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BV Grade DH32 Shipbuilding Steel Plate - High-Strength Marine Structural Steel

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BV Grade DH32 shipbuilding steel plates are low-temperature, high-strength marine structural steel plates certified by Bureau Veritas (BV), specifically designed for medium-load hull structures and offshore engineering projects in cold and subarctic waters. We supply BV DH32 steel plates in a full range of specifications. Each batch undergoes rigorous quality inspections throughout the entire production process, and we fully support inspections by internationally recognized third-party organizations. In addition, we offer one-stop customized value-added processing services, including precision cutting, bending, drilling, beveling, shot blasting, rust removal, and professional anti-corrosion coatings.

Certification :
BV Rules
Grade :
BV Grade DH32 (BV DH32)
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 DH32 shipbuilding steel plate?

BV Grade DH32 shipbuilding steel plate is a high-strength marine structural steel plate certified by Bureau Veritas (BV), with a minimum yield strength of 315 MPa and a tensile strength of 450 - 570 MPa. It is suitable for marine engineering environments in cold waters, areas with seasonal low temperatures, and those subject to medium-to-high loads.

This steel plate offers reliable low-temperature impact toughness at -20°C, stable structural strength, excellent weldability, formability, fatigue resistance, and resistance to seawater corrosion. It maintains stable mechanical properties under long-term alternating wave loads and erosion from cold snaps, and is widely used in ocean-going vessels and offshore engineering structures operating in cold marine environments.

2. Meaning of the Designation

BV: Certified by Bureau Veritas (BV)

D: Quality grade "D" (Impact toughness grade "D," mandatory impact test at -20°C)

H: High strength steel

32: Yield strength ≥ 315 MPa (≈ 32 kgf/mm²)

Available Specifications and Dimensions

Product Name	BV Grade DH32 Shipbuilding Steel Plate
Certification	BV
Grade	DH32
Classification	High-Strength Steel Plates for Ship Hull Structures
Thickness	5 - 150 mm
Width	1,500 - 4,000 mm
Length	6,000 - 18,000 mm
Delivery Conditions	As Rolled (AR), Control Rolled (CR), Thermo-Mechanical Controll Process (TMCP), Normalized (N), Quenched and Tempered (Q+T).
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	Nb	V	Ti	Mo	Als
BV DH32	≤ 0.18	≤ 0.50	0.90 - 1.60	≤ 0.025	≤ 0.025	≤ 0.35	≤ 0.20	≤ 0.40	0.02 - 0.05	0.05 - 0.10	≤ 0.02	≤ 0.08	≥ 0.015

Carbon Equivalent

Thickness (mm)	5 - 50	50 - 150
Typical CEV (wt %)	≤ 0.36	≤ 0.38

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 DH32	≥ 315	450 - 570	≥ 22

Impact Properties

Grade	Thickness, mm	Temperature, ℃	Impact Energy, KV₂ / J
Grade	Thickness, mm	Temperature, ℃	Longitudinal	Transverse
BV DH32	≤ 50	- 20	≥ 31	≥ 22
	> 50 - 70	- 20	≥ 38	≥ 26
	> 70 - 150	- 20	≥ 46	≥ 31

Characteristics and Advantages

1. Stable, High-Strength Load-Bearing Performance

Possesses stable, high-strength mechanical properties and can withstand static loads and dynamic, alternating wave loads in cold marine environments.

2. Excellent Low-Temperature Toughness at -20°C

Passes the -20°C Charpy V-notch impact toughness test, maintaining good structural integrity and resistance to brittle fracture in cold marine environments.

3. Excellent Low-Temperature Weldability and Formability

Low susceptibility to weld cracking, combined with excellent ductility and plasticity, significantly improves construction efficiency.

4. Enhanced Corrosion Resistance and Fatigue Resistance

Effectively resists seawater and salt spray corrosion, delaying structural corrosion, aging, and fatigue failure under long-term alternating loads.

5. Ideal Balance of Performance and Cost

While meeting high-strength load-bearing and low-temperature toughness requirements, it avoids excessive performance redundancy, achieving a reasonable balance between cost-effectiveness and safety.

