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LR Grade AH32 Shipbuilding Steel Plate - High-Strength Marine Structural Steel

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LR Grade AH32 is a high-strength hull structural steel certified by Lloyd’s Register (LR), specifically designed for mainstream ocean-going shipbuilding and general offshore engineering projects. It offers excellent overall performance, featuring stable high load-bearing capacity, good low-temperature impact toughness, outstanding weldability, and reliable resistance to seawater corrosion. We supply LR Grade AH32 steel plates in a full range of specifications, accompanied by complete original LR certification certificates and official mill test reports. Upon request, we can also provide dual or multiple certifications from major classification societies such as CCS, ABS, BV, and DNV.

Certification :
LR Rules
Grade :
LR Grade AH32 (LR AH32)
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 LR Grade AH32 shipbuilding steel plate?

LR Grade AH32 is a 315 MPa-grade high-strength hot-rolled structural steel plate for marine applications certified by Lloyd’s Register (LR). It complies with the LR Specification for Shipbuilding Steels and is an internationally recognized, classification society-certified low-alloy high-strength hull structural steel.

It features excellent overall mechanical properties, consistent impact toughness at room temperature, consistent corrosion resistance, and outstanding weldability, and is specifically designed for use in ships, offshore platforms, and marine structures.

2. Grade Interpretation

LR: Certified by Lloyd’s Register (LR)

A: Quality grade A (Must meet the requirements of the impact test at 0°C)

H: High strength

32: Minimum yield strength: 315 MPa (≈ 32 kgf/mm²)

Available Specifications and Dimensions

Product Name	LR Grade AH32 Shipbuilding Steel Plate
Certification	LR (Supports dual or multiple certifications from major classification societies such as CCS, ABS, BV, DNV, and NK.)
Grade	LR AH32
Classification	High-Strength Structural Steel for Ship and Ocean Engineering
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 black oxide layer, No cracks, scarring, delamination, inclusions, or deep scratches.
Machining Services	Precision cutting, bending, drilling, beveling, surface rust removal, shot blasting, anti-corrosion coating, and customized secondary processing.
Inspection	Charpy V-notch impact test, Ultrasonic testing (UT), Z-direction property test (Grades Z15/Z25/Z35), Third-party test (such as SGS, BV), etc.
Applications	Primarily used in the construction of ships and offshore structures in warm waters.
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

Chemical Composition (Heat Analysis, wt %)

Grade	C	Si	Mn	P	S	Cu	Cr	Ni	Nb	V	Ti	Mo	Als
LR AH32	≤ 0.18	≤ 0.50	0.90 - 1.60	≤ 0.030	≤ 0.030	≤ 0.35	≤ 0.20	≤ 0.40	0.02 - 0.05	0.05 - 0.10	≤ 0.02	≤ 0.08	≥ 0.015

Carbon Equivalent (wt %)

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

Tensile Test

Grade	Yield Strength (ReH), MPa	Tensile Strength (Rm), MPa	Elongation (A), %
LR AH32	≥ 315	450 - 570	≥ 22

Charpy (V-notch) Impact Test

Grade	Thickness, mm	Temperature, ℃	Impact Energy, KV₂ / J
Grade	Thickness, mm	Temperature, ℃	Longitudinal	Transverse
LR AH32	≤ 50	0	≥ 31	≥ 22
	> 50 - 70	0	≥ 38	≥ 26
	> 70 - 150	0	≥ 46	≥ 31

Applications

1. Shipbuilding

1.1 Applicable Ship Types

Bulk carriers, container ships, small- and medium-sized oil tankers, general cargo ships, coastal dry cargo ships, and large inland cargo ships;

ferries, small- and medium-sized ro-ro passenger ships, yachts, work tugs, supply vessels, fishery patrol vessels, and deep-sea fishing vessels;

small-to-medium-sized ocean-going vessels up to 10,000 metric tons, and the full range of coastal, nearshore, and inland waterway vessels.

