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LR Grade A Shipbuilding Steel Plate - LR A Ordinary-Strength Marine Structural Steel

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LR Grade A shipbuilding steel plates are Lloyd’s Register (LR)-certified general-strength marine structural steel suitable for the construction of vessels operating in coastal and inland waterway environments under normal temperature conditions, offering significant cost-effectiveness advantages. We supply LR Grade A marine steel plates in a full range of specifications and provide complete LR certificates of approval and factory test certificates.

Certification :
LR Rules
Grade :
LR Grade A (LR 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 LR Grade A shipbuilding steel plate?

LR Grade A is a standard-strength shipbuilding structural steel certified by Lloyd’s Register (LR). It offers stable mechanical properties, good ductility and weldability, and reliable resistance to marine atmospheric corrosion.

This steel grade is suitable for normal-temperature marine environments and is primarily used in the construction of coastal vessels, inland waterway vessels, and general offshore structures.

We supply LR Grade A marine steel plates in a full range of specifications, including hot-rolled, thermomechanically controlled process (TMCP), and normalized products. All products strictly comply with the LR Marine Steel Specification and are accompanied by an LR Certificate of Approval and a Mill Test Certificate (MTC).

2. Meaning of the Designation

LR: Certified by Lloyd’s Register (LR)

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

Available Specifications and Dimensions

Product	LR Grade A Shipbuilding Steel Plate
Certification	LR
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), 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	primarily used in coastal and inland waterway vessels, small- and medium-tonnage vessels, offshore support facilities, coastal port infrastructure, and routine ship repair projects.
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
LR 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), %
LR A	≥ 235	400 - 520	≥ 22

Charpy (V-notch) Impact Test

Grade	Thickness, mm	Temperature, ℃	Impact Energy, KV₂ / J
Grade	Thickness, mm	Temperature, ℃	Longitudinal	Transverse
LR 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

LR Grade A shipbuilding steel plates are primarily used in traditional civilian ship structures, such as inland waterway vessels, coastal cargo ships, small- and medium-sized offshore support platforms, coastal marine infrastructure, and routine ship repair projects. They are suitable for traditional, non-extreme marine operating environments.

Typical applications include:

1. Coastal and Inland Waterway Vessels

Used in the construction of hull structures for small- to medium-tonnage coastal cargo ships, bulk carriers, passenger ships, tugboats, and inland waterway vessels.

2. Offshore Engineering Support Facilities

Used for general offshore platform support equipment, offshore pipeline supports, and structural components of floating facilities.

3. Coastal Marine Infrastructure

Used for coastal port terminals, load-bearing structures, fairway engineering facilities, flood control structures, and marine support projects.

4. Ship Repair and Refurbishment

Used for component replacement, structural reinforcement, and overall refurbishment of conventional ships and coastal marine facilities.

Other Information

Key Advantages of Our LR Grade A Shipbuilding Steel Plates

1. Official LR Classification Society certification

2. Consistent structural strength

3. Excellent weldability and workability

4. Good resistance to marine atmospheric corrosion

5. Cost-effectiveness and wide applicability

6. Full range of specifications and customization services

7. Ample capacity for bulk supply

FAQ

Q1:

What custom processing services are available for LR Grade A shipbuilding steel plates?

We offer end-to-end custom processing services, including hot rolling, normalizing, thermomechanically controlled rolling (TMCP), cutting, precision bending, shot blasting, rust removal, polishing, and custom sizing, to meet the diverse processing needs of the shipbuilding and offshore engineering sectors.

Q2:

Is LR Grade A shipbuilding steel plate compatible with the standards of other classification societies?

Yes. Our LR Grade A shipbuilding steel plate is compatible with the standards of major classification societies such as CCS, ABS, BV, and DNV. We can provide dual or multiple classification society certifications upon customer request, fully meeting the marine engineering acceptance standards of various countries and regions.

Q3:

Does your LR Grade A marine steel plate have official LR certification?

Yes. All of our LR Grade A shipbuilding steel plates hold valid official certification from Lloyd’s Register (LR), accompanied by EN 10204 3.2 Mill Test Certificates and complete qualification documentation. The full set of certificates is internationally recognized and supports global project bidding, engineering acceptance, and cross-border customs clearance.

Q4:

What are the applications of LR Grade A shipbuilding steel plates?

LR Grade A shipbuilding steel plates are LR-certified ordinary-strength marine steels primarily used in coastal and inland waterway vessels, small- and medium-tonnage vessels, offshore support facilities, coastal port infrastructure, and routine ship repair projects. They are suitable for normal marine service conditions at ambient temperatures.