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BV Grade D Shipbuilding Steel Plate - Ordinary-Strength Marine Structural Steel

Q: What is the typical dimensions range for BV Grade D shipbuilding steel plates?

The range available on the market typically includes:Thickness: 5 - 150 mmWidth: 1,200 - 4,000 mmLength: 3,000 - 18,000 mmSpecific dimensions depend on the steel mill’s production capacity and order requirements.We offer one-stop value-added processing services, including precision cutting, bending, drilling, beveling, surface descaling, shot blasting, anti-corrosion coating, and heat treatment.

BV Grade D Shipbuilding Steel Plate - Ordinary-Strength Marine Structural Steel

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BV Grade D is a standard-strength marine structural steel plate certified by Bureau Veritas (BV) for use in low-temperature service environments. Compared to Grade A and Grade B, its key improvement lies in its impact toughness at -20°C, making it the preferred structural material for ocean-going vessels and offshore engineering projects in cold regions. We supply BV Grade D shipbuilding steel plates in a full range of specifications. Our products come with valid official BV certification and complete factory test reports, and we provide comprehensive support for inspections by internationally recognized third-party organizations such as SGS, BV, DNV, and ABS.

Certification :
BV Rules
Grade :
BV Grade D (BV D)
Thickness :
5.0 - 150.0 mm
Width :
1,500.0 - 4,000.0 mm
Length :
6,000.0 - 18,000.0 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 BV Grade D shipbuilding steel plate?

BV Grade D shipbuilding steel plates are general-strength, low-temperature-resistant marine structural steel plates certified by Bureau Veritas (BV). They feature stable mechanical properties, low-temperature impact toughness at -20°C, good weldability and formability, as well as resistance to seawater corrosion and fatigue.

BV Grade D shipbuilding steel plates effectively resist marine alternating loads, low-temperature embrittlement, seawater corrosion, fatigue cracking, and stress damage. They are widely used in ocean-going vessels, deep-sea offshore engineering support facilities, cold coastal port facilities, and high-standard marine structure reinforcement projects.

We also provide one-stop, customized value-added processing services, covering precision cutting, bending, drilling, beveling, shot blasting for rust removal, and anti-corrosion coating.

2. Meaning of the Designation

BV: Certified by Bureau Veritas (BV)

D: Impact toughness quality grade "D" (Impact test at -20°C)

Available Specifications and Dimensions

Product Name	BV Grade D Shipbuilding Steel Plate
Certification	BV
Grade	D
Classification	Ordinary-Strength Structural Steel for Ship Hulls
Thickness	5 - 150 mm
Width	1,500 - 4,000 mm
Length	6,000 - 18,000 mm
Delivery Conditions	Hot-Rolled (HR), Controlled Rolled (CR), Thermo-Mechanical Controlled Processed (TMCP), Normalized (N).
Surface Conditions	Original hot-rolled black scale. No cracks, scarring, delamination, inclusions, or deep scratches.
Machining Services	Precision cutting, bending, drilling, rust removal, shot blasting, anti-corrosion coating, and heat treatment.
Additional Inspection	Ultrasonic Testing (UT), Z-direction performance testing (Z15/Z25/Z35 grades), third-party inspections (e.g., SGS, BV), and multiple classification society certifications (ABS, CCS, DNV, LR, NK, etc.)
MOQ	20 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

Chemical Composition

(Heat Analysis, wt %)

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

Carbon Equivalent

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

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

Mechanical Properties

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

Impact Properties

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

Characteristics and Advantages

1. Low-Temperature Toughness at -20°C, Specifically Designed for Cold-Temperate and Ice-Covered Environments

It exhibits stable impact toughness at -20°C, meeting the low-temperature service requirements for seasonal ice-covered waters and shipping routes in cold regions.

2. Stable Comprehensive Mechanical Properties and Low-Temperature Structural Durability

It maintains stable strength, ductility, and fatigue resistance under low-temperature conditions, ensuring long-term safe structural operation.

3. Excellent low-temperature weldability and adaptability to cold-weather construction

Low susceptibility to cold cracking; compatible with mainstream welding processes; requires only conventional preheating under cold conditions, ensuring simple on-site operation.

4. Enhanced low-temperature corrosion resistance and resistance to ice fatigue

A dense microstructure effectively resists corrosion from low-temperature seawater and fatigue damage caused by ice loads, extending the structure’s service life.

5. Balance of Low-Temperature Performance and Cost-Effectiveness for Projects in Cold Regions

While meeting low-temperature safety standards, it avoids excessive performance redundancy, achieving a reasonable balance between cost and performance.

Applications

1. Construction of Ocean-Going and Cold-Region Vessels

Applicable to hull structures for ocean-going vessels and vessels operating in cold regions.

2. Offshore Platform Engineering in Cold Waters

Applicable to the main structures and ancillary structures of offshore platforms in cold waters.

3. Offshore and Port Facilities in Cold Regions

Applicable to offshore engineering projects, port infrastructure, and wharf structures in cold regions.

4. Offshore Equipment and Auxiliary Structures in Low-Temperature Regions

Used for offshore equipment and auxiliary support structures in low-temperature environments.

FAQ

Q1:

What certificates are required for the procurement and acceptance of BV Grade D marine steel plates?

The shipment must be accompanied by an EN 10204 3.2 Marine Test Certificate (MTC) signed by a BV surveyor.

The certificate must include the furnace batch number, steel plate dimensions, chemical composition, tensile properties, and impact test data at -20°C, and must bear the BV marine inspection stamp.

Q2:

What is the typical dimensions range for BV Grade D shipbuilding steel plates?

The range available on the market typically includes:

Thickness: 5 - 150 mm

Width: 1,200 - 4,000 mm

Length: 3,000 - 18,000 mm

Specific dimensions depend on the steel mill’s production capacity and order requirements.

We offer one-stop value-added processing services, including precision cutting, bending, drilling, beveling, surface descaling, shot blasting, anti-corrosion coating, and heat treatment.

Q3:

What are the heat-treated conditions for BV Grade D marine steel plates?

Common delivery conditions include hot-rolled (AR), controlled-rolled (CR), and TMCP (thermomechanical controlled process). For steel plates thicker than 40 mm, normalizing (N) is recommended to homogenize the grain structure and ensure stable low-temperature impact toughness.

Q4:

What is the applicable temperature range for BV Grade D marine steel?

BV Grade D marine structural steel is suitable for low-temperature marine environments, with a stable operating temperature range of -20°C to 25°C. It can safely withstand prolonged sub-zero freezing conditions, short-term extreme cold spells, and seasonal light ice conditions, covering cold-temperate waters at mid-to-high latitudes.

It is not suitable for polar waters where temperatures remain below -20°C for extended periods and ice conditions are severe; BV Grade E should be selected for such conditions.

Q5:

In marine engineering, can BV Grade D shipbuilding steel plates be used as a substitute for BV Grade B?

Yes. BV Grade D shipbuilding steel plates can fully replace BV Grade B shipbuilding steel plates in all temperate marine environments and offer broader applicability in cold regions.

Not only do they meet all service requirements for standard temperate marine projects, but they are also suitable for cold environments with prolonged sub-zero temperatures and light ice conditions.

Although using Grade D instead of Grade B will slightly increase material costs, it completely eliminates the risk of freezing during the cold season. It is recommended as the preferred choice for marine engineering projects in cold-temperate regions at medium to high latitudes and in seasonal ice zones.