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Help CenterSteel Sheet & Plate & Cargo Vessel Hull Plate，AH40/DH40/EH40、AH50/DH50/EH50、EH550
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1. Product Overview
Shipbuilding steel plates are hot rolled structural steel plates specially used for hulls, offshore platforms, offshore wind power and floating marine equipment, certified by global classification societies. Subject to long-term seawater salt spray corrosion, alternating wave loads, low temperature and vibration impact, they feature outstanding low-temperature impact toughness, high fatigue strength, superior weldability, resistance to lamellar tearing and uniform metallographic structure, effectively avoiding hull cracking and brittle fracture during navigation. Widely applied to bulk carriers, container ships, oil tankers, LNG carriers, icebreakers and offshore drilling platforms.
Main Implementation Standards
Chinese National StandardGB/T 712-2011 Structural Steel for Ships and Offshore Engineering
International Classification Society StandardsASTM A131 (ABS), EN 10025, DNV, BV, LR Rules; JIS G3106 (NK)Main Certifications: CCS, ABS, DNV, BV, LR, NK, KR
Supporting Test StandardsGB/T 228 Tensile Test, GB/T 229 Charpy Low-temperature Impact Test, UT Ultrasonic Testing, Z-direction Lamellar Tearing Test, Cold Bending Test
2. Main Steel Grades, Grading & Application Conditions
2.1 Normal Strength Ship Plates (Yield ≥235MPa, Grade A/B/D/E)
Grade A: Impact test at 0℃; for inland vessels, non-critical superstructure parts
Grade B: Impact test at +20℃; decks & bulkheads of ordinary offshore vessels
Grade D: Impact test at -20℃; general hull structures of ocean-going ships
Grade E: Impact test at -40℃; hull shells operating in cold sea areas
2.2 High Strength 355MPa Grade (Most Popular, Yield ≥355MPa)
AH36: Impact at 0℃Application: Offshore vessels, decks, side shells, secondary platform components
DH36: Impact at -20℃Application: Main hull structures of ocean bulk carriers, container ships and oil tankers, bottom plates
EH36: Impact at -40℃Application: Northern ocean-going vessels, ice-class ships, main body of offshore platforms, auxiliary LNG structures
FH36: Ultra-low temperature impact at -60℃Application: Polar icebreakers, LNG low-temperature hull structures, platforms in frigid sea zones
2.3 Extra High Strength Ship Plates (390/420/460/500/550MPa)
AH40/DH40/EH40, AH50/DH50/EH50, EH550Application: Thickened decks of large container ships, heavy offshore platforms, FPSO floating production units, critical high-stress hull sections of ultra-large vessels
2.4 Z-direction Performance Plates (Z15/Z25/Z35)
Application: Thick plate key welded structures to prevent lamellar tearing during welding, thick keels of hulls, platform jackets
3. Specification Parameters
Thickness Range: 6mm ~ 100mm
Width: 1500/1800/2000/2200/2400/2600mm
Standard Length: 6000mm, 12000mm; customized random lengths 3–14m available
Dimensional Tolerance: Comply strictly with GB/T712 and classification society standards; flatness & camber meet CNC cutting requirements for shipbuilding
UT Inspection Grade: Grade Ⅰ / Ⅱ ultrasonic testing; additional lamination inspection for Z-grade plates
Delivery State: Controlled Rolling (CR), Normalized (N), TMCP thermo-mechanical controlled rolling; classification society certificates supplied on request
4. Complete Production Process
Steelmaking Refining: LF+VD double refining, strictly limit low S & P impurities to reduce cold brittleness and lamellar cracking risk, refine grain structure
Continuous casting slab production, surface grinding to remove subcutaneous defects
Uniform high-temperature heating, segmented temperature-controlled rolling (TMCP process)
Heat treatment: Controlled rolling / normalizing / tempering to stabilize low-temperature impact toughness
Shot blasting to remove oxide scale for convenient UT inspection & shipyard welding
Full physical-chemical mechanical tests + 100% ultrasonic testing; Z-direction tensile test for Z-grade plates
Witness inspection by classification society surveyors, marking spraying, cutting to fixed lengths, packing & warehousing
5. Mandatory Factory Inspection Items (Witnessed by Surveyors)
Spectral composition analysis: Strict control of carbon equivalent, S, P, Al, Nb, V micro-alloy elements
Mechanical tests: Room-temperature tensile, V-notch Charpy low-temperature impact at specified temperatures, hardness, 180° cold bending without cracks
Z-direction lamellar tearing test (for Z15/Z25/Z35 plates)
100% ultrasonic testing to detect internal lamination, shrinkage cavities, cracks and inclusions
Full visual inspection: Free of scabs, cracks, lamination, double skins and pits
Sampling witnessed by classification society, official marine inspection certificates issued
6. Main Application Fields
Commercial ShipbuildingHull shells, decks, bulkheads, bottom plates, keels and superstructures of bulk carriers, container ships, oil tankers, chemical tankers, ro-ro vessels and fishing boats
Offshore Engineering EquipmentOffshore oil drilling platforms, jackets, offshore wind tower foundations, FPSO floating production platforms, offshore trestles
Special Low-temperature VesselsLNG carriers, polar icebreakers, research vessels, ice navigation ships
Port & Steel StructureLarge port cranes, marine construction machinery, heavy coastal anti-corrosion steel structures
7. Core Product Advantages
Full Classification Society Certifications: Valid CCS/ABS/DNV/BV/LR/NK/KR marine certificates, globally accepted by shipyards
Superior Low-temperature Toughness: Graded impact temperature A/B/D/E/F, no brittle fracture in frigid sea areas
Anti-fatigue & Anti-lamellar Tearing: Low S & P clean molten steel, optional Z-direction performance, crack-free welding of thick plates
Excellent Weldability: Low carbon equivalent, simple on-site shipyard welding process, no delayed post-weld cracks
Resistance to Alternating Marine Loads: Uniform microstructure, stable dimension without deformation under long-term wave vibration
Complete Size Range covering thin to extra-thick plates, suitable for construction of all types of ships and offshore platforms
8. Delivery, Packing & Logistics
Delivery State: TMCP controlled rolling, normalized, tempered; shot blasted black oxide surface
Marking: Each plate sprayed with grade, classification society mark, heat batch number, dimension, UT grade and official marine stamp
Packing: Thin plates bundled with steel strips on wooden pallets; thick plates fixed separately with rainproof film
Delivery Lead TimeRegular in-stock A/B/D/AH36/DH36: Delivery within 5–7 days; customized EH36/FH36, Z-grade plates, extra high strength EH550: 7–10 days, container shipment available from Tianjin Port
Attached Shipping Documents: Original Mill Test Certificate, tensile & impact test report, UT inspection report, original marine inspection certificates issued by classification societies
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