DH36 Shipbuilding Steel Plate: High Strength Hull Structural Steel for Marine Applications
IACS Certified 355 MPa Yield Strength Steel with -20°C Impact Toughness
DH36 shipbuilding steel plate is an internationally standardized marine grade steel under the IACS system, specifically engineered for hull structural applications requiring enhanced low-temperature toughness. This high-strength steel combines a minimum yield strength of 355 MPa with reliable impact performance at -20°C, making it the preferred material choice for vessels operating in temperate to cold marine environments.
As a member of the 36-class high-strength hull steel family, DH36 represents the optimal balance between structural integrity, weldability, and low-temperature toughness. The "D" designation indicates its -20°C impact testing requirement, while "H" specifies its hull structural application, and "36" denotes its 355 MPa (36 kgf/mm²) minimum yield strength.
DH36 Steel Plate Key Specifications
Strength Grade
DH36 / 36 Class
High Strength Hull Steel
Yield Strength
≥ 355 MPa
Minimum Requirement
Impact Toughness
-20°C Test
Charpy V-notch Standard
Delivery Condition
AR / Normalized (N) or TMCP Process
1. DH36 Product Classification and International Standards
International Classification System
DH36 is a standardized shipbuilding steel grade recognized by all member societies of the International Association of Classification Societies (IACS). Unlike domestic steel grades limited to specific countries, DH36 represents a universally accepted specification for marine structural applications, ensuring consistent material performance and certification across global shipbuilding projects.
DH36 Naming Convention Breakdown:
- D - Designates impact testing at -20°C temperature
- H - Identifies steel for Hull structural applications
- 36 - Indicates minimum yield strength of 355 MPa (36 kgf/mm²)
International Classification Society Approvals
DH36 steel plates are certified and approved by all major international classification societies, ensuring global acceptance for marine construction projects:
American Bureau of Shipping
United States
Bureau Veritas
France
China Classification Society
China
Det Norske Veritas
Norway
Lloyd's Register
United Kingdom
ClassNK
Japan
Registro Italiano Navale
Italy
Korean Register
South Korea
Indian Register of Shipping
India
Note: In practical applications and certification documents, DH36 is typically prefixed with the specific classification society abbreviation (e.g., ABS DH36, BV DH36, CCS DH36, DNV DH36) to indicate compliance with that society's specific rules and approval requirements.
Primary Application Areas
Hull Structures
Main hull plating, frames, and longitudinal members
Deck Components
Main deck plating, deckhouse structures
Bulkheads
Watertight and non-watertight divisions
Cold Climate Vessels
Ships operating in cold marine environments
2. Key Advantages of DH36 Steel Grade
| Steel Grade | 🏗️ Balanced Strength Performance | ❄️ Cold Climate Toughness | ⚓ Marine Durability | 🔧 Excellent Fabrication Properties |
|---|---|---|---|---|
| DH36 Marine Steel | 355 MPa minimum yield strength provides optimal balance of strength and toughness for demanding marine applications | Maintains stable impact toughness at -20°C for reliable cold climate performance | Specifically designed for medium-high strength vessels operating in cold waters and challenging marine environments | Superior weldability and formability for efficient shipyard fabrication in various climates |
3. Chemical Composition & Mechanical Properties of DH36 Steel
Chemical Composition (Typical, %)
| C Carbon |
Si Silicon |
Mn Manganese |
P Phosphorus |
S Sulfur |
Al Aluminum |
|---|---|---|---|---|---|
| ≤0.18 | ≤0.50 | 0.90 – 1.60 | ≤0.035 | ≤0.035 | ≥0.015 |
* Typical values according to classification society specifications. Actual limits may vary by approval.
Mechanical Properties of DH36 Steel
| Thickness (mm) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Impact Test Temperature |
|---|---|---|---|---|
| ≤50 mm | ≥355 MPa | 490 – 630 MPa | ≥21% | -20°C |
4. D-Grade Hull Steel: Strength Grade Comparison for Marine Applications
The following table compares different strength grades within the D-Grade hull steel series (all grades impact tested at -20°C), illustrating available options for increasing load-bearing capacity while maintaining the same -20°C impact toughness.
| Steel Grade | Impact Test Temperature | Yield Strength (Minimum) | Typical Application Environment |
|---|---|---|---|
| DH36 | -20°C | ≥ 355 MPa | Medium-high strength vessels operating in cold waters, ideal for balanced performance in shipbuilding and marine construction |
| DH32 | -20°C | ≥ 315 MPa | Vessels operating in temperate to cold climate waters, standard shipbuilding applications |
| DH40 | -20°C | ≥ 390 MPa | High-strength vessels operating in cold climate regions, ice-class vessels, heavy-duty marine applications |
5. 36-Class Hull Steel: Quality Grade Comparison for Different Temperature Requirements
This table compares different quality grades within the 36 Class high-strength hull steel series. All grades share the same minimum yield strength (≥355 MPa) but are designed for different service temperatures and marine environments.
| Quality Grade | Steel Grade | Yield Strength (Minimum) | Impact Test Temperature | Key Selection Insight |
|---|---|---|---|---|
| Enhanced Low-Temperature | DH36 | ≥ 355 MPa | -20°C | Recommended choice for medium-high strength vessels operating in cold waters with -20°C impact requirements. Optimal balance of strength and toughness for shipbuilding applications. |
| Standard Temperature | AH36 | ≥ 355 MPa | 0°C | Standard medium-high strength for demanding marine service in moderate climates and standard shipbuilding requirements |
| Superior Low-Temperature | EH36 | ≥ 355 MPa | -40°C | For medium-high strength vessels operating in very cold waters or arctic conditions, specialized marine applications |
Choose Your Optimal Marine Steel Grade
Compare key specifications across similar grades. Varying parameters are highlighted for quick decision-making.
6. Typical Applications of DH36 Marine Steel Plate
7. Available Sizes & Supply Conditions for DH36 Steel Plate
Dimensions
Thickness: 6 – 150 mm
Width: Up to 5,300 mm
Length: Up to 18,000 mm
Supply Conditions
8. Quality Control & Certification for DH36 Marine Steel
Inspection & Quality Control
Certification & Documentation
Each shipment includes comprehensive documentation:
9. Why Choose CEHE Steel for Your Marine Steel Needs?
Discover how our expertise, resources, and commitment make us the preferred partner for marine steel solutions worldwide.
10.Frequently Asked Questions
Request Technical & Commercial Support
We supply classification-approved DH36 medium-high strength shipbuilding steel plate with -20°C impact toughness, 355 MPa yield strength, full traceability, flexible inspection options, and coordinated logistics support.
📋 Certification & Quality
9 major classification societies
EN 10204 3.1 certificates
355 MPa yield strength verification
⚙️ Custom Solutions
Custom dimensions & cutting
Various surface treatments
Flexible certification options
🚚 Logistics Support
Global shipping coordination
Documentation assistance
Technical support
Response Time: We typically respond to all inquiries within 24 hours