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Help CenterSteel Sheet & Plate & Shipbuilding Steel Plate，ASTM A131、EN10025、EN10225、DNV、LR、ABS
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1. Product Overview
Shipbuilding steel plate, full name structural steel plate for ship hull & offshore engineering, is specially developed for harsh marine environment. Manufactured via clean steel refining and TMCP thermo-mechanical controlled rolling & cooling process, it strictly limits harmful impurities sulfur and phosphorus, featuring excellent low-temperature impact toughness, resistance to marine atmospheric corrosion, high fatigue strength and superior high heat input weldability. All products pass factory approval of multiple international classification societies. Divided into four series: general strength ship plate, high strength ship plate, ultra-high strength offshore plate and low-temperature crack arrest plate. Widely applied for main load-bearing structures of ocean-going vessels, inland ships, offshore drilling platforms, wind turbine installation vessels and LNG carriers, meeting long-term service requirements under wave impact, low-temperature sea areas and alternating loads.
2. Applicable Standards & Classification Society Certifications
Domestic Chinese Standards
GB/T 712-2011 Structural Steel for Ships and Offshore Engineering (Core Standard)
IACS UR W Unified Rules for Marine Steel
International Export Standards
ASTM A131, EN10025, EN10225, DNV, LR, ABS Specifications
Authorized Classification Society Certifications
Factory approval of 9 major classification societies: CCS (China), ABS (USA), DNV (Norway), LR (UK), BV (France), NK (Japan), KR (Korea). Each batch is attached with classification society certificate, SGS test report and original Mill Test Certificate (MTC).
3. Main Material Grades (Stainless Steel Excluded)
3.1 General Strength Hull Plate (Yield 235MPa, Bulkhead & Deck Auxiliary Material)
CCSA, CCSB, CCSD, CCSEImpact temperature classification: A (ambient), B (+20℃), D (-20℃), E (-40℃) for low temperature service
3.2 High Strength Ship Plate (Yield 355MPa, Hull Shell, Keel & Main Load-Bearing Parts)
AH32/DH32/EH32, AH36/DH36/EH36, AH40/DH40/EH40A for ambient, D for -20℃, E for -40℃ low temperature impact; mainstream material for container ships, bulk carriers and oil tankers
3.3 Ultra-High Strength Offshore Engineering Plate (Offshore Platform, Wind Installation Vessel, Deep Water Jacket)
FH36, FH40, E500, E690, Z15/Z25/Z35 through thickness performance steel plate, anti-lamination tearing
3.4 Special Low-Temperature Ship Plate (LNG Carrier, Polar Icebreaker)
09MnNiDR, Ni-series carbon-manganese low temperature steel, high impact energy at -60℃ to prevent low-temperature brittle fracture
4. Delivery Heat Treatment Process
TMCP Thermo-Mechanical Controlled Rolling & Cooling (Mainstream Delivery)Integrated rolling & accelerated cooling refines grain structure, no extra normalizing required, cost-effective with excellent weldability; standard supply for AH36/DH36
N NormalizedMandatory for heavy plate, E-grade low-temperature plate and Z-direction performance plate, greatly improved low-temperature impact toughness
Q+T Quenched & TemperedSpecial for ultra-high strength E500/E690 offshore plate, balanced high strength and toughness for deep water platform load-bearing components
5. Complete Production Process
Converter refining + vacuum degassing → Calcium treatment to remove inclusions → Continuous casting slab → High temperature homogenizing furnace heating → Rough & finish rolling on 4-high mill → ACC accelerated cooling TMCP process → Straightening to eliminate rolling deformation → Shot blasting to remove surface mill scale → 100% UT ultrasonic NDT → Sampling tensile / low temperature impact / cold bending test → Steel stamping with classification society marks → CNC edge cutting & fixed length cutting → Temporary anti-rust coating → Steel-wood pallet bundling & warehousing
6. Core Technical Parameters
6.1 Size Range
Thickness: 6mm ~ 150mm, customized thin deck plate & extra-thick platform load-bearing plate available
Width: 1500mm ~ 4800mm, mainstream wide width 2000/2200/2500mm
Single plate length: 6000mm ~ 18000mm, support customized fixed length cutting & special bevel machining
Z-direction performance: Optional Z15/Z25/Z35, anti-lamination tearing for heavy welded structures
6.2 Key Mechanical Properties (Universal for AH36/DH36/EH36)
Minimum Yield Strength: 355MPa; Tensile Strength: 490–630MPa; Elongation ≥21%
Low-temperature impact energy: AH36 (≥34J at 0℃), DH36 (≥34J at -20℃), EH36 (≥34J at -40℃)
6.3 NDT & Surface Requirements
Full-plate ultrasonic inspection meets Grade Ⅱ standard, free of lamination, internal slag inclusion and microcrack defects
Surface free of scar, heavy skin, deep scratches and bubbles; clean surface after shot blasting, compliant with IMO PSPC marine coating standard
6.4 Welding Advantages
Low carbon equivalent & low cold crack susceptibility coefficient, compatible with SAW, GMAW and SMAW, suitable for high heat input block welding without brittle cracking at weld joints
7. Core Product Advantages
Certified by nine international classification societies, fully compliant for shipbuildingFactory holds official classification society qualification, unique stamping ID on each plate; complete documents for shipyard inspection and overseas vessel export customs clearance.
