Inquiry Now

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

Q: What are the mechanical properties of BV Grade B marine steel?

Tensile PropertiesGradeYield Strength (ReH), MPaTensile Strength (Rm), MPaElongation (A), %BV B≥ 235400 - 520≥ 22Impact PropertiesGradeThickness, mmTemperature, ℃Impact Energy, KV2 / JLongitudinalTransverseBV B≤ 500≥ 27≥ 20> 50 - 700≥ 34≥ 24> 70 - 1500≥ 41≥ 27

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

info@yx-steel.com 8615837212056 Get a Quote

BV Grade B shipbuilding steel plates are general-strength marine structural steels certified by Bureau Veritas (BV) and are widely used in commercial shipbuilding, offshore support projects, port facilities, and ship structural retrofits. We supply BV Grade B steel plates in a full range of specifications, accompanied by valid official BV certification and complete factory test reports, and fully support inspections by internationally recognized third-party organizations such as SGS and BV.

Certification :
BV Rules
Grade :
BV Grade B (BV B)
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 B shipbuilding steel plate?

BV Grade B shipbuilding steel plates are general-strength marine structural steels certified by Bureau Veritas (BV). Compared to Grade A, its key enhancement lies in the addition of a room-temperature impact toughness requirement at 0°C. It offers superior resistance to dynamic loads and structural crack resistance, making it suitable for service conditions in temperate, subtropical, and slightly cold waters. It is widely used in commercial shipbuilding, offshore support projects, port facilities, and ship structural retrofitting.

BV Grade B shipbuilding steel plates offer stable mechanical properties, combined with good weldability, formability, and resistance to seawater corrosion. They strike a reasonable balance between structural safety, environmental adaptability, and cost-effectiveness, making them a commonly used, practical, and cost-effective material choice for small- and medium-sized commercial vessels, coastal engineering projects, and traditional offshore structural projects worldwide.

2. Meaning of the Designation

BV: Certified by Bureau Veritas (BV)

B: Impact toughness quality grade "B" (Must meet the requirements of the impact test at 0°C.)

Available Specifications and Dimensions

Product Name	BV Grade B Shipbuilding Steel Plate
Certification	BV
Grade	B
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), 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 B	≤ 0.21	≤ 0.35	≥ 0.80	≤ 0.035	≤ 0.035	≤ 0.35	≤ 0.30	≤ 0.30	-

Carbon Equivalent

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

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

Impact Properties

Grade	Thickness, mm	Temperature, ℃	Impact Energy, KV₂ / J
Grade	Thickness, mm	Temperature, ℃	Longitudinal	Transverse
BV B	≤ 50	0	≥ 27	≥ 20
	> 50 - 70	0	≥ 34	≥ 24
	> 70 - 150	0	≥ 41	≥ 27

Characteristics and Advantages

1. Authoritative BV Official Certification

Ensures compliance with global shipyard acceptance, offshore engineering tenders, and cross-border customs clearance, with zero compliance risk.

2. Stable Structural Strength

Features excellent structural rigidity and resistance to deformation, capable of withstanding conventional hull loads and alternating wave impacts over the long term.

3. Reliable Impact Toughness at 0°C

Effectively mitigates the risk of structural brittle fracture caused by seasonal low temperatures in temperate and subtropical waters.

4. Excellent Welding and Machinability

Compatible with mainstream shipbuilding processes, helping to improve production efficiency and reduce processing costs.

5. Stable Adaptability to Marine Environments

Offers reliable resistance to seawater and atmospheric corrosion, significantly extending the service life of vessels and offshore structures.

6. High Overall Cost-Effectiveness

Offers significant cost-effectiveness advantages in large-scale offshore projects in mild-to-cold waters.

7. Broad Application Compatibility

Complies with regional acceptance standards across different countries and regions, making it widely applicable to various cross-border conventional offshore engineering projects.

Applications

1. Civil Merchant Ship Construction

Suitable for bulk carriers, container ships, general cargo ships, passenger ships, and fishing vessels operating in temperate and subtropical waters; used for hull plating, decks, side plating, bulkheads, and conventional load-bearing members.

2. Offshore Platform Structures

Used for medium-load-bearing structures in coastal engineering facilities, conventional support platforms, port floating docks, berthing facilities, and offshore operation equipment in waters with normal temperatures; as well as for dynamic load-bearing components, equipment bases, support trusses, and functional deck components in floating facilities in slightly colder waters.

3. Offshore Equipment and Auxiliary Structures

Used for auxiliary equipment, marine components, container structural members, and load-bearing support members in conventional offshore engineering projects.

4. Ports and Coastal Facilities

Structural materials suitable for coastal wharves, port auxiliary facilities, fairway projects, and marine infrastructure projects in temperate waters and waters with minimal temperature variations.

5. Vessel Maintenance and Structural Retrofits

Suitable for the maintenance and structural upgrades of various conventional vessels operating in temperate waters, as well as port and marine facilities.

FAQ

Q1:

What are the mechanical properties of BV Grade B marine steel?

Tensile Properties

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

Impact Properties

Grade	Thickness, mm	Temperature, ℃	Impact Energy, KV₂ / J
Grade	Thickness, mm	Temperature, ℃	Longitudinal	Transverse
BV B	≤ 50	0	≥ 27	≥ 20
	> 50 - 70	0	≥ 34	≥ 24
	> 70 - 150	0	≥ 41	≥ 27

Q2:

Is BV Grade B marine steel plate easy to weld and machine?

Yes. BV Grade B marine steel plates offer excellent overall workability, moderate hardness, and a good balance of ductility and plasticity, with stable impact toughness at 0°C. This steel grade is compatible with traditional shipbuilding welding, cutting, and bending processes. It is easy to weld, produces uniform weld beads, and is resistant to weld cracks and structural deformation. No complex preheating treatment is required during construction, which effectively improves processing efficiency and reduces construction costs.

Q3:

What are the applications of BV Grade B shipbuilding steel plates?

BV Grade B is an upgraded version of standard-strength marine structural steel that meets the impact toughness requirements at 0°C. It is primarily suitable for medium-standard commercial shipbuilding, coastal offshore support facilities, and conventional offshore engineering projects with basic requirements for fatigue resistance and structural safety. It is widely used in areas such as load-bearing hull structures, main decks, critical bulkheads, auxiliary structures for offshore platforms, and port facilities in normal-temperature open-sea environments.