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Products & Solutions
Shipbuilding Steel Materials
Shipbuilding Steel Materials
Shipbuilding Steel Materials
1) Overview
Shipbuilding steel materials are specialized steels for ship construction and offshore engineering, offering high strength, toughness, weldability, and corrosion resistance for long-term marine service.
The range includes structural steel plates, marine piping steels, shipbuilding sections, and special alloys, certified by ABS, DNV, LR, BV, CCS, widely used in bulk carriers, oil tankers, container ships, passenger ships, fishing vessels, LNG carriers, and offshore platforms.
2) Manufacturing Process
• Steelmaking: BOF/EAF + LF/VD refining
• Forming: Continuous casting → hot rolled plates & sections
• Heat Treatment: TMCP, normalizing, quenching & tempering (QT)
• Surface: Shot blasting, oiling, primer coating, galvanizing
• Processing: Cutting, bending, welding, prefabrication
3) Grades & Standards
Standards:
• ASTM A131 (Shipbuilding Steel Plates)
• GB 712 (Shipbuilding Structural Steel)
• GB/T 5312 (Seamless steel pipes for shipbuilding)
• JIS G3101 / G3106 (selected grades for ship structures)
Class Society Approvals: ABS, DNV, LR, BV, CCS, NK, RINA, KR
Grades:
• Mild Strength: A, B, D, E
• High Strength: AH32, AH36, DH36, EH36, FH40
• Piping Steels: ASTM A106 Gr.B, ASTM A333 Gr.6, CuNi 70/30, CuNi 90/10
• Special Steels: Corrosion-resistant steels, low-temperature steels, 9%Ni steels for LNG, stainless steels, duplex steels
4) Dimensions
• Plates: Thickness 6 – 200 mm, width ≤ 4200 mm, length ≤ 18000 mm
• Pipes: OD 6 – 1200 mm, WT 1 – 50 mm
• Sections: Bulb flats, angles, channels, H-beams
5) Applications
• Hull: shell plates, decks, keels, bulkheads, bottom plates
• Piping Systems: seawater cooling, fuel, steam, ballast, fire-fighting lines
• Deck Structures: crane foundations, hydraulic systems, supports
• Tankers & LNG Carriers: double hull plates, cryogenic plates, corrosion-resistant piping
• Offshore Platforms: FPSO, drilling platforms, offshore supply vessels
6) Key Features
• Strength Range: 235 – 690 MPa yield strength
• Cryogenic Toughness: reliable at -20℃ to -196℃
• Corrosion Resistance: Cu/Ni alloyed grades for seawater service
• Excellent Weldability: low carbon equivalent for modular shipbuilding
• Thick Plate Capability: up to 200 mm
• Comprehensive Coverage: mild strength, high strength, cryogenic & corrosion-resistant steels
7) Quality & Testing
• Chemical Analysis: spectrometer (C, Mn, Si, Ni, Cu, Mo)
• Mechanical Tests: tensile, impact (-20/-40/-60/-196℃), hardness
• NDT: Ultrasonic (UT), Radiographic (RT), Magnetic particle (MT)
• Z-Direction Properties: Z15/Z25/Z35 for lamellar tearing resistance
• Corrosion Tests: salt spray, seawater immersion
• Certification: MTC (EN 10204 3.1/3.2) + class society certificates (ABS, DNV, LR, BV, CCS)
8) Supply & Packaging
• Supply Forms: plates, pipes, sections, cut-to-size, prefabricated modules
• Surface: shot blasted, oiled, primer coated, galvanized
• Packaging: bundled, wooden pallets, export racks, bulk shipment
• Documentation: MTC + classification society approval
9) Our Advantages
• Full Range: plates, pipes, sections, special steels for shipbuilding
• Certified Supply: ABS, DNV, LR, BV, CCS approvals
• Customization: cutting, welding, prefabricated ship modules
• Global Experience: supplied to major shipyards & offshore projects worldwide
• Quality Assurance: strict QC + third-party inspection
Materials & Dimensions of Steel for Shipbuilding
1. Hull Structural Steel (Mild & High-Strength Ship Plates)
• Standards:
• CCS, ABS, LR, DNV, BV classification society certifications
• Common grades: A, B, AH32, DH36, EH40
• Dimensions:
• Thickness: 6 – 200 mm
• Width: 1500 – 4000 mm
• Length: 6 – 20 m
• Applications: Outer hull plating, decks, double bottom, bulkheads
2. High-Strength Shipbuilding Plates
• Standards: ABS AH/DH/EH36, EH40, API 2W
• Dimensions:
• Thickness: 6 – 120 mm
• Width: 1500 – 3500 mm
• Length: 6 – 18 m
• Applications: Hull strength members, decks, longitudinal frames, stiffeners
3. Profiles & Sections
• Types: Bulb flats, H-beams, angle steel, channel steel
• Dimensions:
• Bulb flats: 60 × 4 mm – 430 × 20 mm
• H-beams: H100 – H900
• Angles/Channels: 50 × 50 mm – 300 × 300 mm
• Applications: Ship skeleton, keel, deck girders, ribs
4. Shipbuilding Pipes
• Carbon Steel Pipes: ASTM A106 Gr.B, API 5L
• Stainless Steel Pipes: ASTM A312 304/316L
• Dimensions:
• OD: 10 mm – 1200 mm
• WT: 2 mm – 50 mm
• Length: 6 m, 12 m
• Applications: Fuel oil lines, ballast water systems, steam lines, cooling water lines
5. Welding Materials
• Types: Shipbuilding welding electrodes, wires, submerged arc flux
• Standards: AWS A5.1, ABS/CCS classification society approval
• Dimensions:
• Electrode diameter: 2.5 – 6.0 mm
• Wire diameter: 1.2 – 4.0 mm
• Applications: Hull welding, deck welding, piping welding
6. Special Alloys for Shipbuilding
• Low-Temperature Steels: ASTM A333 Gr.6, 9%Ni → LNG ship storage tanks
• Dimensions: OD ½” – 36”, WT 3 – 60 mm
• Corrosion-Resistant Alloys: Duplex 2205/2507 → seawater cooling systems
• Dimensions: OD ½” – 24”, WT 2 – 20 mm
• High-Strength Alloys: Bolting steel, bearing steel → propulsion systems, rudder equipment
7. Typical Applications
• Hull Construction: Ship plates + bulb flats + profiles
• Piping Systems: Carbon steel pipes + stainless pipes + flanges
• LNG Carriers: 9%Ni steel, cryogenic steels
• Seawater Systems: Duplex stainless, Cu-Ni alloys
• Propulsion & Power: High-strength alloy steels
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