KR Steel Plate For Shipbuilding
KR is a ship plate certified by Korea Classification Society. KR ship plate is suitable for manufacturing ship hull structures, docks, oil production platforms, ocean pipelines, coastal power plants, dock facilities and other structural parts in ocean, coastal and inland navigation areas.
General strength ship plating: A, B, D, E. High-strength ship plates: AH32, AH36, AH40, DH32, DH36, DH40, EH32, EH36, EH40, FH36 and ultra-high-strength ship plates DH460, EH460, EH550, EH690, etc.
Structural steel for hulls is divided into four grades: A, B, C, and D according to quality. Grade A and B steel plates are all general strength plates. There is a big difference in Mn content in chemical composition. There is no other difference in mechanical properties. Yield It is the same as the tensile strength. The difference is the experimental temperature of impact energy. Grade A is 20 degrees and grade B is 0 degrees. Obviously B level is relatively better.
The grades of KR standard ship plates we can provide include
|
KR Steel Plate Grade |
||||
|
General Strength |
R A |
R B |
R D |
R E |
|
High Strength |
R A32 |
R D32 |
R E32 |
R F32 |
|
R A36 |
R D36 |
R E36 |
R F36 |
|
|
R AH40 |
R DH40 |
R EH40 |
R F40 |
|
|
Extra Strength |
R A43 |
R D43 |
R E43 |
R F43 |
|
R A47 |
R D47 |
R E47 |
R F47 |
|
|
R A51 |
R D51 |
R E51 |
R F51 |
|
|
R A56 |
R D56 |
R E56 |
R F56 |
|
|
R A63 |
R D63 |
R E63 |
R F63 |
|
|
R A70 |
R D70 |
R E70 |
R F70 |
|
KR standards shipbuilding steel plate mechanical property
Grade |
Thickness |
Yield Strength |
Tensile Strength |
Elongation |
Impact Energy |
|
(mm) |
MPa (min) |
MPa |
% (min) |
(KV J) (min) |
|
|
20 degree |
|||||
|
KR Grade A |
4-260 |
235 |
400-520 |
22 |
Grade |
Thickness |
Yield Strength |
Tensile Strength |
Elongation |
Impact Energy |
|
(mm) |
MPa (min) |
MPa |
% (min) |
(KV J) (min) |
|
|
0 degree |
|||||
|
KR Grade B |
4-260 |
235 |
400-520 |
22 |
27J |
Grade |
Thickness |
Yield Strength |
Tensile Strength |
Elongation |
Impact Energy |
|
(mm) |
MPa (min) |
MPa |
% (min) |
(KV J) (min) |
|
|
-20 degree |
|||||
|
KR Grade D |
4-260 |
235 |
400-520 |
22 |
27J |
Grade |
Thickness |
Yield Strength |
Tensile Strength |
Elongation |
Impact Energy |
|
(mm) |
MPa (min) |
MPa |
% (min) |
(KV J) (min) |
|
|
|
|
|
|
-20 degree |
|
|
KR Grade E |
4-260 |
235 |
400-520 |
22 |
27J |
Key Benefits of Using KR Steel Plate for Shipbuilding
Exceptional Weldability for Streamlined Assembly
One of the prime benefits of our KR steel plate for shipbuilding is its optimized chemical makeup, featuring a low carbon equivalent (Ceq). This design significantly reduces the risk of cold cracking during the welding process, enabling your yard to fabricate panels, modules, and complete blocks faster and with greater safety. Welders appreciate the stable arc and minimal spatter, which reduce post-weld treatment labor and consumable costs.
GNEE's fine-grain microstructure ensures that the heat-affected zone retrains its toughness, a critical factor when producing watertight joints across extensive shell plates.
Guaranteed Low-Temperature Toughness
Shipbuilding demands steel that can absorb energy without fracturing in the most challenging cold conditions. Our KR steel plate for shipbuilding grades, particularly the E and EH series, undergo a longitudinal Charpy V-notch impact test at -40°C. This guarantees that your vessel, whether navigating Arctic routes or carrying cryogenic LNG, maintains its structural integrity.
This toughness is woven into the material through GNEE's controlled rolling and accelerated cooling processes, which refine the grain size and eliminate undesirable brittle phases that could compromise safety during stormy voyages.
Superior Corrosion Resistance and Fatigue Life
A vessel's lifecycle cost is heavily influenced by its resistance to seawater corrosion and cyclic stress fatigue. The steel chemistry in GNEE's plates, coupled with a smooth, scale-free surface finish, provides enhanced resistance to pitting and general wastage in the harsh saline environment.
