LR Marine Plate Materials
"LR standard ship plate" refers to the ship construction standard of Lloyd's Register (LR). Lloyd's Register's rules and regulations establish appropriate standards for the design, construction and life-cycle maintenance of ships, offshore installations and land-based installations.
LR A B D E steel is a hot rolled ordinary tensile strength steel. Ordinary strength LR shipbuilding steel has 3 strengths and 12 grades, and A, B, D and E grades are some of them. The yield strength of LR grade A B D E steel plate is 235 MPa and the ultimate tensile strength is 400-520 MPa.
LR MTC
The grades of LR standard shipbuilding steel plates we can provide include
|
LR Steel Plate Grade Supplier |
||||
|
General Strength |
LR/A |
LR/B |
LR/D |
LR/E |
|
High Strength |
LR/AH32 |
LR/DH32 |
LR/EH32 |
LR/FH32 |
|
LR/AH36 |
LR/DH36 |
LR/EH36 |
LR/FH36 |
|
|
LR/AH40 |
LR/DH40 |
LR/EH40 |
LR/FH40 |
|
|
Extra Strength |
LR/AH42 |
LR/DH42 |
LR/EH42 |
LR/FH42 |
|
LR/AH46 |
LR/DH46 |
LR/EH46 |
LR/FH46 |
|
|
LR/AH50 |
LR/DH50 |
LR/EH50 |
LR/FH50 |
|
|
LR/AH55 |
LR/DH55 |
LR/EH55 |
LR/FH55 |
|
|
LR/AH62 |
LR/DH62 |
LR/EH62 |
LR/FH62 |
|
|
LR/AH69 |
LR/DH69 |
LR/EH69 |
LR/FH69 |
|
LR standards marine sheet chemical composition
| Steel grade | C | Si | Mn | P | S | Als |
| Grade A | ≤0.21 | ≤0.50 | ≥2.5C | ≤0.035 | ≤0.035 | - |
| Grade B | ≤0.21 | ≤0.35 | 0.8-1.2 | ≤0.035 | ≤0.035 | - |
| Grade D | ≤0.21 | ≤0.35 | 0.6-1.2 | ≤0.035 | ≤0.035 | ≥0.015 |
| Grade E | ≤0.18 | ≤0.35 | 0.7-1.2 | ≤0.035 | ≤0.035 | ≥0.015 |
LR standards metal used in shipbuilding mechanical property
| Steel grade | Yield point/MPa | Tensile point /MPa | Elongation/% | Temperature/° C | V-type impact test | ||
| Akv/J | |||||||
| ≤50MM | 50-70MM | 70-100MM | |||||
| Grade A | 235 | 400-520 | ≥22 | 20 | - | 34/24 | 41/27 |
| Grade B | 235 | 400-520 | ≥22 | 0 | 27/20 | 34/24 | 41/27 |
| Grade D | 235 | 400-520 | ≥22 | -20 | 27/20 | 34/24 | 41/27 |
| Grade E | 235 | 400-520 | ≥22 | -40 | 27/20 | 34/24 | 41/27 |
Our services regarding LR standards Marine shipbuilding plates
1. Accurate quotation of LR standard marine slab floor to reduce procurement costs for you.
2. Timely communication allows you to monitor the entire production process and progress.
3. The superior quality of LR standard marine plates enables you to pass steel inspection and monitor finished product quality.
4. Considerable transportation can help you reduce transportation costs and let you know the transportation situation at any time.
5. Quality assurance, allowing you to get the original factory warranty as soon as possible, allowing you to smoothly carry out the next production and work plan.
6. LR Standard Ship steel plate high-quality after-sales service helps you get invoices as soon as possible and provides advice and support on billing management.
7. Tracking services and feedback from steel mills make our services more considerate.
Key Advantages of LR Marine Steel Plate
Extreme Environments and Full Lifespan Durability
The LR rules impose extremely stringent requirements for extreme operating conditions such as polar regions and deep sea, delivering maximum safety redundancy for high-risk scenarios.
