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ABS Grade A Shipbuilding Steel Plate

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As a professional Chinese supplier of ABS Grade A marine steel plates, we provide high-quality certified marine steel plates that fully comply with the stringent standards of the American Bureau of Shipping (ABS). Our ABS Grade A marine steel plates are widely used in hull construction, offshore engineering and marine equipment manufacturing, featuring stable performance and reliable quality, and have been widely recognized by the market. Whether for new shipbuilding or ship repair and maintenance, our products can meet your requirements.

Certification :
ABS Rules
Grade :
ABS Grade 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 ABS Grade A shipbuilding steel plate?

ABS Grade A steel plates are hot-rolled steel plates certified by the American Bureau of Shipping (ABS) for general-strength ship hull structures, and are also one of the most widely used basic structural materials in the shipbuilding industry.

As one of the most commonly used grades of general-strength marine steel, ABS Grade A marine steel plates are primarily used in the construction of ship hulls, bulkheads, decks, superstructures and various marine engineering structures. It should be noted that this steel plate is not suitable for critical components of large vessels where extremely high low-temperature toughness is required, nor is it suitable for vessels operating in low-temperature environments such as polar regions.

2. Key Performance Characteristics

2.1 Good overall mechanical properties

ABS Grade A shipbuilding steel plates offer moderate strength combined with excellent ductility and toughness. They possess excellent cold-forming and weldability, fully meeting the strength design requirements for conventional ship hull structures. Furthermore, they offer outstanding value for money, making them the material of choice for basic shipbuilding structures.

2.2 Impact Toughness

Impact tests must be conducted at ambient temperature (20°C). As its low-temperature toughness is limited, it is not suitable for ship structural components operating in low-temperature environments.

2.3 Weldability

ABS Grade A shipbuilding steel plates have a moderate carbon equivalent, ensuring good weldability. Conventional welding operations do not require preheating, which effectively improves construction efficiency and reduces welding costs.

Available Specifications and Dimensions

Table 1: Specifications for ABS Grade A Shipbuilding Steel Plates

Grade	ABS Grade A
Certification	ABS (American Bureau of Shipping): Rules for Building and Classing Steel Vessels
Material Category	Normal-strength structural steel for shipbuilding
Primary Applications	Construction of ship hulls, bulkheads, decks, superstructures and offshore engineering structures.
Dimensions	Thickness: 5 - 150 mm, width: 1500 - 4000 mm, length: 6000 - 18000 mm.
Delivery Conditions	Hot Rolled, Controlled Rolled, Normalized, Thermo-Mechanical Controlled Processed (TMCP).
Surface Conditions	Typically black skin, shot blasting, pickling, oiling and painting are available.
Packaging	Standard export packaging for sea transport (primarily steel strapping and moisture-proof cloth wrapping).
Country of origin	China

Chemical Composition

Table 2: Chemical Composition of ABS Grade A Shipbuilding Steel Plates (wt %)

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

Table 2-1 Carbon Equivalent (wt %)

Thickness (mm)	5 - 50	50 - 150
Typical CEV (wt %)	≤ 0.36	≤ 0.40

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

Mechanical Properties

Table 3: Mechanical Properties - Tensile test properties

Grade	Thickness, mm	Yield Strength (ReH), MPa	Tensile Strength (Rm), MPa	Elongation (A), %
ABS Grade A	≤ 50	≥ 235	400 - 520	≥ 22

Table 4: Mechanical Properties - Impact energy KV2 (Charpy V-notch Impact Test)

Grade	Thickness, mm	Temperature, ℃	Impact Energy, KV₂ / J
Grade	Thickness, mm	Temperature, ℃	Longitudinal	Transverse
ABS Grade A	≤ 50	20	-	-

Applications

1. Shipbuilding

Suitable for the hull structures of various types of vessels, including cargo ships, passenger ships, barges and small craft, encompassing core structural components such as hull plates, inner bottom plates, outer side plates, decks and bulkheads; it serves as the fundamental material for the main structure of a vessel.