Applications

1. Shipbuilding

Suitable for critical load-bearing structural components of medium- and large-sized ocean-going container ships, bulk carriers, transoceanic passenger ships, and large fishing vessels operating in cold regions, including hull plating, main decks, side plating, load-bearing bulkheads, hull beams, and bottom stiffeners.

2. Offshore Platforms and Wind Power Facilities

Used for high-load-bearing structural components in offshore drilling platforms, offshore wind turbine foundation platforms, offshore living platforms, and associated auxiliary structures in cold regions, including platform load-bearing decks, equipment bases, equipment supports, structural bracing, and fastening components.

3. Ports and Marine Infrastructure

Suitable for coastal ports and marine infrastructure in cold regions, including load-bearing structures for deep-water terminals, port fender systems, vessel mooring facilities, heavy-duty marine guardrails, steel structures for breakwaters, and support structures for coastal engineering projects.

4. Marine Machinery and Auxiliary Equipment

Key structural components for marine machinery and auxiliary equipment in cold regions, including heavy-duty crane bases, winch supports, engine room load-bearing structures, and mounting frames for offshore construction equipment.

FAQ

Q1:

What are the main differences between BV DH32 and BV EH32 marine steels?

The key differences between the two lie in their low-temperature toughness ratings and applicable scenarios:

BV DH32: Features impact toughness at -20°C and is suitable for conventional cold waters and marine engineering projects in areas with seasonal low temperatures;

BV EH32: Offers impact toughness at -40°C, with superior resistance to brittle fracture and freeze-thaw cycles, and is specifically designed for more demanding environments such as polar regions, ice-covered waters, and extremely cold offshore engineering projects.

Q2:

Does your BV Grade DH32 shipbuilding steel plate support third-party inspection?

Yes. All of our BV Grade DH32 steel plates are subject to inspection by internationally recognized third-party organizations such as SGS.

The products come with complete official BV certification and original mill test certificates (MTC), ensuring full traceability of quality throughout the entire process.

Q3:

Is BV DH32 shipbuilding steel suitable for ocean-going vessels?

Yes, it is. BV DH32 offers stable structural strength and low-temperature impact toughness at -20°C, as well as excellent resistance to fatigue brittle fracture and corrosion in cold marine environments, making it particularly suitable for ocean-going vessels operating in temperate and subarctic waters.

Q4:

What are the main differences between BV DH32 and BV DH36 marine steels?

Both have the same low-temperature impact toughness; the key differences lie in their strength grades and load-bearing capacities:

BV DH32: Minimum yield strength of 315 MPa; suitable for ships operating in cold waters and offshore engineering projects under moderate loads, offering good value for money;

BV DH36: Minimum yield strength of 355 MPa; offers higher strength and is suitable for heavy-load vessels and offshore engineering projects in cold waters.

Selection Recommendation: For applications with moderate load requirements, BV DH32 is more cost-effective; for high-load or extreme operating conditions, BV DH36 should be selected.

Q5:

What is the range of available dimensions for BV DH32 shipbuilding steel plates?

Available dimensions depend on the steel mill’s production capacity. The typical range of specifications is as follows:

Thickness: 5 - 150 mm

Width: 1,500 - 4,000 mm

Length: 6,000 - 18,000 mm

In addition, special dimensions can be customized according to the shipyard’s requirements and the approval criteria of classification societies.

Q6:

What is the key difference between BV DH32 and BV AH32 marine steels?

The key differences between the two lie in their low-temperature impact toughness and the ambient temperatures for which they are suitable.

BV AH32: Requires impact toughness at 0°C and is suitable for medium- to low-load marine structures in temperate waters above 0°C.

BV DH32: Requires impact toughness at -20°C, offers excellent resistance to brittle fracture and stable low-temperature mechanical properties, and is specifically designed for primary load-bearing structures of ships and offshore platforms in cold-temperate waters ranging from -20°C to 0°C, meeting safety standards for cold regions not covered by AH32.