Shipbuilding Plates

Shipbuilding Plates

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Shipbuilding steel plate refers to the carbon and alloy steel plate used in offshore and marine contructions, common grades are A, B, D, E, AH32/36/40, DH32/36/40, and EH32/36/40 which ranged from different strength.

 

The plates usually used to manufacture ship hulls, bulkheads, upper decks and hatch covers for tankers, bulk carriers, container ships and LNG carriers.

ship plate mTC

 

 

Steel Plate For Shipbuilding

Steel shipbuilding plates are used in the cabin structures of cruise ships. The especially thin but wide plates are used for such applications to offer the best processing properties such as flatness and weldability. In contrast, high-strength, thermomechanically rolled shipbuilding plates are used in offshore applications. They are used for platform superstructures or for special ships in the oil and gas industry.

 

Shipbuilding steel refers to steel commonly used for shipbuilding. In fact, shipbuilding is the area where steel plates are most extensively used. Shipbuilding steel requires a wide variety of features in terms of strength, dimension, surface, form and impact toughness (represented as grade A to F) depending on the application. All of our steel plates, including regular steel and high tensile steel approved by classification societies of many countries as well as TMCP-manufactured high tensile steel that allows for highly efficient electro-gas arc welding, are used for shipbuilding. [Classification Societies] Korean Register of Shipping (KR), ClassNK, ABS, LR, DNV GL, RINA, BV, CCS, RS.

 

Shipbuiding Standards from Different Countries

Shipbuilding steel plates are produced under the approval of production methods of classification societies in different countries refers to offshore and marine steels.

• ABS (American Bureau of Shipping)
• BV (Bureau Veritas)
• CCS (China Classification Society)
• DNV (Det Norske Veritas)
• GL (Germanischer Lloyd)
• HR (Hellenic Register of Shipping)
• KR (Korean Register of Shipping)
• LR ​(Lloyd's Register of Shipping)
• NK (Nippon Kaiji Kyokai)
• RINA (Registro Italiano Navale)
• RS (India Register of Shipping)

 

 

ABS Steel Plate Grade
General Strength	AB/A	AB/B	AB/D	AB/E
High Strength	AB/AH32	AB/DH32	AB/EH32	AB/FH32
	AB/AH36	AB/DH36	AB/EH36	AB/FH36
	AB/AH40	AB/DH40	AB/EH40	AB/FH40
Extra Strength	AB/AQ43	AB/DQ43	AB/EQ43	AB/FQ43
	AB/AQ47	AB/DQ47	AB/EQ47	AB/FQ47
	AB/AQ51	AB/DQ51	AB/EQ51	AB/FQ51
	AB/AQ56	AB/DQ56	AB/EQ56	AB/FQ56
	AB/AQ63	AB/DQ63	AB/EQ63	AB/FQ63
	AB/AQ70	AB/DQ70	AB/EQ70	AB/FQ70

 

 

CCS Steel Plate Grade
General Strength	CCS/A	CCS/B	CCS/D	CCS/E
High Strength	CCS/A32	CCS/D32	CCS/E32	CCS/F32
	CCS/A36	CCS/D36	CCS/E36	CCS/F36
	CCS/A40	CCS/D40	CCS/E40	CCS/F40
Extra Strength	CCS/A420	CCS/D420	CCS/E420	CCS/F420
	CCS/A460	CCS/D460	CCS/E460	CCS/F460
	CCS/A500	CCS/D500	CCS/E500	CCS/F500
	CCS/A550	CCS/D550	CCS/E550	CCS/F550
	CCS/A620	CCS/D620	CCS/E620	CCS/F620
	CCS/A690	CCS/D690	CCS/E690	CCS/F690

 

 

A131 Steel Plate Grade
General Strength	Grade A	Grade B	Grade D	Grade E
High Strength	A131 AH32	A131 DH32	A131 EH32	A131 FH32
	A131 AH36	A131 DH36	A131 EH36	A131 FH36
	A131 AH40	A131 DH40	A131 EH40	A131 FH40

 

 

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

 

 

