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Help CenterSteel Sheet & Plate & Shipbuilding Steel Plate，AH32、DH32、EH32、FH32、AH36、DH36、EH36、FH36、AH40、DH40、EH40、FH40
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1. Product Definition & Core Overview
Shipbuilding steel plate, fully named structural steel plate for ship and offshore engineering, is a special hot-rolled steel plate exclusively developed for hull structures, offshore platforms and marine engineering equipment. Manufactured in strict accordance with classification society standards worldwide, it features excellent low-temperature impact toughness, lamellar tear resistance, superior seawater corrosion resistance, fatigue resistance and alternating load resistance. With stable and reliable weldability, the product can serve stably for a long time in harsh marine environments with high salt fog, high humidity, wind and wave impact, and extreme low temperature.
Different from ordinary carbon steel plates, shipbuilding plates adopt strict control of harmful impurities such as sulfur and phosphorus with uniform and dense grain structure. Approved by rigorous ship inspection certification, it possesses core properties including brittle fracture resistance, impact resistance, seawater rust resistance and marine weather aging resistance. It serves as the core load-bearing base material for shipbuilding, ocean shipping, offshore wind power, offshore drilling platforms and port construction machinery.
2. Executive Standards & Classification Society Certification
2.1 Domestic Standards
GB/T 712-2022 Structural steel for ship and offshore engineering (current core national standard)
CCS (China Classification Society) Rules for the Classification of Sea-going Steel Ships, Materials and Welding Specifications
GB/T 709 Dimensions, shape, mass and tolerances of hot-rolled steel plates and strips
GB/T 2970 Ultrasonic testing standard for heavy steel plates
2.2 International Standards & Classification Society Certification
IACS UR W11 General specification for shipbuilding steel plates
ASTM A131 Standard for structural steel plates for shipbuilding
JIS G3106 Marine structural steel standard
EN 10025, EN 10225 European standards for offshore engineering structural steel
Original factory inspection certificates available from CCS, ABS, DNV, BV, LR, KR, NK and other major international classification societies
3. Product Classification & Main Grades
3.1 Classification by Strength Grade
3.1.1 Normal Strength Ship Plate (Grade A/B/D/E)
Special plate for basic hull structures with balanced toughness, excellent weldability and high cost performance. It is applied to non-core load-bearing parts of hulls, cabin partitions, auxiliary deck plates and secondary hull outer structures.
Grade A: Room-temperature impact property, suitable for inland and mild offshore sea area hull structures
Grade B: 20℃ impact property, mainstream material for coastal and offshore ships
Grade D: -20℃ low-temperature impact property, suitable for ocean-going ships and low-temperature sea areas
Grade E: -40℃ ultra-low temperature impact property, dedicated to polar route and frigid sea area ships
3.1.2 High Strength Ship Plate (AH32/DH32/EH32, AH36/DH36/EH36)
Featuring high strength, high toughness and fatigue resistance with higher yield strength and stronger load-bearing capacity, this series is mainly used for core load-bearing hull structures including main decks, bottom plates, side plates, keels and bulkheads. It is widely applied to large cargo ships, container ships, oil tankers and bulk carriers.
Grade 32: Minimum yield strength ≥ 315MPa
Grade 36: Minimum yield strength ≥ 355MPa, the most widely used high-strength ship plate grade
Code explanation: A = Room temperature, D = -20℃, E = -40℃, H = High strength
3.1.3 Ultra-High Strength Ship Plate (AH40/EH40, AH550, DH550, EH550, FH550)
With ultra-high strength, high pressure resistance and strong impact resistance, these plates are designed for heavy-load structures of large ocean-going vessels, offshore drilling platforms, offshore wind power foundations, deep-sea engineering equipment and large military ships, capable of withstanding extreme marine wind-wave loads and alternating stresses.
3.2 Classification by Delivery Condition
AR (As-Rolled): General delivery state for thin and medium plates with moderate cost
TMCP (Thermo-Mechanical Controlled Process): Temperature-controlled rolling with refined grain structure and better toughness, suitable for medium and heavy plates
N (Normalized): Uniform and stable structure with excellent low-temperature impact performance, dedicated to heavy plates and low-temperature working conditions
Normalized + Tempered / Quenched & Tempered: For ultra-high strength heavy plates, eliminating rolling residual stress and preventing subsequent deformation and cracking
4. Specification Range
Thickness: 3mm～150mm; thin plate: 3–14mm, medium plate: 14–50mm, heavy plate: 50–150mm
Width: 1500mm, 1800mm, 2000mm, 2200mm, 2500mm, custom wide width available
Length: 6000mm–12000mm, supporting custom fixed-length cutting, arbitrary cutting, special-shaped cutting and precision beveling
Dimensional Tolerance: Adopting national high-precision tolerance standard with flat and straight plate shape, no camber or wave deformation
UT Inspection Grade: Grade Ⅰ/Ⅱ/Ⅲ ultrasonic testing available to meet marine special equipment inspection requirements
Surface Quality: Clean and flat plate surface without harmful defects such as cracks, scars, delaminations, bubbles and inclusions
5. Core Mechanical Properties
All shipbuilding plates are certified by classification societies with qualified low-temperature impact, cold bending and tensile properties. They are free from brittle fracture and deformation after welding, perfectly adapting to marine alternating load working conditions.