2. Offshore Engineering

Used in the structural fabrication of offshore engineering facilities such as offshore oil and gas platforms, offshore wind turbines, platform pipe joints and offshore terminals, meeting the load-bearing requirements of basic structures in marine environments.

3. Ship Repair

Used to replace hull structural components that have become worn or damaged during vessel operation, enabling the timely repair of hull defects to ensure navigational safety and operational stability.

4. Other Marine Equipment

Suitable for the manufacture of marine auxiliary equipment, as well as other marine structural components with standard requirements for strength and corrosion resistance, and is suitable for a wide range of medium- and low-load marine applications.

FAQ

Q1:

What is the difference between ABS Grade A and Grade D?

Although both grades have the same strength rating, the main difference lies in the impact toughness requirements. Grade A does not typically require low-temperature impact testing, whereas Grade D must achieve the specified impact energy at -20°C (longitudinal: ≥ 27 kJ, transverse: ≥ 20 kJ).

Q2:

Do you provide ABS certification documents for your ABS shipbuilding plates?

Yes, all our ABS shipbuilding plates are certified by the American Bureau of Shipping (ABS). We will provide full certification documents and a Material Test Certificate (MTC) to ensure that our ABS steel plate products comply with international maritime industry regulations and meet the acceptance requirements for our customers’ projects.

Q3:

Can ABS shipbuilding steel plates be supplied in normalized conditions?

Yes. Depending on the thickness (typically 40 mm or more), we can supply ABS shipbuilding steel plates in either normalized (N) or thermomechanically controlled process (TMCP) conditions to improve the grain structure.

Q4:

What is the corrosion resistance of ABS Grade A? How should it be protected?

ABS Grade A is a type of carbon steel. It is not corrosion-resistant in marine environments and is prone to rusting; therefore, it must undergo anti-corrosion treatment.

Surface preparation: Sandblasting to Sa2.5

Coating: Epoxy primer + intermediate coat + topcoat

Ballast tanks: Specialised anti-corrosion coating + cathodic protection

Q5:

What precautions should be taken when welding ABS Grade A marine steel plates?

1. Selection of welding consumables: Electrodes or welding wire should be selected from marine-grade welding materials that match the strength grade of the base metal.

2. Preheating requirements: For thick plates exceeding 25 mm in thickness, it is recommended that the preheating temperature be maintained between 80–120°C.

3. Carbon equivalent control: With a carbon equivalent (CEV) ≤ 0.40%, the steel exhibits moderate susceptibility to cold cracking.

4. Welding procedure: Strictly control the heat input during welding and avoid excessive heat input per unit length.

Q6:

What is the difference between ABS Grade A, B, D and E?

The yield strength (≥235 MPa) and tensile strength of ABS Grades A, B, D and E are identical (400–520 MPa).

The key difference lies in their impact temperature:

Grade A at 20°C (room temperature), Grade B at 0°C, Grade D at –20°C and Grade E at –40°C.

Q7:

In which parts of a ship is ABS Grade A marine steel plate primarily used?

Inner compartments, bulkheads, frames, decks (non-high-stress areas), superstructures, hull plates for vessels operating in inland waterways and mild seas, and non-critical structural components (such as platforms and walkways).

Q8:

What is the minimum order quantity (MOQ) for ABS steel plates?

We accept small-volume orders, with a minimum order quantity of 50 tonnes.

Q9:

Do you offer shot blasting and primer coating?

Yes, we offer shot blasting to SA2.5 standard and high-quality shop primer coating to prevent corrosion during the manufacturing process.

Q10:

What is the difference between ABS Grade A and Grade B?

Both grades are ordinary-strength marine steels with identical yield and tensile strengths, but ABS Grade B undergoes impact testing at 0°C, whereas Grade A typically does not require a specific impact test temperature, making Grade B more suitable for colder environments or high-stress zones.