Excellent low-temperature toughness for global sea areasE/F grade plates maintain stable impact performance from -40℃ to -60℃, applicable for high-temperature tropical sea and polar low-temperature vessels to avoid brittle fracture accidents.
TMCP grain refining technology with outstanding weldabilitySuitable for high heat input block welding without complex preheating, greatly shorten shipbuilding cycle and reduce welding scrap rate.
Optional Z-direction performance for safe heavy plate large structuresZ15/Z25/Z35 anti-tear steel for thick plate assembly welding and offshore platform columns, prevent structural failure from lamination tearing.
Resistance to marine atmospheric fatigue & corrosion, long vessel service lifePrecisely controlled Cu & Ni alloy elements resist marine salt spray and alternating wave loads, ocean-going hull service life exceeds 20 years.
Sufficient wide-width plate stock & customized deep processingWide full plate reduces hull welding seams, one-stop processing including cutting, beveling and shot blasting pretreatment, fit for bulk 40HC container export.
8. Main Application Fields
8.1 Ocean-Going Shipbuilding (Largest Consumption)
Hull shell, deck, bulkhead, keel and bottom load-bearing structure of container ships, bulk carriers and product oil tankers
8.2 Special Vessel Engineering
Low-temperature hull plate for LNG carriers, polar icebreakers, fishing boats, yachts and engineering salvage vessels
8.3 Offshore Oil & Gas Platforms
Self-elevating drilling platform, deep water jacket, FPSO floating production storage & offloading unit, platform column and extra-thick deck load-bearing plate
8.4 Offshore New Energy Equipment
Offshore wind turbine installation vessel, wind tower foundation platform, floating photovoltaic structural steel plate
8.5 Inland Vessels & Port Machinery
Inland cargo ships, ferries, port cranes, dock trestles, prefabricated block plate for ship repair yards
8.6 Coastal Anti-Corrosion Steel Structures
Cross-sea bridges, coastal guardrails, marine sluices, port storage tank load-bearing steel plate
9. Packaging, Shipment & Lead Time
Packaging Methods
Regular medium & thin plates: Stacked on steel-wood pallets, cross & vertical steel strapping, iron corner guards to prevent collision damage
Extra-thick offshore plates: Single plate fixed on IPPC fumigated solid wooden pallets, temporary anti-rust oil coated on surface
Export dedicated packaging: Whole pallet wrapped with thickened waterproof anti-rust plastic film, fit for 40HC high cube container sea transportation
2. Delivery Warehouse: Spot goods shipped directly from Tianjin Port
3. Lead Time: 5–7 days for regular A/B/D/AH36/DH36 stock goods; 12–20 days for customized orders of EH/FH low-temperature plate and Z-direction extra-thick plate
4. Payment Term: 30% TT advance deposit, balance settled before shipment, L/C letter of credit is not accepted.
10. Mandatory Full Factory Classification Society Inspection Items
Spectral chemical composition analysis of raw slab, strictly control harmful impurities S & P
100% UT ultrasonic NDT on every single plate to detect internal lamination defects
Sampling tensile, normal/low temperature V-notch impact, cold bending and hardness mechanical test
Z-direction tensile test (mandatory for Z15/Z25/Z35 orders)
Full dimension inspection of thickness, width, length and plate flatness
Visual surface inspection plate by plate to eliminate rolling defective plates
Classification society certification, original Mill Test Certificate and third-party SGS authoritative test report provided
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