DNV Steel Plate Grade Supplier
General Strength	NV A	NV B	NV D	NV E
High Strength	NV A32	NV D32	NV E32	NV F32
	NV A36	NV D36	NV E36	NV F36
	NV A40	NV D40	NV E40	NV F40
Extra Strength	NV A420	NV D420	NV E420	NV F420
	NV A460	NV D460	NV E460	NV F460
	NV A500	NV D500	NV E500	NV F500
	NV A550	NV D550	NV E550	NV F550
	NV A620	NV D620	NV E620	NV F620
	NV A690	NV D690	NV E690	NV F690

 

 

BV Steel Plate Grade
General Strength	BV/A	BV/B	BV/D	BV/E
High Strength	BV/AH32	BV/DH32	BV/EH32	BV/FH32
	BV/AH36	BV/DH36	BV/EH36	BV/FH36
	BV/AH40	BV/DH40	BV/EH40	BV/FH40
Extra Strength	BV/A420	BV/D420	BV/E420	BV/F420
	BV/A460	BV/D460	BV/E460	BV/F460
	BV/A500	BV/D500	BV/E500	BV/F500
	BV/A550	BV/D550	BV/E550	BV/F550
	BV/A620	BV/D620	BV/E620	BV/F620
	BV/A690	BV/D690	BV/E690	BV/F690

 

 

GL Steel Plate Grade
General Strength	GL-A	GL-B	GL-D	GL-E
High Strength	GL-A32	GL-D32	GL-E32	GL-F32
	GL-A36	GL-D36	GL-E36	GL-F36
	GL-A40	GL-D40	GL-E40	GL-F40
Extra Strength	GL-A420	GL-D420	GL-E420	GL-F420
	GL-A460	GL-D460	GL-E460	GL-F460
	GL-A500	GL-D500	GL-E500	GL-F500
	GL-A550	GL-D550	GL-E550	GL-F550
	GL-A620	GL-D620	GL-E620	GL-F620
	GL-A690	GL-D690	GL-E690	GL-F690

 

 

NK Steel Plate Grade
General Strength	K A	K B	K D	K E
High Strength	K A32	K D32	K E32	K F32
	K A36	K D36	K E36	K F36
	K AH40	K DH40	K EH40	K F40
Extra Strength	K A43	K D43	K E43	K F43
	K A47	K D47	K E47	K F47
	K A51	K D51	K E51	K F51
	K A56	K D56	K E56	K F56
	K A63	K D63	K E63	K F63
	K A70	K D70	K E70	K F70
	K A63N	K D63N	K E63N	K F63N
	K A70N	K D70N	K E70N	K F70N

 

 

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

 

 

General strength grades

General strength grades are differentiated by their impact test temperature, while all four share the same minimum yield and tensile strength.

Grade A: Impact tested at 20°C.

Grade B: Impact tested at 0°C.

Grade D: Impact tested at -20°C.

Grade E: Impact tested at -40°C.

 

High-strength grades

High-strength grades are further divided by their minimum yield strength and impact toughness.

Yield strength 315 MPa: AH32, DH32, EH32, FH32.

Yield strength 355 MPa: AH36, DH36, EH36, FH36.

Yield strength 390 MPa: AH40, DH40, EH40, FH40.
The letters A, D, E, and F in these grades correspond to the same impact toughness temperatures as the general strength grades, such as 0°C, -20°C, and -40°C.

 

Applications

Shipbuilding plates are used for all major structural components of a vessel.

• Hull: The main body of the vessel, including the bottom, sides, and bulkheads.
• Decks and superstructure: The upper levels and structures of the ship.
• Support structures: Internal frames and other structural reinforcements.
• Offshore structures: Platforms and special vessels for the oil and gas industries.
• Specialized vessels: Plates with very high toughness are used for ice-class vessels or liquefied natural gas (LNG) carriers.

 

 

 

 

 

 

We guarantee the quality and quantity of Shipbuilding Plates. If you would like more information, please contact us!

 

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

 

 

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.

Request A Quote

 

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/ HADOX450/500	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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