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LR Grade AH36 Shipbuilding Steel Plate - High-Strength Marine Structural Steel

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LR Grade AH36 shipbuilding steel plates are high-quality, high-strength structural steels for marine applications certified by Lloyd’s Register (LR). They feature enhanced load-bearing capacity, excellent impact toughness at 0°C (room temperature), superior weldability and formability, as well as resistance to seawater corrosion and fatigue. We offer a full range of LR-certified Grade AH36 shipbuilding steel plates in various supply conditions, including hot-rolled (HR), thermomechanically controlled process (TMCP), and normalized (N). These products are widely used in projects such as large ocean-going vessels, heavy-duty cargo ships, offshore wind power structures, offshore oil and gas platforms, and high-load offshore support facilities.

Certification :
LR Rules
Grade :
LR Grade AH36 (LR AH36)
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 AH36 shipbuilding steel plate?

LR Grade AH36 is a high-strength marine structural steel certified by Lloyd’s Register (LR) of the United Kingdom. It is widely used in the construction of high-load vessels operating in normal-temperature waters and in offshore engineering projects. This steel grade offers excellent load-bearing capacity, structural stability, consistent impact toughness at normal temperatures, and resistance to marine corrosion. With its superior comprehensive mechanical properties, it is capable of withstanding complex navigation conditions and harsh marine service environments.

Additionally, LR Grade AH36 offers good weldability and machinability, along with a high cost-performance ratio, making it a commonly used material in the construction of large bulk carriers, container ships, offshore support platforms, and key marine infrastructure projects.

2. Meaning of the Designation

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

36: Minimum yield strength: 355 MPa (≈ 36 kgf/mm²)

Available Specifications and Dimensions

Product Name	LR Grade AH36 Shipbuilding Steel Plate
Certification	LR
Grade	LR AH36
Classification	High-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), Thermo-Mechanical Controlled Processed (TMCP), Normalized (N).
Surface Conditions	Original hot-rolled scale, 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	Widely used on the main decks, sides, bottoms, longitudinal frames, and load-bearing structural components of ocean-going cargo ships, container ships, bulk carriers, and oil tankers, as well as on various types of offshore engineering vessels.
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	Nb	V	Ti	Mo	Als
LR AH36	≤ 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 %)	≤ 0.38	≤ 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 AH36	≥ 355	490 - 630	≥ 21

Charpy (V-notch) Impact Test

Grade	Thickness, mm	Temperature, ℃	Impact Energy, KV₂ / J
Grade	Thickness, mm	Temperature, ℃	Longitudinal	Transverse
LR AH36	≤ 50	0	≥ 34	≥ 24
	> 50 - 70	0	≥ 41	≥ 27
	> 70 - 150	0	≥ 50	≥ 34

Applications

1. Shipbuilding

Suitable for high-load-bearing structural components in large bulk carriers, container ships, cargo ships, ferries, yachts, and medium- to large-sized commercial vessels, including hulls, main decks, load-bearing bulkheads, keels, and longitudinal/transverse support structures.

2. Offshore Engineering

Used for core load-bearing components in offshore oil and gas platforms, offshore wind turbine foundations, and heavy-duty engineering equipment in shallow waters, including main support structures, heavy-duty deck structures, and fixed auxiliary facilities.

3. Port Equipment and Facilities

Applied to coastal heavy-duty terminals, port support facilities, and shallow-water channel infrastructure.

4. Ship Repair and Reinforcement

Used for structural replacement, high-strength reinforcement, and comprehensive safety upgrades of large, aging ocean-going vessels and offshore heavy-duty facilities.

Other Information

Product Advantages:

1. Comprehensive LR certification and global compliance

2. Stable impact toughness and fatigue resistance at room temperature

3. Excellent weldability and formability

4. Reliable resistance to marine corrosion

5. Full range of specifications and one-stop customization services

6. Stable bulk supply capacity

Service Advantages:

1. Strict quality control throughout the entire process

2. Flexible customization and value-added processing

3. Professional global export services

4. Competitive discounted prices

FAQ

Q1:

What custom processing services do you offer for LR Grade AH36 shipbuilding steel plates?

We provide 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 high-standard offshore engineering projects.

Q2:

Does your LR Grade AH36 shipbuilding steel plate support third-party inspection?

Yes. All of our LR Grade AH36 shipbuilding steel plates fully support third-party inspections by internationally recognized organizations such as SGS and BV. They come with complete official LR certification and original factory test certificates, ensuring comprehensive quality traceability.

Q3:

What is the application of LR Grade AH36 shipbuilding plate?

LR Grade AH36 shipbuilding steel plate is a high-strength hull structural steel certified by Lloyd’s Register (LR). It is primarily used in ultra-large ocean-going vessels, deep-sea offshore platforms, heavy-duty offshore engineering facilities, and high-load-bearing ship structures, and serves as a core load-bearing material for high-grade offshore engineering projects.

Q4:

Is LR Grade AH36 marine steel plate compatible with other classification society standards?

Yes. This product fully complies with the relevant marine steel standards of major classification societies such as CCS, ABS, BV, and DNV. We can provide dual or multiple classification society joint certifications based on customer requirements to meet marine engineering acceptance standards in different countries or regions.

Q5:

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.