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Help CenterSteel Sheet & Plate & Shipbuilding Steel Plate，A、B、D、E、AH32、DH32、EH32、AH36、DH36、EH36
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1. Product Overview
Shipbuilding Steel Plate is structural steel plate exclusively for ship hull and offshore engineering structures. It is rolled with low-sulfur and low-phosphorus clean steel slabs, divided into normal strength, high strength and ultra-high strength series. It features excellent low-temperature impact toughness, seawater salt fog corrosion resistance, superior weldability and wave fatigue resistance. All plates are certified by international classification societies, complying with mandatory construction standards for ocean-going vessels and offshore platforms.
Production Process: Refined Steel Slab → Controlled Hot Rolling / TMCP Thermo-Mechanical Controlled Processing → Straightening & Cooling → Ultrasonic Inspection → Shot Blasting & Shop Primer Coating → Edge Cutting & Fixed Length → Marking, Bundling & Shipment
2. Executive Standards & Main Grade Introduction
2.1 Applicable Standards
GB Standard: GB/T 712-2022 Structural Steel for Ships and Offshore Engineering
International Classification Society Code: IACS UR W11
ASTM Standard: ASTM A131
JIS Standard: JIS G3106
EN Standard: EN 10025, NORSOK Offshore Standard Certificates from 9 global classification societies including CCS, ABS, DNV, BV, LR, KR are available.
2.2 Grade Naming Rules
A/B/D/E/F: Low-temperature impact grade (A:0℃, B:+20℃, D:-20℃, E:-40℃, F:-60℃)
H: High Strength; Number = Minimum Yield Strength (32=315MPa, 36=355MPa, 40=390MPa)
Prefix CCS: Certified by China Classification Society
2.3 Main Grade Classification & Working Conditions
| Series | Typical Grades | Strength Level | Impact Temperature | Core Application Parts |
|---|---|---|---|---|
| Normal Strength Plate | CCS A / CCS B / CCS D / CCS E | Yield ≥235MPa | A:0℃, B:+20℃, D:-20℃, E:-40℃ | Superstructure, bulkheads, decks, secondary hull plates, inland small vessels |
| Medium High Strength Plate | AH32 / DH32 / EH32 | Yield ≥315MPa | AH:0℃, DH:-20℃, EH:-40℃ | Medium cargo ships, container ship side plates, deck longitudinal girders, frames |
| Main High Strength Plate | AH36 / DH36 / EH36 | Yield ≥355MPa | AH:0℃, DH:-20℃, EH:-40℃ | Ocean cargo vessels, oil tankers, bulk carrier hull shell plates, bottom plates, strength decks, general offshore components |
| Ultra-High Strength Plate | AH40 / DH40 / EH40 / FH40 | Yield ≥390MPa | FH:-60℃ ultra-low temp | Large container ships, icebreakers, deep-sea offshore drilling platforms, heavy-load key hull structures |
3. Supply Specifications & Dimensional Parameters
3.1 Size Range
Thickness: 6mm～150mm; Regular stock 8–100mm, customized extra-thick offshore plate up to 200mm
Width: 1500mm–3000mm, max rolling width 4800mm
Fixed Length: 3000mm–12000mm, CNC irregular cutting & non-standard sizes available
Single Plate Weight: 0.8–30 tons, bulk delivery by full truck or 40HC container
Edge Type: Slit Edge (burr-free, standard for export ships), Mill Edge
Z-Direction Performance: Z15/Z25/Z35 anti-lamellar tearing plate optional for key welding parts over 40mm thick
3.2 Dimensional & Inspection Precision
Strictly controlled thickness negative tolerance; flatness and camber meet classification society standards. 100% factory UT ultrasonic testing (Grade Ⅰ / Grade Ⅱ optional), free of internal lamination, slag inclusion and cracks.
4. Core Chemical Composition (Strict Impurity Control)
Uniform limit for all ship plates: S≤0.025%, P≤0.025% to reduce cold brittleness and welding crack risk. Trace Cu & Ni added to improve marine corrosion resistance; low-carbon design guarantees full-position welding performance.
