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DNV Grade D Shipbuilding Steel Plate - DNV Certified Ordinary-Strength Marine Structural Steel Plate

Q: 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.

Q: 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.

DNV Grade D Shipbuilding Steel Plate - DNV Certified Ordinary-Strength Marine Structural Steel Plate

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DNV Grade D shipbuilding steel plates are low-alloy, high-toughness structural steel plates for ship hulls with ordinary strength, certified by DNV (Det Norske Veritas). They are widely used in the global shipbuilding and offshore engineering sectors. We offer fully customizable DNV Grade D shipbuilding steel plates in all sizes, complete with comprehensive factory inspection reports, official DNV certification, and full material traceability, and we support third-party inspections.

Certification :
DNV Rules
Grade :
DNV Grade D (NV D)
Thickness :
5.0 - 150.0 mm
Width :
1500.0 - 4000.0 mm
Length :
6000.0 - 18000.0 mm

Special thickness, width, and length can be negotiated separately.
We also provide customized processing services.If you have any questions, please contact us.

Overview

1. What is DNV Grade D shipbuilding steel plate?

DNV Grade D shipbuilding steel plates are ordinary-strength, low-alloy, high-toughness structural steel plates for ship hulls certified by DNV (Det Norske Veritas); they are classified as fine-grained killed steel. It features excellent low-temperature impact resistance (≥ 27J at -20°C), stable mechanical properties (yield strength ≥ 235 MPa, tensile strength 400 - 520 MPa), excellent weldability, and resistance to marine corrosion. Widely used in shipbuilding and offshore auxiliary structure engineering in temperate and cold-water regions, it is a cost-effective structural steel plate for marine applications.

2. Meaning of the Designation

DNV: Certified by Det Norske Veritas

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

Available Specifications and Dimensions

Product	DNV Grade D Shipbuilding Steel Plate
Certification	DNV
Grade	NV D
Classification	Ordinary-Strength Structural Steel for Ship and Ocean Engineering
Thickness	5 - 150 mm
Width	1500 - 4000 mm
Length	6000 - 18000 mm
Delivery Conditions	Hot Rolled (HR), Controlled Rolled (CR), Normalized (N), Thermo-Mechanical Controlled Processed (TMCP), Quenched and Tempered (Q+T).
Surface Conditions	The surface is in its original condition; surface treatments such as sandblasting, rust removal, oiling and painting are available.
Testing	Tensile test, Charpy V-notch impact test, Ultrasonic testing (UT), Z-direction property test (Grades Z15/Z25/Z35), dimensional inspection.
Applications	For use on the hull decks, side shells, and low-to-medium stress areas of compartments on vessels operating in non-extreme cold regions; on small vessels or inland waterway vessels; and on marine auxiliary structures or hatch covers.
MOQ	5 tons (small orders can be negotiated).
Delivery Time	15 - 20 days after order confirmation (urgent orders accepted)
Packaging	Standard export packaging for sea transport, or as required.
Country of origin	China
Quality	Provide complete Mill Test Certificates (MTCs) and DNV certification, and support third-party testing by SGS, BV, and others.

Chemical Composition

Chemical Composition (Heat Analysis, wt %)

Grade	C	Si	Mn	P	S	Cu	Cr	Ni	Als
NV D	≤ 0.21	≤ 0.35	≥ 0.60	≤ 0.030	≤ 0.030	≤ 0.35	≤ 0.30	≤ 0.30	≥ 0.015

Carbon Equivalent (wt %)

Thickness (mm)	5 - 50	50 - 150
Typical CEV (wt %)	≤ 0.38	≤ 0.40

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

Mechanical Properties

Tensile test

Grade	Yield Strength (ReH), MPa	Tensile Strength (Rm), MPa	Elongation (A), %
NV D	≥ 235	400 - 520	≥ 22

Charpy (V-notch) impact test

Grade	Thickness, mm	Temperature, ℃	Impact Energy, KV₂ / J
Grade	Thickness, mm	Temperature, ℃	Longitudinal	Transverse
NV D	≤ 50	- 20	≥ 27	≥ 20
	> 50 - 70	- 20	≥ 34	≥ 24
	> 70 - 150	- 20	≥ 41	≥ 27

Applications

DNV Grade D shipbuilding steel plates are widely used in medium- and low-load structures in shipbuilding, offshore engineering, and marine support facilities, specifically including:

1. Main Ship Structure (Primary Applications)

Deck System: Main deck, superstructure deck, hatch coamings (typical applications).

Hull Plating: Side plating, bottom plating, inner bottom plating.

Bulkheads and Framing: Transverse and longitudinal bulkheads, ribs, beams, stringers, girders, and bulkhead stiffeners.

Applicable Vessel Types: Bulk carriers, oil tankers, container ships, general cargo ships, offshore engineering vessels, tugs, fishing vessels, and other mainstream commercial ships.

Operating Temperature: Suitable for waters at -20°C and above.

2. Ship Outfitting and Auxiliary Structures

Superstructure exterior walls, walkways, platforms, and handrail bases.

Marine crane bases, anchor winches, capstan bases, chafing guides, and mooring post reinforcement plates.

Internal stiffeners for cargo holds and ballast tanks, bilge wells, and bulkhead structures.

3. Offshore Engineering and Structures

Upper modules, decks, and support structures of jack-up/semi-submersible platforms.

Subsea pipelines, risers, jetties, mooring piers, and wharf structural components.

Structures in non-extremely cold regions for coastal power plants, port machinery, and offshore wind turbine foundations.

4. Ship Repair and Refitting

Hull plating replacement, deck refurbishment, bulkhead modifications, and structural reinforcement.

Life extension of older vessels, damage repair, and superstructure heightening and modifications.

Other Information

Key Product Features and Technical Advantages

1. Authoritative DNV Certification

Fully compliant with DNV shipbuilding codes, with complete certification documentation. Supports official DNV inspections and international project acceptance, making it suitable for global shipbuilding and offshore engineering tender projects.

2. Excellent Low-Temperature Toughness

Passes the -20°C low-temperature impact test, effectively reducing the risk of brittle fracture in structures operating in cold waters and harsh marine environments.

3. Excellent Workability

Features good weldability with no tendency to crack; easy to cut, bend, and form, significantly improving construction efficiency and reducing construction costs.

4. Reliable Structural Stability

Uniform steel composition with low impurity content ensures stable tensile and yield strengths. Possesses excellent resistance to seawater and marine atmospheric corrosion, effectively extending the service life of hulls, decks, and offshore auxiliary structures.

5. Wide Range of Custom Specifications

Supports customization of thickness, width, and length; offers Z-direction properties (Z15/Z25/Z35), ultrasonic testing, and special heat treatment services to meet the needs of specific projects.

Our Advantages and Service Guarantees

1. Reliable Factory Credentials

We hold DNV-certified qualifications for the production of shipbuilding steel plates, ensuring a stable supply at reasonable prices.

2. Ample Inventory and Prompt Delivery

We maintain ample stock of standard specifications and support both bulk wholesale orders and small-batch trial orders, effectively shortening the customer’s procurement cycle.

3. Full Quality Traceability

We provide complete Material Test Certificates (MTCs) and DNV certification, and support third-party inspections by SGS, BV, and others.

4. Professional Custom Processing

We offer cutting, bending, heat treatment, surface treatment, and further processing services to meet diverse engineering needs.

5. Extensive Global Export Experience

We are well-versed in international shipping and export customs clearance procedures, and maintain a stable supply to markets in Europe, Southeast Asia, the Middle East, and beyond.

FAQ

Q1:

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.

Q2:

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.

Q3:

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.

Q4:

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.

Q5:

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.