Polar Icebreaking Sector: LR stipulates that vessels with Ice Class 1A Super must be equipped with double-way icebreaking capacity, and their steel plates are required to pass impact tests at -50℃, while standards including ABS generally have no such low-temperature requirements. Since 2020, 65% of Arctic LNG shipping projects have prioritized LR-certified steel plates.
Cryogenic Cargo Materials: In the LNG carrier sector, LR mandates the adoption of 9% nickel steel to withstand ultra-low temperatures of -163℃. In contrast, DNV permits alternative alloys with a nickel content of only 5%, which show relatively insufficient long-term durability.
Long-term Corrosion Protection: LR requires ballast tank coatings to withstand a minimum of 1,000 hours of ASTM B117 salt spray testing, achieving 15 years of hull protection, with durability notably improved compared to DNV's 10-year standard. Throughout the full lifecycle, vessels certified by LR can achieve a 15% enhancement in overall corrosion resistance.
Refined High-strength and Ultra-tough Material Database
For large-scale and lightweight ships and marine engineering equipment, LR offers an extensive range of high-end and rigorous strength grades.
Strength Coverage: LR-certified steel plates cover strength grades from conventional levels (yield strength of 235MPa) to ultra-high strength grades with a yield strength of 690MPa (e.g., FH69).
High-strength Steel Performance Example - LR EH46: Taking EH46, the benchmark grade of ultra-high strength and toughness marine steel, as an example, it features a yield strength of ≥460 MPa (tensile strength: 570-720 MPa), and delivers a longitudinal impact energy of up to 46 J in polar environments at -40℃. Meanwhile, its carbon equivalent is precisely controlled (C ≤ 0.20%), ensuring excellent cold bending and welding performance.
Equivalent Grades Comparison
| LR Grade | ABS Grade | ASTM Equivalent | EN Equivalent | CCS Equivalent |
|---|---|---|---|---|
| LR A | ABS A | ASTM A131 A | S235JR | CCS A |
| LR AH36 | ABS AH36 | ASTM A131 AH36 | S355 | CCS AH36 |
| LR DH36 | ABS DH36 | ASTM A131 DH36 | S355 | CCS DH36 |
| LR EH36 | ABS EH36 | ASTM A131 EH36 | S355 | CCS EH36 |
ABS A VS LR A
ABS A and LR A are both general-strength hull structural steels, with a minimum yield strength of 235 MPa and a tensile strength ranging from 400 MPa to 520 MPa. In comparison, LR A has a slightly higher upper tensile limit at 58,000 – 75,500 psi, which corresponds to 400–520 MPa. Although their conventional mechanical properties appear identical, the critical differences lie in the following three aspects, which directly influence material selection and overall project costs:
Rigour of Inspection and Acceptance
This is the most essential distinction. For Grade A applications (ambient temperature, non-toughness critical), LR certification imposes far stricter control over the internal quality of steel plates. Compared with CCS and ABS, LR surveyors are more likely to require on-site witnessed inspections and issue more detailed, stringent inspection documentation.
Target Markets (Shipowners & Shipyards)
The end market of a project determines the required classification certificate.
LR A: Serves as a standard qualification for high-end European markets - especially the UK and Commonwealth regions - premium international shipowners, cruise vessels, and Ro-Ro ships, and is widely preferred by high-end global operators.
ABS A: Remains the mainstream option for the United States, the Americas, South Korea, the Middle East, and general international cargo vessels. It is also commonly specified and accepted by Korean and American shipyards.
Comprehensive Cost & Lead Time Impac
Due to stricter certification standards and more complex approval procedures, LR A steel plates generally carry higher procurement costs than ABS A. Its delivery cycle is also more prone to delays caused by mill production scheduling and mandatory surveyor witnessing. It is recommended to verify the shipyard's existing Welding Procedure Specifications (WPS) in advance to avoid recertification requirements when switching classification societies, which would incur extra time and financial expenses.
FAQ – LR Marine Plate Materials & ABS Marine Steel Plate
What is the main practical difference between LR Grade A and ABS Grade A steel plates?
