Inquiry Now

DNV Grade A Shipbuilding Steel Plate - Certified NV A Marine Steel

Q: In what delivery conditions is DNV Grade A shipbuilding steel plate available?

Standard condition: Hot-rolled (HR).Optional conditions: Controlled Rolled (CR), normalized (N), thermo-Mechanical controlled processed (TMCP), quenched and tempered (Q+T).Value-added services: Ultrasonic testing, Z-direction property testing (Z15/Z25/Z35), shot blasting and painting according to customer requirements.

DNV Grade A Shipbuilding Steel Plate - Certified NV A Marine Steel

info@yx-steel.com 8615837212056 Get a Quote

Our DNV Grade A shipbuilding steel plates are strictly manufactured in accordance with DNV standards. They are produced using hot-rolled, controlled-rolled, normalized or TMCP processes, have passed factory inspections and obtained DNV certification, and are available for third-party inspection. These products feature stable mechanical properties, good toughness, excellent weldability, and high cost-effectiveness, and are widely used in structures such as ship hulls and offshore platforms. In addition, we offer custom sizing and fast delivery.

Certification :
DNV Rules
Grade :
DNV Grade A (NV A)
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 A shipbuilding steel plate?

DNV Grade A shipbuilding steel plates are ordinary-strength marine structural steels certified by Det Norske Veritas (DNV), suitable for hull construction, offshore engineering, and marine auxiliary structures. The products are manufactured in strict compliance with DNV ship material specifications and IACS Uniform Rules.

As the most widely used benchmark grade within the DNV ordinary-strength shipbuilding steel series (A, B, D, E), DNV Grade A steel plates feature stable mechanical properties, excellent weldability, good formability, and high cost-effectiveness. They are extensively used in general load-bearing structures such as hull decks, hull plates, and bulkheads for offshore and inland waterway vessels, as well as in various marine fittings.

2. Meaning of the Designation

NV: Certified by the Det Norske Veritas (DNV)

A: Quality grade A (No impact test required.)

Available Specifications and Dimensions

Product	DNV Grade A Shipbuilding Steel Plate
Certification	DNV
Grade	NV A
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	Commonly used for secondary structures on ships operating in temperate/moderate-temperature waters and for offshore marine engineering structures in temperate waters.
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

Chemical Composition

Chemical Composition (Heat Analysis, wt %)

Grade	C	Si	Mn	P	S	Cu	Cr	Ni	Als
NV A	≤ 0.21	≤ 0.50	≥ 0.50	≤ 0.035	≤ 0.035	≤ 0.35	≤ 0.30	≤ 0.30	-

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 A	≥ 235	400 - 520	≥ 22

Charpy (V-notch) Impact Test

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

* Where the material has undergone grain refinement treatment and is supplied in a normalised condition, impact testing may be omitted. Where the material is supplied in a TMCP condition, impact testing may be omitted subject to agreement between the supplier and the purchaser.

Applications

DNV Grade A shipbuilding steel plates are ordinary-strength structural steels for marine applications. They have no mandatory low-temperature impact requirements and are characterized by excellent weldability and high cost-effectiveness. They are suitable for use in normal-temperature and temperate waters and are commonly used in secondary ship structures and offshore marine engineering structures in normal-temperature environments. They are not suitable for use in cold-water regions or in critical areas subject to high impact loads.

1. Shipbuilding

Suitable for superstructures, secondary hull plates, internal structures, deck fittings, and ship repairs on inland river barges, coastal bulk carriers, coastal oil tankers, general-purpose container ships, tugs, engineering support vessels, and small-to-medium-sized offshore general cargo ships (excluding ice-class vessels).

2. Offshore Engineering Equipment

Nearshore fixed platforms at ambient temperatures: platform walkways, auxiliary rooms and compartments, pipe racks, non-load-bearing mezzanine panels, platform gangway decking, etc.

FPSO/FPU floating units: superstructures in living quarters, secondary mezzanines, pipe supports, etc.

3. Offshore Auxiliary Equipment

Suitable for the manufacture of ship auxiliary equipment, offshore engineering container structures, and port and offshore facilities.

FAQ

Q1:

Is DNV Grade A shipbuilding steel plate safe for use at low temperatures?

No, it is not safe. DNV Grade A shipbuilding steel plate is not required to undergo Charpy V-notch impact testing, so its low-temperature toughness cannot be guaranteed, and there is a risk of brittle fracture. This steel is not suitable for low-temperature environments; if service at low temperatures is required, DNV Grade D (-20°C) or Grade E (-40°C) should be selected.

Q2:

Do you provide mill test certificate for DNV Grade A shipbuilding steel plates?

Yes. Our DNV Grade A (NV A) shipbuilding steel plates are shipped with DNV-certified mill test tertificate. Third-party inspection reports (such as SGS or BV) can also be provided upon request.

Q3:

What are the weldability characteristics of DNV Grade A shipbuilding steel plates?

Yes. This steel grade has a low carbon equivalent (CEV ≤ 0.40%), resulting in excellent weldability. Thin plates can be welded using conventional MMA/MIG welding without preheating; for plates thicker than 50 mm, low-temperature preheating is recommended to prevent cold cracking.

Q4:

Where is DNV Grade A shipbuilding plate typically used?

Non-critical components in cargo ships, barges, and coastal vessels, including secondary hull sections, decks, bulkheads, and superstructures; as well as in offshore platforms, ship repair projects, and inland waterway vessel construction.

Q5:

In what delivery conditions is DNV Grade A shipbuilding steel plate available?

Standard condition: Hot-rolled (HR).

Optional conditions: Controlled Rolled (CR), normalized (N), thermo-Mechanical controlled processed (TMCP), quenched and tempered (Q+T).

Value-added services: Ultrasonic testing, Z-direction property testing (Z15/Z25/Z35), shot blasting and painting according to customer requirements.

Q6:

Do you offer custom processing for DNV Grade A shipbuilding steel plates?

Yes. We provide value-added services such as custom sizing, cutting, bending, heat treatment, and surface treatment based on our customers’ project requirements.