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

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LR Grade E is a ordinary-strength shipbuilding structural steel plate certified by Lloyd’s Register (LR) that features low-temperature impact toughness down to -40°C, as well as excellent weldability, structural stability, and resistance to seawater corrosion and cold fatigue. It is widely used in polar vessels, cryogenic offshore engineering, and projects in extreme marine environments. We offer the full range of specifications, with products accompanied by official LR certification and factory test reports, and support dual or multiple certifications from major classification societies such as CCS, ABS, BV, and DNV.

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

LR Grade E shipbuilding steel plate is a ordinary-strength marine structural steel plate certified by Lloyd’s Register (LR). It has a minimum yield strength of 235 MPa and a tensile strength of 400 - 520 MPa, and has passed rigorous Charpy V-notch impact tests at –40°C —the highest low-temperature toughness standard among LR A/B/D/E ordinary-strength marine steel plates. Produced using fine-grain controlled rolling, it prevents brittle fracture under ultra-low-temperature marine conditions.

Its core properties include: excellent low-temperature toughness at -40°C, good structural stability, resistance to seawater corrosion, weldability, and formability, making it a critical material for polar vessels, ultra-low-temperature offshore platforms, and extreme marine engineering projects.

2. Grade Interpretation

LR: Certified by Lloyd’s Register (LR)

E: Quality grade E (Must meet the requirements of the impact test at -40°C)

Available Specifications and Dimensions

Product Name	LR Grade E Shipbuilding Steel Plate
Certification	LR (Supports dual or multiple certifications from major classification societies such as CCS, ABS, BV, DNV, and NK.)
Grade	LR E
Classification	Ordinary-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	Thermo-Mechanical Controlled Processed (TMCP), Normalized (N), Quenched and Tempered (Q+T).
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	Widely used in shipbuilding for polar waters and cryogenic offshore engineering projects.
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	Als
LR E	≤ 0.18	≤ 0.35	≥ 0.70	≤ 0.025	≤ 0.025	≤ 0.35	≤ 0.30	≤ 0.30	≥ 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 E	≥ 235	400 - 520	≥ 22

Charpy (V-notch) impact test

Grade	Thickness, mm	Temperature, ℃	Impact Energy, KV₂ / J
Grade	Thickness, mm	Temperature, ℃	Longitudinal	Transverse
LR E	≤ 50	- 40	≥ 27	≥ 20
	> 50 - 70	- 40	≥ 34	≥ 24
	> 70 - 150	- 40	≥ 41	≥ 27

Applications

1. Construction of Polar/Ice-Class Vessels

Core load-bearing structures for polar expedition vessels, icebreaking support vessels, high-latitude ocean-going bulk carriers, and cargo ships.

2. Cryogenic Offshore Engineering Facilities

Polar offshore platforms, deep-sea cryogenic drilling support equipment, floating offshore facilities, and support structures for cryogenic pipelines.

3. Ship Repair and Refitting

Structural renewal, thickening and reinforcement, and replacement of damaged sections for ocean-going vessels, ice-class vessels, and offshore platforms.

4. Port and Marine Infrastructure

Main structural components for large polar docks, floating docks, offshore floating cranes, offshore buoys, and temporary work platforms.

Other Information

Key Advantages of Our LR Grade E Shipbuilding Steel Plates

1. LR Official Certification

2. Impact toughness at -40°C

3. Stable structural performance at low temperatures

4. Excellent weldability and machinability

5. Suitability for extreme marine environments

6. High safety and reliability

7. Stable bulk supply capacity

8. Full range of specifications and customization services

FAQ

Q1:

What is the weldability of LR Grade E shipbuilding steel plates?

The weldability is good, and the carbon equivalent (CEV) is typically controlled at ≤ 0.40% (depending on the specific thickness).

For thicknesses of 40 mm or less, preheating is generally not required at ambient temperatures (≥0°C), but low-hydrogen electrodes must be used.

For plates thicker than 40 mm or highly constrained joints, preheating to 50°C–100°C is recommended to reduce the cooling rate and prevent cold cracks.

Important Note: Welding consumables approved by the classification society and compatible with LR Grade E must be used.

Q2:

What is the main difference between LR Grade D and Grade E marine steel?

The basic strength parameters of the two grades are the same; the key difference lies in low-temperature impact resistance and application scenarios.

LR Grade D must pass an impact test at -20°C and is suitable for conventional cold-water regions; LR Grade E must pass an impact test at -40°C and offers superior low-temperature toughness and resistance to brittle fracture, making it suitable for polar and extremely cold marine environments.

Q3:

What is the application of LR Grade E shipbuilding steel plates?

LR Grade E shipbuilding steel plate is a high-performance, ordinary-strength marine structural steel plate with exceptional impact toughness at ultra-low temperatures of -40°C. It is primarily used in polar icebreakers, polar research vessels, ultra-cold ocean-going vessels, extremely cold offshore structures, and high-end marine infrastructure requiring resistance to brittleness at extremely low temperatures. It serves as an upgraded replacement for LR Grade D shipbuilding steel plate in polar and extremely cold marine environments.