While both require a minimum yield strength of 235 MPa and tensile strength of 400–520 MPa, the key difference lies in certification rigor. LR Grade A typically demands stricter on-site witness testing by the surveyor and tighter control over batch-to-batch property variation, which provides higher reliability for critical structural applications.
What low-temperature toughness does LR Grade E guarantee?
A: LR Grade E guarantees a minimum Charpy V-notch impact energy of 27 J at -40°C, witnessed by the surveyor. This makes it suitable for structures operating in cold climates and ice waters.
For high-strength LR EH36, what tensile properties and impact temperature apply?
LR EH36 has a minimum yield of 355 MPa, tensile strength of 490–630 MPa, and requires impact testing at -40°C. The combination of high strength and low-temperature toughness is essential for large vessel hulls.
Are there specific carbon equivalent limits for LR high-strength plates to ensure weldability?
A: Yes. For grades like EH36, the carbon equivalent (Ceq) is typically controlled ≤0.38–0.40% and the cold-cracking susceptibility index (Pcm) is limited, reducing preheat requirements and avoiding hydrogen-induced cracking.
How does LR certification rigour differ from DNV for offshore-grade plates?
A: For critical applications, LR more often mandates surveyor-witnessed tensile and impact testing and full traceability, while DNV may accept mill-certified results for some standard grades. This makes LR certification a stronger quality assurance signal for end buyers.
Why Choose GNEE STEEL?
- Extensive experience in marine steel export
- Full range of LR & ABS certified plates
- Competitive factory pricing
- Strict quality control and certification support
- Custom processing services (cutting, drilling, welding)
- Reliable delivery worldwide
Conclusion
LR Marine Plate Materials and ABS Marine Steel Plate are essential for safe, durable, and high-performance marine structures. With similar mechanical properties and global acceptance, they provide flexible solutions for shipbuilding and offshore projects.
Looking for a trusted supplier of LR and ABS marine steel plates?
GNEE STEEL offers:
- Wide grade selection (A, AH32, AH36, DH36, EH36)
- Custom sizes and fast delivery
- Competitive global pricing
👉 Contact us now with your project details (grade, size, quantity) and receive a professional quotation within 24 hours!
LR standards marine steel plate product image
GNEE group team photo
GNEE group customer visit
GNEE Group participates in foreign steel exhibitions
We have enough LR Marine Plate Materials in stock, and we can also customize it according to your needs.
Relying on many first-class equipment, such as CNC Shearing machine, Press Brake machine, Straightening machine, Roll Bending machine, Flat Bar Machine, Deburring machine etc, GNEE STEEL could provide various semi-productsand extensive forming services to customers.
GNEE STEEL PROCESSING
1.CTL & SL SERVICE (141 SETS)
Currently, GNEE STEEL has imported manyadvanced CTL/SL equipment from Italy and Korea and could provide customized CTL/SL services from cold rolled stainless steel and carbon steel to hot rolled stainless steel and carbon steel as well as strips and ultra-wide sheet.
CTL FACILITIES
Max Length:16500mm
Max Width:2200mm
Max Thickness:25.4mm
Max Yield Strength:1500Mpa
SL FACILITIES
Max Width:2200mm
Max Thickness:18mm
Max slit Quantity:31
Max Yield Strength:1200Mpa
2.CUTTING SERVICE
GNEE STEEL imported lots of advanced cutting machines from Germany, Sweden, America and Japan, including plasmas cutting machine, water jet cutting machine, laser cutting machine, flame cutting machine and saw machine. In order to meet customers' diversified needs, GNEE STEEL also adopts nest working multi-cutting methods and intensive production to improve production capacity and save costs for the customers.
