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Ship Plate Product Detailed Description
Ship plate is hot-rolled steel plate produced in accordance with classification society specifications for manufacturing hull and marine engineering structures. It features high strength, high toughness, excellent weldability and corrosion resistance, and is certified by mainstream classification societies including CCS, ABS and BV.
1. Core Classification and Grades
Classified into two main categories by strength and quality grade; grade rule: Strength + Quality Grade (e.g., AH36, EH36).
1.1 Normal Strength Ship Plate (Yield Strength ≥ 235MPa)
Grades: A, B, D, E (corresponding to CCSA/CCSB/CCSD/CCSE).
Characteristics: Low-temperature toughness increases progressively; impact temperatures are normal temperature, 0℃, -20℃ and -40℃ respectively.
Application: Inland river ships, coastal bulk carriers, superstructures and other low-load areas.
1.2 High Strength Ship Plate (Yield Strength 315–355MPa)
Strength Levels: 32 (≥315MPa), 36 (≥355MPa), 40 (≥390MPa).
Quality Grades: A, D, E, F (Impact temperature: Normal temperature / -20℃ / -40℃ / -60℃).
Typical Grades: AH32/DH32/EH32/FH32, AH36/DH36/EH36/FH36.
Application: Large container ships, oil tankers, LNG carriers, polar ships, offshore platforms and other key load-bearing parts.
1.3 Z-Direction Ship Plate (Lamellar Tear Resistant)
Grades: Z15, Z25, Z35 (Thickness direction reduction of area ≥15%/25%/35%).
Application: Hull joints, platform legs and other thick-plate high-stress areas.
2. Typical Chemical Composition (GB/T 712-2022)
| Element | Normal Strength (A/B/D/E) | High Strength (AH36/EH36) |
|---|---|---|
| C | ≤0.18% | ≤0.20% |
| Si | ≤0.50% | ≤0.50% |
| Mn | 0.70–1.20% | 0.90–1.60% |
| P/S | ≤0.035% | ≤0.035% |
| Micro-alloy | Nb/V/Ti (Trace) | Nb+V+Ti ≤0.12% |
Carbon equivalent Ceq≤0.36% (≤50mm), ensuring good weldability.
3. Mechanical Properties (Core Indicators)
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Impact Requirement (Longitudinal) |
|---|---|---|---|
| A/B/D/E | ≥235 | 400–520 | A/B Normal Temp ≥34J; D -20℃≥34J; E -40℃≥34J |
| AH32/DH32/EH32 | ≥315 | 440–570 | A Normal Temp ≥34J; D -20℃≥34J; E -40℃≥34J |
| AH36/DH36/EH36 | ≥355 | 490–620 | A Normal Temp ≥34J; D -20℃≥34J; E -40℃≥34J |
4. Specification Range
Thickness: 6–200mm (Common size: 8–50mm)
Width: 1500–4020mm
Length: 3000–27000mm, fixed length / multiple length available
Delivery Condition: Hot Rolled, Normalized, TMCP, Quenched & Tempered
5. Execution Standard & Certification
National Standard: GB/T 712-2022 Structural Steel for Ships and Marine Engineering
Classification Society Certification: CCS, ABS, BV, DNV, LR and other international certifications
Ultrasonic Testing: JB/T 4730, GB/T 2970 (Grade Ⅰ/Ⅱ/Ⅲ)
6. Main Applications
Normal Strength (A/B/D/E): Hull superstructure, deck, bulkhead, inland river ship shell.
High Strength (AH36/EH36): Hull outer plate, bottom plate, side plate, keel, large hatch cover, offshore platform jacket.
Low Temperature Resistant (EH/FH): Polar navigation ships, ice-strengthened structures, LNG cargo tanks.
7. Quality Characteristics & Advantages
High Toughness: Stable low-temperature impact energy, avoiding brittle fracture, suitable for extreme cold environment from -40℃ to -60℃.
Excellent Weldability: Low carbon equivalent, low welding crack sensitivity, suitable for high-strength welding of hulls.
Fatigue & Corrosion Resistance: High steel purity (low S/P), lamellar tear resistance (Z-direction grade), good seawater corrosion resistance, extending ship service life.
Complete Specifications: Customized thickness, width and length to meet demands of different hull parts.
8. Packaging & Delivery
Packaging: Bare bundle with anti-rust paint; marked with Grade, Specification, Heat No., Classification Society Logo at both ends.
Delivery Time: 5–7 days for conventional sizes, shipped from Tianjin Port.
Quality Documents: Provide Classification Society Certificate, Material Test Report, Ultrasonic Testing Report.
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