5. Standard Mechanical Properties (Hot Rolled / TMCP Delivery Condition)
| Grade | Yield Strength ReL(MPa) | Tensile Strength Rm(MPa) | Elongation A ≥% | V-Notch Impact KV2(J) |
|---|---|---|---|---|
| CCS A/B/D/E | ≥235 | 400–520 | 21 | ≥34 (at corresponding test temp) |
| AH32/DH32/EH32 | ≥315 | 450–570 | 20 | ≥34 |
| AH36/DH36/EH36 | ≥355 | 490–630 | 21 | ≥34 |
| AH40/DH40/EH40 | ≥390 | 510–660 | 20 | ≥41 |
Delivery condition: Hot rolled, TMCP thermo-mechanical controlled rolling, normalizing. Heat treatment delivery for thick plates and low-temperature service to stabilize toughness.
6. Optional Surface Treatments
Hot Rolled Black Surface: Economical base type for internal non-exposed hull structures
Shot Blasting + Shop Primer: Main export standard, removes oxide scale, complies with IMO PSPC ballast tank coating specification, short-term anti-rust for sea transit
Reinforced Anti-Rust Primer: For long-distance ocean shipping and outdoor storage, extended anti-corrosion service life
7. Core Product Advantages
Stable Low-Temperature Toughness: Graded impact grades cover 0℃~-60℃, resisting low-temperature brittle fracture in polar and northern sea areas
Superior Marine Corrosion Resistance: Low impurity & corrosion-resistant micro-alloy formula, long-term resistance to seawater, salt fog and cabin moisture erosion
Excellent Weldability: Low carbon equivalent, compatible with SAW, GMAW, MMAW and other mainstream ship welding processes, welds free of pores and cracks
Strong Fatigue & Load-Bearing Capacity: Uniform stable mechanical properties, resisting continuous wave impact and cargo extrusion to avoid deformation of keels and bottom plates
Wide Machining Compatibility: Supports roll forming, bending, flame & plasma cutting, perfectly suited for curved hull shell manufacturing
Full Classification Society Certification: Original mill test certificate & classification society document supplied per batch, directly approved by shipyards and maritime authorities for customs clearance worldwide
8. Main Application Fields
8.1 Ocean-Going Shipbuilding (Core Application)
Bulk carriers, container ships, oil tankers, chemical tankers, ro-ro vessels: bottom plates, side shell plates, strength decks, keels, frames, longitudinal girders, cargo hold bulkheads, hatch coamings, watertight door frames.
8.2 Inshore & Coastal Vessels
Fishing boats, small transport ships, engineering vessels: superstructure, decks, internal partitions, equipment supports.
8.3 Offshore Engineering Equipment
Offshore drilling platforms, jacket structures, wind power foundation platforms, floating oil storage tanks, load-bearing trusses, desalination pressure structures.
8.4 Special Vessels
Icebreakers, polar transport vessels, salvage ships, port floating cranes: key high-strength load-bearing structural components.
9. Packaging, Marking & Delivery Terms
Seaworthy Export Packaging: Steel plates separated by wooden skids, tightly bundled with steel strips, edge iron protectors equipped. Anti-rust shop primer coated on surface, fully waterproof to avoid scratch and rust during long ocean transit.
Plate Marking: Double-sided spray marking on each plate, indicating classification society grade, thickness & width, heat number, UT testing grade, Z-direction performance, impact temperature and executive standard. Original Mill Test Certificate & classification society documents attached for each batch.
Lead Time: 7–10 days for regular stock; 12–20 days for customized ultra-high strength, Z-direction steel, Grade Ⅰ UT inspection and special thickness plates.
Logistics & Shipment: Loading at Tianjin Port, full truck or 40HC container export, FOB Tianjin / CFR / CIF trade terms acceptable.
10. Storage, Machining & Operation Precautions
Warehouse must be dry and ventilated; avoid long-term outdoor rain exposure, which degrades low-temperature impact performance and UT inspection pass rate.
Stack horizontally separated by wooden skids to prevent scratch of anti-rust primer from direct plate friction.
Calculate minimum bending radius before hull roll forming & bending; avoid excessive cold extrusion cracking for high-strength grades.
Preheating & post-weld stress relief heat treatment is mandatory for thick plates and Z-direction steel to prevent lamellar tearing.
Re-shot blasting & supplementary anti-rust primer coating, plus impact performance retest for inventory stored over 6 months.
Follow IMO PSPC coating standard for ballast tank and cargo oil tank construction, match dedicated marine topcoat system on shop primer.
11. Quality Assurance
Complete original Mill Test Certificate (MTC) supplied per batch, including full test data of chemical composition, tensile test, low-temperature impact test and ultrasonic inspection. Third-party inspection reports from SGS & BV available, products comply with ISO9001 quality management system. Full set of classification society certificates support customs clearance at global ports.
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