Laser Cutting Machine
Max Cutting Length:40,000mm
Max Width:4,600mm
Max Thickness:100mm
Flame Cutting Machine
Max Cutting Length:40,000mm
Max Width:8,000mm
Max Thickness:500mm
Plasmas Cutting Machine
Max Cutting Length:30,000mm
Max Width:5,000mm
Max Thickness:100mm
Water-jet Cutting
Max Cutting Length:12,000mm
Max Width:4,010mm
Max Thickness:250mm
3.FORMING SERVICE
Steel Plate Roll Bending
Maximum Rolling Thickness: up to 200mm
Maximum Width: 4200mm
Automatic Bending Machine-Press Brake
Max Bending Capability:3000Ton
Max Bending Length:15,000mm
Expert in Bending High-Strength & Wear-Resistant Steels
Punching Machine
Max Width:3,070mm
Max Thickness:8mm
Max Pressure:250t
BEVELING SERVICE
GNEE STEEL beveling platform has edge milling machine, edge planer, flame / plasma groove cutting machine, flame groove cutting robot, desktop chamfering machine, gantry planerand other advanced equipment to provide customers with parts prefabrication services,daily processing of V-type, Y-type, X-type and U-type grooves, and guarantee subsequent processes such as welding and assembly of products.
Milling：
Max Cutting Length:18,000mm
Max Width:4500mm
Max Thickness:120mm
Beveling:
Max Length:16,000mm
Max Thickness:80mm
MACHINING SERVICE
GNEE STEEL owns CNC Portal-type Boring and Milling machine,CNC Floor-type Boring and Milling machine, Vertical Precision 5-axis Milling Machine, Portal-type Planer, Vertical Lathe, Cylindical Grinding machine, Hydraulic Planer and CNC Lathe and could provide fine machining of large spare parts and structural parts for customers.
Gantry Type Boring & Milling Maching Center
Max Length:48000mm
Max Width:12500mm
Max Height:8000mm
Max Diameter:10500mm
Deep-hole Drilling Equipment
Max Driling Depth:1,100mm
Max Bore Diameter:φ80mm
Max Diametar:φ4,500mm
MMulti-hole Drilling Equipment
Max Length:13,000mm
Max Width:10,000mm
Max Bore Diameter:φ105mm
Max Drilling Depth:250mm
Floor Boring And Milling Machine
Max Length:24,000mm
Max Height:8,000mm
Turntable Dimensions:9x5m
Vertical Lathe
Max Height:6,000mm
Max Diametar:φ22,00mm
Automated Edge Milling Machine
The Automated Edge Milling Machine is a leading product in heavy-duty milling equipment. It is primarily used for weld groove preparation (beveling) on large-format plates made of stainless steel, carbon steel, and special steel grades. It can process plates with a maximum thickness of up to 90mm, a length of 16 meters, and a width of 4 meters.
It is equipped with dual milling units and a fully automatic milling cutter head changing system, enabling automated 4-edge beveling. Its standout feature is the profiling technology used when milling wavy plates and irregularly shaped products, which ensures absolute consistency of the groove after milling.
Utilizing specially designed milling cutter heads, it can execute highly difficult and complex groove profiles in a single pass.
Materials: Plain carbon steel, pressure vessel steel, wear-resistant steel, high-strength steel, stainless steel, nickel-based alloys, etc.
Width: 1200 - 4200 mm
Length: 5800 - 16000 mm
Thickness: 5 - 90 mm
Weight: Up to 35 tons
This edge milling machine is the world's premier automated bevel milling equipment. With its excellent structural design and advanced data algorithms, it achieves full automation from plate detection to the actual milling process, significantly improving processing efficiency while guaranteeing high precision.
- Processing Accuracy
Length accuracy: ±1mm when L < 10m; ±2mm when L > 10m;
Width accuracy: ±1mm;
Diagonal accuracy: ±2mm;
Root face accuracy (blunt edge): ±1mm for Y-grooves; +0.5mm for X-grooves.
- Processing Efficiency
The processing efficiency is more than 10 times that of conventional edge milling or edge planing equipment.
HEAT TREATMENT
Heat Treatment Furnace
Max Furnace Size:36x12x13.5m
Max Rated Temperature:1100℃
Max Loading Capacity:800t
Heat Treatment of Pressure Vessels
Heat Treatment of Mining Equipment
Heat Treatment of Tube Sheet
Heat Treatment of Pressure Vessel Head
Case : Steel Plates Supply for 100,000m³ Full Containment Ammonia Storage Tank Project
GNEE STEEL is currently participating in the procurement phase of a 100,000m³ full containment ammonia storage tank project, supplying high-quality steel plates for critical tank components. Due to the corrosive nature of ammonia and the risk of Ammonia Stress Corrosion Cracking (SCC), the project requires strict metallurgical control of materials according to EN 10028-3 standards.
