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Help CenterSteel Sheet & Plate,Marine Plate ,AH36, DH36, EH36,AH40, DH40, EH40,AH32, DH32
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Shipbuilding Steel Plate / Marine Plate Product Detailed Description
1. Product Overview
Shipbuilding Steel Plates (Marine Plates) are specialized hot-rolled steel products manufactured for the construction of ships and offshore engineering structures. They feature exceptional strength, toughness, corrosion resistance, and impact toughness to ensure safe and reliable operation in harsh marine environments. As the core material for ship hulls, decks, bulkheads, and structural frames, marine plates must pass strict quality inspections and obtain classification society certificates for global shipbuilding compliance.
2. Product Classification
2.1 By Strength Grade
• General Strength Shipbuilding Plates: Suitable for non-primary structural components.
◦ Common Grades: AH32, DH32, EH32
• High Strength Shipbuilding Plates: Primary material for main hull structures, large vessels, and high-load components.
◦ Common Grades: AH36, DH36, EH36 (International Mainstream)
◦ Extra High Strength: AH40, DH40, EH40
2.2 By Special Purpose
• Corrosion-Resistant Plates: Designed for oil tankers, chemical tankers, and other corrosion-critical structures.
• Low-Temperature Service Steel: For vessels navigating polar routes or cold seas, as well as offshore structures in low-temperature environments.
◦ Common Grades: AH32N, DH32N, EH32N (Suffix "N" denotes Normalized treatment)
• Offshore Structural Plates: Used for oil drilling platforms, wind turbine jackets, and marine engineering foundations.
3. Core Technical Specifications
3.1 Size Range
• Thickness: 5mm - 100mm (Custom extra-thick available)
• Width: 1500mm - 3000mm (Common sizes: 1500/1800/2000/2200/2400/2500/2600/2800/3000mm)
• Length: 6000mm - 20000mm (Common sizes: 6000/8000/9000/10000/12000/18000/20000mm, Custom cutting available)
• Format: Width × Length × Thickness (e.g., 2000 × 10000 × 12mm)
3.2 Applicable Standards
Standard System Code Application Scope
International Standard ISO Global general use
Chinese Standard GB/T 712 For Chinese shipyards & export orders
European Standard EN 10025 For European & international projects
American Standard ASTM A131 For US shipyards & North American market
Japanese Standard JIS G 3106 For Japanese shipyards & Southeast Asian market
4. Key Certifications & Material Grades
4.1 Mandatory Classification Society Certifications
Marine plates must hold certifications from one of the following societies to be eligible for shipbuilding:
• CCS (China Classification Society) - Preferred in China & global markets
• LR (Lloyd's Register) - Global standard
• DNV (Det Norske Veritas) - Leading in Europe & offshore engineering
• GL (Germanischer Lloyd)
• BV (Bureau Veritas)
• KR (Korean Register of Shipping)
• NK (Nippon Kaiji Kyokai)
• ABS (American Bureau of Shipping)
4.2 Typical Grade Conversion Chart
International Grade (ISO/GB) US Standard (ASTM) European Standard (EN) Description
AH36 A36 S355NL Most popular high-strength marine plate, cost-effective
DH36 D36 S355NL Higher toughness, suitable for low-temperature seas
EH36 E36 S355NL Ultra-high strength, used in large container ships & aircraft carriers
AH32 A32 S355N General strength, high cost-performance ratio
5. Surface Treatment & Quality Features
5.1 Surface Conditions
• Hot-Rolled Black Surface: Original as-rolled finish, lowest cost, suitable for secondary structures or subsequent painting.
• Normalized Surface: Uniform microstructure after heat treatment, superior performance, ideal for high-stress key components.
• Shot Blasted: Removes oxide scale and rust, meets strict surface roughness requirements for paint adhesion (SA2.5/SA3.0).
• Primer Painted: Coated with anti-rust primer (red lead or epoxy primer) for basic corrosion protection.
5.2 Core Quality Advantages
• High Strength & Toughness: Excellent low-temperature impact toughness prevents brittle fracture in cold seas.
• Excellent Weldability: Compatible with major welding processes (CO₂ gas shielded arc welding, submerged arc welding, etc.).
• Superior Corrosion Resistance: Optimized alloy composition resists salt spray, seawater, and marine atmosphere.
• High Dimensional Accuracy: Strict thickness and flatness tolerance meet precise shipbuilding requirements.
6. Main Application Fields
1. Shipbuilding:
◦ Hull Structures: Shell plating, decks, bulkheads, and superstructures.
◦ Special Vessels: Container ships, bulk carriers, tankers, LNG carriers, and warships.
2. Offshore Engineering:
◦ Offshore drilling rigs, oil production platforms, wind turbine jackets, and subsea supports.
3. Heavy Engineering:
◦ Large crane booms, shield machine structural parts, and heavy equipment bases.
7. Packaging & Transportation
7.1 Packaging
• Bundled with Steel Straps: Packed in stable bundles for easy lifting.
• Standard Tag: Each bundle is labeled clearly with Grade, Size, Heat Number, Standard, and Certificate.
7.2 Transportation
• Modes: Supports bulk shipment, container shipping, land transport, and rail transport.
• Ports: Available from major Chinese ports (Qingdao, Tianjin, Shanghai, Lianyungang) for global delivery.
8. Customization & Services
• Custom Cutting: Precision cutting to customer drawings or specific dimensions.
• Value-Added Processing: Leveling, drilling, bending, and welding services.
• Quality Assurance: Supplied with Mill Test Certificate (MTC) and Classification Society Certificates for project acceptance.
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