Products FAQ
What is the weldability of DNV Grade E shipbuilding steel plates?
Good weldability: With a carbon equivalent (CEV) of ≤0.40%, this low-carbon, low-alloy steel is suitable for manual arc welding, submerged arc welding, and gas shielded arc welding. When welding at low temperatures, heat input must be controlled to prevent cold cracks.
What are the primary application advantages of DNV Grade E marine steel?
Its key application advantage is its excellent resistance to cryogenic brittle fracture, which addresses structural safety concerns for marine steel in extremely cold polar regions. It is an essential high-performance material for high-end icebreakers and extreme offshore engineering projects.
Can you provide official DNV certification documents?
Certainly. Every batch of our DNV Grade E shipbuilding steel plates comes with official DNV certification and a Mill Test Certificate (MTC), fully compliant with international ship inspection and offshore engineering tender standards.
Do you offer custom specifications for your DNV Grade E shipbuilding steel plates?
Yes. We offer custom manufacturing and processing for thickness, width, and length, and can provide tailored heat treatment and surface finishing services based on customer project requirements to meet specific engineering needs.
What are the standard delivery conditions for DNV Grade D shipbuilding steel plates?
Thickness ≤ 40 mm: As-rolled (AR) or controlled-rolled (CR).
Thickness > 40 mm: Normalized (N) or thermomechanically controlled process (TMCP) to enhance strength and toughness.
What is the difference between DNV Grade D and Grade E?
The key difference lies in low-temperature toughness:
DNV Grade D: Impact testing is conducted at -20°C; suitable for temperate and cold climates.
DNV Grade E: Impact testing is conducted at -40°C; suitable for vessels operating in Arctic or ice-covered waters that require exceptional cold resistance.
Do you offer custom specifications and value-added processing?
Yes, our DNV Grade D shipbuilding steel plates are available in custom thicknesses, widths, and lengths, and can undergo various heat treatment processes. We also provide value-added services such as cutting, drilling, and bending, offering a one-stop solution for marine steel procurement.
What certifications are available for your DNV Grade D shipbuilding steel plates?
Our DNV Grade D shipbuilding steel plates come with official DNV certificates, factory test certificates (MTCs), and test reports for chemical composition and mechanical properties, and meet the requirements for ship inspection and project acceptance.
What is the main difference between DNV Grade A and Grade D shipbuilding steel plates?
The main difference between the two lies in the impact test requirements.
DNV Grade A: Impact testing is not mandatory, or it may be conducted at room temperature (20°C).
DNV Grade D: A Charpy V-notch impact test must be strictly conducted at -20°C.
Therefore, Grade D is more suitable for structures that may be exposed to cold environments, as it effectively resists brittle fracture and offers higher reliability.
In shipbuilding, where is DNV Grade B steel plate primarily used?
It is primarily used for the main structures of vessels under 10,000 tons, or for secondary and non-critical structures of general strength on large vessels (such as superstructures, internal bulkheads, deck platforms, etc.). Since it is designed for operating environments above 0°C, it is well-suited for the construction of ships, barges, and certain coastal fishing vessels intended for operation in coastal, inland waterway, and temperate non-ice-bound waters.