One of the most important technical requirements of this project is the strict limitation of the actual Yield Strength (Re) for all NL2 grade materials. To prevent SCC risks in ammonia storage environments, the actual yield strength must not exceed 390 MPa, regardless of the nominal values specified in the standard or plate thickness ranges. This requirement places higher demands on steelmaking process control, heat treatment stability, and material testing.
Raw high-strength steel plates ready for the 100,000 m³ full containment ammonia storage tank production
Project Materials and Technical Requirements
The project mainly uses P355NL2 and P275NL2 normalized pressure vessel steel plates, which are widely applied in low-temperature storage tanks due to their excellent toughness and weldability.
Key technical specifications include:
- Material grades: P355NL2 and P275NL2 (Normalized)
- Yield strength: Standard minimum / Maximum limited to 390 MPa
- Hardness: ≤ 225 HBW in base material
- Impact testing: Charpy-V notch test at -50°C, minimum 27J
- Certification: EN 10204 3.1 certificate, with optional 3.2 certification
These strict requirements ensure that the steel plates maintain stable mechanical properties and high resistance to ammonia-induced stress corrosion during long-term operation.
Precision rolling and forming of steel plates into curved sections for the 100,000 m³ ammonia storage tank.
Project Plate Quantities and Thickness Distribution
The total steel demand for this ammonia storage tank project is several thousand tons, mainly distributed across different tank sections:
P355NL2 – Inner & Outer Tank Shell Plates
- Lower shell courses: 50 mm thickness – approx. 2,000 tons
- Middle shell courses: 25 mm thickness – approx. 1,400 tons
- Upper shell courses: 10 mm thickness – approx. 500 tons
P275NL2 – Tank Bottom Plates
- Thickness: 10–15 mm – approx. 750 tons
P275NL2 – Suspended Roof Structure
- Thickness: 5–8 mm – approx. 180 tons
S275JR – Outer Roof (Ambient Structure)
- Thickness: 10 mm – approx. 450 tons
To improve tank fabrication efficiency and reduce circumferential welds, the project also requires wide steel plates to minimize welding joints, which helps reduce the potential risk of SCC in ammonia service conditions.
Formed steel segments wrapped and racked for protection, ready for 100,000 m³ ammonia storage tank assembly.
GNEE STEEL provides high-precision steel plate rolling and cylinder fabrication solutions for tank manufacturers worldwide. Send us your plate specifications or fabrication drawings for a fast quotation.
| TYPE | GRADE | SPECIFICATIONS |
| Carbon Steel / Low Alloy Coil | Q235A/B/C/D/Q355B(Q345B)/C/D/E/SS400/SAPH400-C/ASTMA283Grade C |
0.7~2.0*1250/1500mm*C 2.3~19.5*1250/1500/1800/2000mm*C |
| Medium Heavy Plate | Q235B/Q355B(Q345B)/C/D/E | 6.0-200x150mm-4000mmxL |
| Vessel Plate |
Q245R/Q345R/HP295/SA516MGR485/SA516GR70/P355NL2/P275NL2/ S275JR//SPV490/ASTM A537 Class 1/Class 2 |
