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Help CenterSteel Sheet & Plate & Marine Shipbuilding Steel Plate，AH36、DH36、EH36、A、B
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1. Product Definition
Shipbuilding Steel Plate, full name Structural Steel Plate for Ship and Offshore Engineering, is special hot rolled steel plate exclusively used for hull structures and offshore platforms, certified by global classification societies. Strict control of sulfur and phosphorus impurities delivers excellent low-temperature impact toughness, lamellar tearing resistance, outstanding weldability, seawater salt fog corrosion resistance and fatigue resistance under alternating wave loads. It can serve stably long-term under harsh marine conditions with high humidity, heavy salt fog and extreme temperature fluctuation.
Domestic Standard: GB/T 712-2022 Structural Steel for Ship and Offshore EngineeringInternational Standards: ASTM A131, IACS Unified Rules; Certificates available for CCS, ABS, DNV, BV, LR, NK, KR classification societies.
2. Grade Classification & Service Navigation Zones
2.1 Ordinary Strength Ship Plate (Min Yield ≥235MPa)
Grade A: No mandatory impact test, for inland vessels, non-load-bearing inner cabin structures and small deck accessories
Grade B: Qualified impact test at 0℃, for coastal short-distance cargo ships, fishing boat common hull plates and superstructures
Grade D: -20℃ low-temperature impact resistance, key load-bearing parts of ocean-going vessels including bottom plates, side plates, main decks and bulkheads
Grade E: -40℃ ultra-low temperature impact resistance, main hull structures for transoceanic cold-latitude routes and frigid sea areas
2.2 High Strength Ship Plate (Most Widely Used)
Grade naming rule: AH/DH/EH/FH + number, H stands for high strength, number refers to minimum yield strength; prefix letter indicates impact test temperature
Series 32: AH32/DH32/EH32, Min yield ≥315MPa
Series 36: AH36/DH36/EH36, Min yield ≥355MPa, mainstream grade for container ships, bulk carriers and oil tankers
Series 40: AH40/DH40/EH40, Min yield ≥390MPa, for heavy-duty structures of large offshore platforms and heavy vessels
2.3 Ultra-High Strength Ship Plate (Heavy Offshore Components)
FH36, FH40, EH460 with -60℃ extreme low temperature impact resistance, min yield strength 460MPa; applied for semi-submersible platforms, drilling platform legs and load-bearing hull structures of large oil storage vessels.
3. Heat Treatment Delivery Status
TMCP Thermo-Mechanical Controlled Rolling: Mainstream supply process, refined grain, low carbon equivalent and optimal weldability, suitable for thickness 6–100mm
HR Hot Rolled: Only for thin plates below 8mm, auxiliary plates for light inland vessels
N Normalizing: For heavy plates over 50mm and critical offshore components, greatly improve low-temperature toughness
Normalizing + Tempering: For ultra-high strength FH series and polar ships, release internal stress and resist fatigue cracking
Optional Additional Properties
Z-direction performance Z15/Z25/Z35: Designed for thick plate T-joint welding to prevent lamellar tearing
Ultrasonic Test: Grade I/II per NB/T47013, mandatory for offshore platforms and large oil tankers
Surface Pre-treatment: Shot blasting & priming to meet PSPC coating standard for ship ballast tanks
4. Complete Specification Parameters
Thickness: 8–250mm, regular stock range 10–120mm; maximum 250mm for offshore heavy plates
Width: 1500/1800/2000/2200/2500/3000/4200mm, customized extra width available
Length: 6000–12000mm, cut-to-length and special shape cutting per drawing
Surface Finish: Hot rolled black scale, sandblasting and shot blasting pre-treatment optional
Tolerance Standard: Dimensional tolerance comply with GB/T709, Class C high precision tolerance upon request
5. Standard Mechanical Properties (Medium Thickness Reference)
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation | Impact Test Temp | Min Impact Energy |
|---|---|---|---|---|---|
| A/B | ≥235 | 400–520 | ≥22% | Grade B: 0℃ | 27J |
| D/E | ≥235 | 400–520 | ≥22% | D: -20℃ / E: -40℃ | 34J |
| AH36/DH36 | ≥355 | 490–630 | ≥21% | AH:0℃ / DH:-20℃ | 34J |
| EH36 | ≥355 | 490–630 | ≥21% | -40℃ | 34J |
6. Core Product Advantages
Strict metallurgical control: Ultra-low S & P content, adjustable carbon equivalent, effectively reduce cold welding crack risk during ship construction
Stable toughness across full temperature range: Qualified impact performance from ambient to -60℃, avoid brittle fracture in polar and frigid sea areas
Superior marine weather resistance: Resist seawater salt fog, high humidity and wave impact, anti-fatigue cracking for long-term service
Excellent forming & weldability: Smooth cold bending, hot rolling, edge milling and groove processing, wide construction process window for shipyards
Optional Z-direction anti-tear performance: Z15/Z25/Z35 guarantee safety for full penetration welding of thick plates
Full classification society certification: Original certificates from multiple marine societies, fully compliant for domestic and overseas shipbuilding & offshore projects acceptance
Stable fatigue resistance: Adapt to long-term alternating wave loads during navigation, extend vessel service life
7. Main Application Fields
Civil ShipbuildingBulk carriers, container ships, oil tankers, ro-ro ships, fishing boats, inland transport vessels, hull bottom plates, side plates, decks, keels, bulkheads and superstructures
Offshore Engineering EquipmentOffshore drilling platforms, semi-submersible platforms, wind power jacket structures, floating buoys, oil storage barges and underwater supporting load-bearing structures
Port & Marine Auxiliary FacilitiesPort pontoons, floating docks, navigation buoys, ship repair dock bodies and load-bearing plates for port lifting equipment
Special Marine EquipmentPolar transport vessels, marine aquaculture platforms, temporary offshore operation platforms and dredger hull shells
8. Export Packing, Lead Time & Delivery Documents
Packing: Plates stacked on wooden supports and fixed with steel straps; heat number, classification society grade, thickness and UT grade marked on surface; waterproof anti-rust film covered for long sea transportation
Lead TimeStandard in-stock ship plates: 5–7 working daysCustom normalized/TMCP heavy plates, Z-direction & ultrasonic pre-treated plates: 8–12 working days
Complete Delivery DocumentsOriginal Classification Society Material Test Certificate (MTC), Spectral Chemical Composition Report, Low-Temperature Impact Mechanical Test Report, Ultrasonic Test Report, Factory Inspection Certificate, Marine Survey Compliance Certificate
9. Key Acceptance Inspection Items
Verify classification society grade, thickness, heat treatment delivery status, impact temperature grade, Z-direction & UT test requirements
Check special test reports including low-temperature impact, Z-direction tensile and ultrasonic inspection original records
Visual inspection: No lamination, crack, scar, shell, deep indentation or heavy oxide scale on plate surface
Dimensional tolerance: Thickness, width, length and flatness comply with GB/T709 standard
Navigation zone selection rule: EH/FH grades for ocean-going cold zones, B/D grades for coastal short voyages, Grade A for inland vessels
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