1.2 Specific Structural Components of the Hull

Load-bearing structure of the main hull: bottom plates, outer side plating, fore and aft shell plates, keel, frames, side frames, and bottom stringers;

Compartment Partitions: Watertight/non-watertight bulkheads, longitudinal bulkheads, transverse bulkheads;

Deck Areas: Main deck, superstructure deck, hatch coamings, deck stiffeners;

Superstructure: Wheelhouse, crew quarters, engine room canopy, funnel casings, and other non-extreme-cold exposed structures;

Auxiliary Reinforcements: Braces, supports, bases, cable passage reinforcement plates, lifting lug structures, and mooring reinforcement zones.

2. Offshore Engineering Platforms

Fixed Oil/Gas Production Platforms: Platform decks, lower support frames, walkways, equipment bases, pipeline supports, and auxiliary plates for non-cryogenic zone cylinders;

Floating Production, Storage, and Offloading (FPSO) units, semi-submersible support platforms, and offshore drilling support modules;

Offshore Wind Power Support Structures: Jack-up platform topsides, wind turbine access walkways, substation platform structural components;

Platform Auxiliary Structures: Boarding ramps, fender structures, storage tank side panels, seawater treatment equipment bases.

3. Vessel Maintenance

Plate Replacement and Repair for Aging Vessels: Repair and replacement of hulls, decks, bulkheads, and other components.

4. Port Infrastructure

Barge hulls, floating docks, floating crane hulls, bases for heavy port machinery, and main structures of port crane vessels, etc.

Other Information

Key Advantages

1. Authoritative, comprehensive LR certification and global validity

2. Consistent high-strength performance

3. Excellent weldability and formability

4. Reliable adaptability to marine environments

5. Consistent and stable quality

6. Stable bulk supply capacity

7. One-stop, high-precision secondary processing

8. Cost-effective discounted pricing

FAQ

Q1:

What is the main difference between LR Grade AH32 and LR Grade AH36 shipbuilding steel plates?

Both are high-strength hull structural steels certified by Lloyd’s Register (LR). The key difference lies in their yield strength grades: LR AH32 has a minimum yield strength of 315 MPa, while LR AH36 has a minimum yield strength of 355 MPa.

Therefore, LR AH32 is suitable for conventional-tonnage vessels and general offshore engineering projects, offering better cost-effectiveness; LR AH36, on the other hand, is intended for applications requiring higher strength, such as ultra-large vessels and high-load-bearing offshore structures.

Q2:

Does your LR Grade AH32 shipbuilding steel plate support third-party inspection?

Yes. All of our LR Grade AH32 shipbuilding steel plates support inspections by internationally recognized third-party organizations such as SGS, BV, and DNV. They come with complete official LR certification and original mill test certificates, ensuring full quality traceability.

Q3:

What processing services can you provide for LR Grade AH32 shipbuilding steel plates?

We offer one-stop value-added processing services, including precision cutting, bending, drilling, beveling, surface derusting, shot blasting, anti-corrosion treatment, and heat treatment, to meet all custom manufacturing and installation requirements for offshore engineering projects.

Q4:

Does LR Grade AH32 shipbuilding steel plate require special welding procedures?

LR Grade AH32 shipbuilding steel plate offers excellent overall weldability, stable material properties, and a low carbon equivalent. It is suitable for all conventional shipbuilding welding processes and does not require complex preheating or special protective measures.

Standard marine welding operating procedures ensure consistent weld quality, effectively reduce construction difficulties, and improve project efficiency.

Q5:

What is the application of LR Grade AH32 shipbuilding steel plate?

LR Grade AH32 shipbuilding steel plate is primarily used in the construction of commercial vessels, conventional offshore platforms, coastal marine infrastructure, and the maintenance of marine equipment. It is suitable for various marine engineering applications that require high strength and stable overall structural performance.