2.5-120x1500mm-3000mmxL |
| High Strength Steel |
510L/610L/700L/750L/BS600MCK4/BS700MCK2/BS700MCK4/ BS960E/BWELDY700QL2/L4/BWELDY960QL4/HG60D/70D/785D/ Q460D/Q550D/690D/690E/TQ600MCD/TQ700MCD/S700MCD/ WYS600/700/STRENX700MCE/Q490E/Q490D |
1.2-60x 1500mm-2500mmxL |
| Patterned Steel | HQ235A|B | 1.2-60x 1500mm-2500mmxL |
| Wear-resistance Steel |
NM360/400/450/500/NM300TP/400TP/450TP/ ABREX400/450/500/B-HARD450XKY/ CREUSABRO4800/8000/EH C400LE/450LE/500LE/ |
3.0-50x1250mm-3300mmxL |
| Cold Rolled Coil | DC01/RECC/REDT/SPCC/ST12 | 0.5-3.0x1250mm-1500mmxC |
| Galvanized Plate | DC51D+AZ/DC51D+Z/DX51D+Z/SGH340+Z275/Z275/Z120/S350GD+ZM275 | 0.45-3.0x1250mm-1500mmxC |
| Pickled Coil | DD11/SPHC | 2.0-6.0x1500xC |
Stainless Steel Material and Surface Specifications
| TYPE | GRADE | THICKNESS | SURFACE |
| Austenitic | 304/304H/304L/304J1 | 0.25-150mm | 2B/BA/NO.4/8K/SB/HL/NO.1 |
| Austenitic | 321 | 0.4-80mm | 2B/BA/NO.4/8K/SB/HL/NO.1 |
| Austenitic | 316/316L/317L/316Ti | 0.3-80mm | 2B/BA/NO.4/8K/SB/HL/NO.1 |
| Austenitic | 201(J1/J2/J5) | 0.35-12mm | 2B/NO.1/1D |
| Ferrite | 430 | 0.4-3.0mm | 2B/BA/NO.4/8K/SB/HL |
| Ultra Pure Ferrite | 443 | 0.4-2.0mm | 2B |
| Ultra Pure Ferrite | 436L/439/444/441 | 0.5-3.0mm | 2B/2D |
Special Steel / Nickel Base Alloy
| TYPE | GRADE | GRADE (ASTM) | GRADE (EN) | THICKNESS |
| Heat-resistant Steel | 309S | S30908 | 1.4833 | 0.5-40mm |
| Heat-resistant Steel | 310S | S31008 | 1.4845 | 0.5-40mm |
| Duplex Stainless Steel | 2101 | S32101 | 1.4162 | 1.5-50mm |
| Duplex Stainless Steel | 2304 | S32304 | 1.4362 | 3.0-50mm |
| Duplex Stainless Steel | 2205 | S32205/S31803 | 1.4462 | 0.5-60mm |
| Duplex Stainless Steel | 2507 | S32750 | 1.4410 | 1.0-60mm |
| Super Austenitic-Steel | 904L | N08904 | 1.4539 | 0.6-50mm |
| Super Austenitic-Steel | 254SMO | S31254 | 1.4547 | 0.5-50mm |
| Super Austenitic-Steel | 1.4529 | N08926 | 1.4529 | 0.5-50mm |
| Super Austenitic-Steel | AL-6XN | N08367 | 1.4478 | 0.5-50mm |
| Nickel Base Alloy | Alloy 31 | N08031 | 1.4562 | 1.0-50mm |
| Nickel Base Alloy | 800 | N08800 | 1.4876 | 0.8-50mm |
| Nickel Base Alloy | 800H | N08810 | 1.4958 | 0.8-50mm |
| Nickel Base Alloy | 800HT | N08811 | 1.4959 | 0.8-50mm |
| Nickel Base Alloy | Alloy 28 | N08028 | 1.4563 | 1.0-20mm |
| Nickel Base Alloy | Alloy 20 | N08020 | 2.4660 | 1.0-20mm |
| Nickel Base Alloy | 825 | N08825 | 2.4858 | 0.8-40mm |
| Nickel Base Alloy | C276 | N10276 | 2.4819 | 0.5-50mm |
| Nickel Base Alloy | C22 | N06022 | 2.4602 | 1.0-50mm |
| Nickel Base Alloy | 625 | N06625 | 2.4856 | 0.8-20mm |
| Nickel Base Alloy | 400 | N04400 | 2.4360 | 1.0-20mm |
| Nickel Base Alloy | 600 | N06600 | 2.4816 | 1.0-50mm |
| Nickel Base Alloy | Pure Ni 201 | N02201 | 2.4061 | 0.5-20mm |
| Titanium | TA1 | Gr.1 | Class 1 | 0.5-50mm |
| Titanium | TA2 | Gr.2 | Class 2 | 0.5-50mm |
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