Normal Strength Grades (A/B/D/E): Yield ≥235MPa, Tensile 400–520MPa, Elongation ≥24%
AH32/DH32/EH32: Yield ≥315MPa, Tensile 440–570MPa, sufficient low-temperature impact energy
AH36/DH36/EH36: Yield ≥355MPa, Tensile 490–630MPa, optimal comprehensive strength and toughness
Processing Performance: No cracks after 180° cold bending test, supporting arbitrary bending, rolling and welding forming
Low-Temperature Toughness: Qualified impact performance at -20℃ for Grade D and -40℃ for Grade E, eliminating low-temperature brittle fracture risks
6. Production Process Flow
High-quality molten steel refining (vacuum degassing, sulfur & phosphorus reduction) → Continuous casting thick slab → Uniform heating in walking-beam furnace → High-pressure water intensive descaling → Multi-pass precision controlled rolling → TMCP temperature-controlled cooling → Straightening & leveling → Heat treatment (normalizing/tempering on demand) → Shot blasting surface cleaning → Steel stamping marking (grade, heat batch number, classification society logo) → 100% ultrasonic inspection → Physical & chemical mechanical sampling test → Fixed-length cutting & beveling → Anti-rust treatment → Packaging & warehousing & ship inspection certification
The whole process adopts refined controlled rolling and cooling to form dense and uniform grain structure, significantly improving the plate’s fatigue resistance, impact resistance and seawater corrosion resistance, fully meeting the long-term service standards of ocean-going ships.
7. Core Product Advantages (vs Ordinary Steel Plates)
Strict Classification Society Certification & Full ComplianceAll products pass certification of multiple international classification societies with official ship inspection certificates, directly applicable to shipbuilding, offshore engineering inspection and export projects.
Superior Low-Temperature Brittle Fracture ResistanceUltra-low impurity content and refined metallographic grains ensure no brittle fracture in frigid and low-temperature environments, far outperforming ordinary structural plates.
Marine Corrosion & Salt Fog Aging ResistanceAdaptable to high-salt-fog and high-humidity marine conditions, resisting sea wind and seawater erosion without easy aging and rusting during long-term offshore service.
Fatigue & Alternating Load ResistanceMaterial optimized for repeated wave impact and hull deformation, avoiding fatigue cracking and deformation under long-term alternating stress.
Excellent Weldability & FormabilityLow carbon equivalent prevents cold and hot welding cracks, supporting rolling, bending and complex hull forming with extremely low repair rate.
Full Quality TraceabilityIndependent heat batch number, complete physical & chemical reports, ultrasonic inspection reports and ship inspection certificates for each plate, satisfying strict shipbuilding acceptance standards.
8. Main Application Fields
Shipbuilding Industry: Hull bottom plates, decks, side plates, keels, bulkheads and outer shell structures of bulk carriers, container ships, oil tankers, chemical tankers, ro-ro ships and inland vessels.
Offshore Engineering Equipment: Offshore drilling platforms, offshore wind power foundation piles, floating marine platforms, deep-sea operation equipment and cross-sea engineering steel structures.
Port Construction Machinery: Port crane structures, dock trestles, port anti-collision facilities and load-bearing structures of offshore operation equipment.
Ocean-Going Special Equipment: Polar ships, refrigerated transport vessels, offshore floating structures and marine oil storage pressure structures.
Ship Supporting Components: Cabin partitions, hull stiffeners, ship fenders, deck cover plates and marine load-bearing brackets.
9. Processing, Welding & Operation Specifications
Match plate grades with actual sea conditions: Grade B/D for offshore areas, Grade E low-temperature plates for ocean-going and frigid sea areas.
Special marine welding consumables must be adopted for ship plate welding in strict accordance with classification society welding specifications; stress relief treatment shall be performed as required after welding.
Re-ultrasonic inspection is required for heavy plate structures to eliminate internal delaminations and cracks and ensure hull structural safety.
Supporting anti-corrosion coating including anti-rust primer and marine topcoat is mandatory for offshore service to delay seawater corrosion and salt fog aging.
Avoid local stress concentration during bending and rolling processing to prevent structural cracking under low-temperature conditions.
Ordinary structural plates are prohibited from replacing ship plates for hull core load-bearing structures to avoid compliance and safety risks.
10. Packaging, Quality Assurance & Customization Services
10.1 Standard Packaging
Plates are neatly stacked with wooden block isolation, surface anti-rust and anti-scratch film coating and edge protection. Reinforced with multiple steel straps, the packaging adapts to sea and long-distance land transportation to prevent deformation, collision and scratch damage. Exclusive moisture-proof and waterproof sea packaging is available for export products.
10.2 Complete Quality & Ship Inspection Documents
Complete original documents are provided, including factory material certificate, chemical composition report, mechanical property test report, low-temperature impact test report, ultrasonic inspection report, classification society certification and product qualification certificate. Third-party SGS and BV inspection is supported to meet shipbuilding inspection, export customs clearance and project audit requirements.
10.3 Customization Services
Support non-standard thickness and width customization, arbitrary fixed-length cutting, special-shaped processing, beveling, shot blasting rust removal and anti-corrosion pretreatment. Custom delivery states such as TMCP, normalizing and quenching & tempering are available to meet special working condition requirements of various ships and offshore projects. Multi-standard compliant material certificates can be provided for global projects.
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