Marine Z-direction steel plate is specially designed to resist lamellar tearing in the through-thickness (Z-direction), which can occur during welding of thick structural components. It offers enhanced ductility and strength in the Z-direction, making it ideal for critical load-bearing areas in shipbuilding and offshore structures.
These plates are commonly used in key structural joints, such as longitudinal and transverse welds in hulls, decks, and offshore platforms, where high through-thickness performance is required to ensure structural integrity and safety.
Product Information
| Item |
Details |
| Product Name |
Marine Z-Direction Steel Plate |
| Standards |
AISI, ASTM, DIN, JIS, GB |
| Grade |
AH36-Z25, AH36-Z35
DH36-Z25, DH36-Z35
EH36-Z25, EH36-Z35
Q345D-Z25, Q390D-Z35
S355J2+Z25, S355NL+Z35
|
| Classification Society Certifications |
CCS, ABS, DNV, LR, BV, GL, RINA, NK, KR |
| Material Type |
Carbon steel, high-strength low-alloy steel, stainless steel, aluminum alloy, composite materials |
| Length |
Up to 12000 mm (or as required) |
| Width |
1500 mm – 3000 mm |
| Thickness |
6 mm – 120 mm (common: 6–50 mm for hull; thicker for tankers) |
| Application |
Hull structures, ship equipment, cargo decks, offshore platforms, marine machinery, tankers, high-speed vessels |
| Export Packing |
Waterproof paper + steel strip bundle; seaworthy packaging for all transport |
| Payment Terms |
T/T (telegraphic transfer) |
| Delivery Time |
30–60 days depending on grade and production plan |
Typical Grades & Applications
| Grade Type |
Common Grades |
Typical Use |
| Ordinary Strength |
A, B, D, E |
Non-critical parts: cargo hold, deck, bottom plates |
| High Strength (AH) |
AH32, AH36, AH40 |
Hull structures, operating in low temperatures (−20℃) |
| High Strength (DH) |
DH32, DH36, DH40 |
-40℃ operating environments; improved toughness |
| High Strength (EH) |
EH32, EH36, EH40 |
Severe cold areas, icebreakers, offshore platforms |
| Stainless Steel |
304L, 316L |
Chemical tankers, food transport ships |
| Aluminum Alloy |
5083, 5052 |
Lightweight applications: yachts, patrol boats |
| Composite Material |
GRP (glass fiber reinforced plastic) |
Small boats, special use vessels |
Performance Characteristics
1. Mechanical Properties
• Yield Strength:
– Ordinary: ≥235 MPa
– High Strength: 315–390 MPa
• Tensile Strength: 400–620 MPa
• Elongation: ≥20%
• Impact Toughness: Maintains toughness at low temperatures (AH: −20℃, DH: −40℃, EH: −60℃)
2. Process Properties
• Weldability: Excellent welding characteristics, carbon equivalent <0.4%
• Formability: Cold bending, hot rolling, shearing, edge processing available
3. Corrosion Resistance
• Resistant to seawater and marine atmosphere
• Enhanced through alloying (e.g., Cu, Ni) or coatings (e.g., epoxy primer)
4. Temperature Resistance
• Withstands extreme temperatures:
– High-temperature zones (engine room)
– Arctic vessels (nickel alloys: −100℃)
Production Lines & Capabilities
- Advanced steel plate rolling lines for heavy and wide plates
- CNC plasma cutting, laser cutting, automatic beveling, surface blasting
- Ultrasonic flaw detection (UT), Magnetic particle inspection (MT)
- Coating line: primer + intermediate + topcoat, thickness 200–300μm
- OEM/ODM support, full customization available
Certifications
Classification Societies:
• ABS – American Bureau of Shipping
• LR – Lloyd's Register
• DNV-GL – Det Norske Veritas – Germanischer Lloyd
• CCS – China Classification Society
• BV, RINA, KR, NK, GL
International Standards:
• ISO 9001, ISO 14001, ISO 683-1
• IMO-SOLAS requirements (corrosion/fire protection)
• EEDI compliant for low-carbon and energy-efficient vessels
Packaging & Shipping
Packaging:
• Waterproof kraft paper
• Steel strips and corner protectors
• Wooden pallets if required
• Marking with heat number, steel grade, size, classification approval
Shipping:
• Container shipping (20GP/40GP)
• Bulk vessel shipment
• Strong partnerships with MSK, COSCO, CMA, APL, etc.
• FOB, CIF, CFR terms supported
Customer Concerns
1. Our Thickness and Specifications
• We recommend different thicknesses based on the part of the ship.
• Hull shell thickness: 6–50 mm
• Bottom plate of large tankers: over 30 mm
• Standard dimensions: width 1.5–3 m, length up to 12 m
2. Our Surface Treatment
• Plates are derusted (e.g., Sa2.5 grade sandblasting)
• Coated with primer, intermediate paint, and topcoat
• Typical coating thickness: 200–300 μm
3. Weight and Cost
• Lightweight design trend favors high-strength ship plates
• Example: Q460E can replace Q345D to reduce weight by up to 20%
4. Environmental Protection and Sustainability
• Compliant with EU’s EEDI for low-carbon materials
• Some plates made using recycled steel (e.g., scrap steel)
• Coating meets environmental standards (e.g., low VOC paint)
Pre-sale & After-sale Services
1. Pre-Sale
• Free samples (freight collect)
• Custom cutting, punching, marking
• Support for special grades or dimensions
2. During Production
• Real-time production updates
• Full traceability with heat number & mill certificate
• Third-party inspection (SGS, BV, TUV, ABS) available
3. After-Sale
• 3-year quality warranty
• Full set of technical documentation
• On-site welding and processing guidance (if required for large projects)
Sustainability & Environmental Commitment
- Use of recycled steel (e.g., scrap steel)
- Low-VOC coatings to reduce marine pollution
- Compliant with EU’s EEDI and IMO decarbonization goals
- Support for green shipping projects
