of Civil and Commercial Vessels

Applicable ship types: bulk carriers, very large crude carriers (VLCCs), container ships, general cargo ships, etc.;

Typical Components: Main load-bearing structures such as side plating, main deck, double bottom, inner bottom plate, transverse and longitudinal bulkheads, and main keel;

Performance Advantages:

· In areas sensitive to low-temperature brittleness, such as the double bottom and inner bottom plate, the -20°C impact toughness of DNV DH32 effectively suppresses crack propagation, meeting the requirements for navigation in winter low-temperature waters such as the North Atlantic and North Pacific;

· Thick-gauge products used in VLCC cargo hold side structures can reduce hull weight while meeting strength specifications, in compliance with international shipbuilding codes such as IACS UR S25.

1.2 Supporting Structures for Special-Purpose Vessels

LNG Carriers: Used in auxiliary enclosure structures such as the secondary shielding layer of liquid cargo tanks; compatible with dissimilar steel welding processes and meeting the safety requirements for low-temperature structural components specified in the IGC Code;

Special-Purpose Vessels: Main structures for offshore engineering support vessels, salvage vessels, and sub-polar operation vessels, capable of withstanding operating conditions in low-temperature waters;

Repair and Refitting: Widely used in scenarios such as hull structure replacement and localized reinforcement.

2. Offshore Engineering (Key Expansion Areas)

Thanks to its excellent low-temperature toughness, resistance to laminar tearing, and resistance to marine corrosion, DNV DH32 has become a key material of choice for offshore engineering steel structures.

2.1 Offshore Oil and Gas Development Equipment

· Drilling Rigs: Used in critical load-bearing components such as masts, legs, and main decks of semi-submersible and jack-up drilling rigs.

· FPSOs (Floating Production, Storage, and Offloading Units) and Oil and Gas Processing Modules: Primary load-bearing structures designed to withstand long-term harsh operating conditions.

2.2 Subsea and Offshore Facilities

· Subsea Manifold Systems: Used in pipe joints and structural reinforcements, suitable for high-pressure, low-temperature environments;

· Offshore Wind Power: Widely used in steel structures such as monopile foundations, jacket structures, and offshore substation platforms; it is the mainstream material of choice for offshore wind power projects.

2.3 Other Offshore Engineering Equipment

Main structures of specialized offshore vessels such as work barges, offshore crane vessels, and pipe-laying vessels.

3. Other Extended Applications

Thanks to its high strength, good weldability, and environmental adaptability, DNV DH32 is also used in certain heavy-duty engineering fields, including:

· Load-bearing structures for cross-sea bridges;

· Heavy-duty port cranes;

· Large-scale hydraulic engineering steel structures and other projects with high requirements for strength and weather resistance.

Core Product Advantages

1. Fully DNV-Certified

All DNV DH32 shipbuilding steel plates hold official DNV certification and meet the acceptance requirements of shipyards and offshore engineering projects worldwide.

2. Excellent Low-Temperature Toughness

Stable impact toughness at -20°C, making it suitable for shipbuilding and offshore structures in cold-water regions.

3. Outstanding Adaptability to Marine Environments

Combining excellent low-temperature toughness, fatigue resistance, and corrosion resistance, these plates ensure long-term, reliable service under complex and harsh marine conditions.

4. Good Welding and Forming Properties

With a low rate of welding defects and ease of cutting, bending, and forming, these plates help shorten construction cycles and reduce manufacturing costs.

5. Comprehensive Range of Dimensions and Specifications

Customizable thickness, width, and length options are available to meet both standard and special specification requirements for ship hull construction.