Furthermore, the internal cleanliness and homogeneous mechanical properties ensure excellent fatigue crack propagation resistance, making our plates ideal for critical areas like hatch corners, engine room structures, and pounding zones that endure repetitive stress wave impacts while at sea.
Applications of KR Shipbuilding Steel Plate
Constructing the World's Largest Vessel Types
The spectrum of shipbuilding projects requiring KR steel plate for shipbuilding is vast, and GNEE is proud to supply material for them all. Our plates form the skeletons of massive 20,000+ TEU container ships, where the sheer scale demands exceptional flatness and surface quality to reduce drag and ensure proper coating adhesion. For VLCCs (Very Large Crude Carriers) and bulk carriers, our high-strength AH36 and DH36 grades provide the structural load-bearing capability that enables safe transport of ore, grain, and oil across the world's oceans. From the deepest bilge plates to the exposed weather decks, GNEE steel is the silent guardian of crew and cargo.
Specialist Offshore and Special-Purpose Vessels
Beyond conventional merchant ships, our KR steel plate for shipbuilding is utilized in technically demanding offshore projects. Floating Production Storage and Offloading (FPSO) units, which spend decades at a single location without dry-docking, rely on the extraordinary fatigue resistance of our EH36 fine-grain plates. Similarly, LNG carriers feature a complex arrangement of tanks and hulls where the lower thermal expansion stresses of our TCMP-treated plates prevent microfractures. Even naval and patrol vessels benefit from the ballistic protection and lightweight design possibilities enabled by our tightly toleranced and specially processed steel, proving that GNEE's factory capabilities cover the most demanding maritime missions.
Equivalent Grades of KR Steel Plate
| KR Grade | ASTM Equivalent | EN Equivalent | ABS Equivalent | LR Equivalent |
|---|---|---|---|---|
| KR A | ASTM A131 A | S235JR | ABS A | LR A |
| KR AH36 | ASTM A131 AH36 | S355 | ABS AH36 | LR AH36 |
| KR DH36 | ASTM A131 DH36 | S355 | ABS DH36 | LR DH36 |
| KR EH36 | ASTM A131 EH36 | S355 | ABS EH36 | LR EH36 |
FAQ – KR Steel Plate for Shipbuilding
What does KR certification mean?
KR certification ensures compliance with Korean Register standards for marine safety and quality.
Is KR steel equivalent to ABS or LR steel?
Yes, KR grades are generally equivalent to ABS and LR grades with similar mechanical properties.
What industries use KR marine steel plates?
Shipbuilding, offshore oil & gas, marine engineering, and heavy fabrication.
What thickness range is available?
Typically 6 mm to 150 mm, customizable upon request.
Do you offer third-party inspection?
Yes, including KR, ABS, LR, DNV, BV, and SGS.
What are the delivery conditions?
Hot rolled, normalized, or TMCP.
Can you provide processing services?
Yes, cutting, drilling, welding, and surface treatment.
How is corrosion resistance ensured?
Optional shot blasting and marine-grade coatings are available.
What is the minimum order quantity?
Flexible depending on stock and specifications.
Do you support global export?
Yes, with extensive export experience and logistics solutions.
What grade of steel is used in shipbuilding?
Shipbuilding steel is divided into grades and approved by international classification societies. We stock normal-strength and higher-strength shipbuilding Steel grades in grades: A, D, E, D36, E36, F36 and E40.
What is a ship plate?
Ship plates are characterized by excellent weldability and resistance to temperature fluctuations and alternating loads. You will use them for the construction of cruise and cargo ships or yachts and other vessels. It is also suitable for repairing or rebuilding boats.
Why Choose GNEE STEEL?
Professional supplier of marine-grade steel plates
- Full range of KR, ABS, LR, DNV certified materials
- Competitive pricing with stable supply
- Strict quality inspection and certification support
- Advanced processing capabilities
- Fast delivery and global shipping
Conclusion
KR Steel Plate for Shipbuilding is a reliable and high-performance material designed to meet the demanding requirements of marine and offshore industries. With excellent strength, weldability, and international equivalence, it is an ideal choice for modern shipbuilding projects.
Looking for a trusted KR steel plate supplier?
GNEE STEEL provides:
- Complete KR grade range (A, AH32, AH36, DH36, EH36)
- Custom sizes and processing services
- Competitive prices and fast delivery
👉 Send your inquiry now (grade, thickness, quantity) and get a professional quotation within 24 hours!
KR standard steel plates for shipbuilding Products image
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We have professional online service personnel. If you have any questions about KR Steel Plate For Shipbuilding, please send us an inquiry and we will reply to you within one working day.
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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