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:

ABS

American Bureau of Shipping

United States

BV

Bureau Veritas

France

CCS

China Classification Society

China

DNV

Det Norske Veritas

Norway

LR

Lloyd's Register

United Kingdom

NK

ClassNK

Japan

RINA

Registro Italiano Navale

Italy

KR

Korean Register

South Korea

IRS

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.

Comparison of D-Grade Marine Steel Plates for Shipbuilding Applications
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.

Comparison of 36-Class Steel Quality Grades for Different Marine Service Temperatures
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.

DH36

CURRENT GRADE
Impact Test
-20°C
≥34J
Tensile Strength 490-630 MPa
Yield Strength (Min) ≥355 MPa
Key Feature Balanced Performance

AH36

STANDARD
Impact Test
0°C
≥34J
Tensile Strength 490-630 MPa
Yield Strength (Min) ≥355 MPa
Key Feature Standard Marine

EH36

LOW TEMP
Impact Test
-40°C
≥31J
Tensile Strength 490-630 MPa
Yield Strength (Min) ≥355 MPa
Key Feature Arctic Service

FH36

SUPER LOW
Impact Test
-60°C
≥27J
Tensile Strength 490-630 MPa
Yield Strength (Min) ≥355 MPa
Key Feature Extreme Cold

DH32

STANDARD
Impact Test
-20°C
≥34J
Tensile Strength 440-590 MPa
Yield Strength (Min) ≥315 MPa
Key Feature Standard Strength

DH40

HIGH STRENGTH
Impact Test
-20°C
≥34J
Tensile Strength 510-650 MPa
Yield Strength (Min) ≥390 MPa
Key Feature High Strength

6. Typical Applications of DH36 Marine Steel Plate

Medium-high strength hull structures of vessels operating in cold waters (North Atlantic, Baltic Sea, Arctic regions, cold climate marine environments)
Decks and bulkheads in marine engineering requiring balanced strength and cold climate performance for shipbuilding applications
Marine structural components requiring both 355 MPa yield strength and -20°C impact toughness in harsh marine conditions
Vessels operating in temperate to cold climates where optimal strength-to-toughness ratio is critical for safe marine operations
Offshore structures in cold climate regions demanding balanced strength performance for oil and gas platforms

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

Delivery Condition: Normalized (N) / Thermo-Mechanical Control Processed (TMCP)
Surface Treatment: As rolled, blasted, or primed (upon request)
Standards: ASTM A131, EN 10025-3, JIS G3106

8. Quality Control & Certification for DH36 Marine Steel

Inspection & Quality Control

Chemical composition analysis and verification
Tensile and elongation testing for mechanical properties
Charpy V-notch impact testing at -20°C for toughness verification
Ultrasonic testing (UT) for internal quality assessment
Third-party inspection available (SGS, Bureau Veritas, TÜV, DNV, etc.)

Certification & Documentation

Each shipment includes comprehensive documentation:

EN 10204 3.1 mill test certificate with full test results
Classification society approval certificate (ABS, LR, BV, DNV, etc.)
Heat number traceability for full material history
Optional EN 10204 3.2 certificate available upon request

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.

Powerful Resource Network and End-to-End Supply Assurance

We have established strategic partnerships with multiple leading Chinese steel mills, enabling us to offer tailored solutions and ensure complete supply chain control from raw materials to finished products.

Resource & Dimensions
Thickness: 6-150mm, Width: up to 5300mm, Length: up to 18000mm
Strategic Inventory
Key grades in stock, custom cutting available, fastest delivery within 15 days
Global Logistics
Professional packaging with real-time tracking worldwide
Supply Chain Control
Complete control from raw materials to finished products

Comprehensive Quality System and Transparent Traceability

We implement a quality control and traceability system that exceeds standard requirements, ensuring every steel plate we supply is reliable, compliant, and fully documented.

Full Certification
Meets ABS, DNV, GL, LR, BV, CCS, NK, RINA, KR standards
Stringent Inspection
Third-party inspection support (SGS, BV) with rigorous internal QC
Complete Traceability
Unique heat number tracking from mill to project
Quality Standards
EN 10204 3.1/3.2 certificates with every shipment

Technical Expertise and Comprehensive Project Support

We position ourselves not just as material suppliers but as technical partners, offering complete service from material selection through to final delivery and beyond.

Expert Consultation
Free technical guidance on material selection, welding, fabrication
Project Follow-up
Immediate response, risk assessment, contract review, production tracking
Value-Added Services
Export documentation, logistics arrangement, inspection coordination
Continuous Support
From order confirmation to post-installation

Proven Experience and Global Trust Since 2009

Since our founding in 2009, we have built deep expertise in marine steel applications and validated our capabilities through successful projects worldwide.

Industry Experience
Focused exclusively on marine steel since 2009
Global Performance
Successfully supplied major shipbuilding and offshore projects worldwide
Trusted Partner
Long-term relationships with marine plate distributors and manufacturers
Project Validation
Validated capabilities through successful global projects

10.Frequently Asked Questions

DH36 is primarily used for medium-high strength hull structures, decks, bulkheads, and marine components of vessels operating in cold waters. It is ideal for applications requiring balanced performance with 355 MPa yield strength and reliable -20°C impact toughness in cold climate regions.

The main difference is yield strength. Both DH32 and DH36 are impact tested at -20°C, but DH32 has a minimum yield strength of 315 MPa, while DH36 has a higher minimum yield strength of 355 MPa. DH36 provides better load-bearing capacity for applications requiring more strength while maintaining the same cold temperature toughness.

DH36 is impact tested at -20°C (-4°F) in accordance with classification society requirements for cold climate marine service conditions, same as DH32 and DH40 but with medium-high strength.

We provide EN 10204 3.1 mill test certificates along with classification society approval certificates for each shipment, including specific documentation for -20°C impact testing and 355 MPa yield strength verification.

Yes, we can supply DH36 plates with certifications from major classification societies including ABS (American Bureau of Shipping), BV (Bureau Veritas), DNV (Det Norske Veritas), LR (Lloyd's Register), CCS (China Classification Society), NK (Nippon Kaiji Kyokai), KR (Korean Register), and RINA. We can work with your designated classification society to meet specific project requirements for medium-high strength applications.

Yes, we can arrange third-party inspections from organizations like SGS, Bureau Veritas, TUV, or Lloyd's Register upon customer request, including verification of -20°C impact test results and 355 MPa yield strength testing.

Yes, we specialize in customized solutions. We can supply DH36 plates according to your specified dimensions, thicknesses, and classification society requirements for medium-high strength applications. We also provide EN 10204 3.2 certificates upon request.

Delivery time for customized orders: Approximately 20 days for hot-rolled plates and 35-55 days for normalized plates, depending on specifications.

We offer flexible MOQ options. For hot-rolled plates, typical lead time is around 20 days. For normalized plates, expect 35-55 days depending on specifications and quantity. We do not have a mandatory requirement for the minimum order quantity of medium-high strength shipbuilding steel plates between 10-50mm, and we can basically provide them according to the quantity you need.

The price of DH36 steel plate fluctuates based on raw material costs, thickness, dimensions, purchase volume, and market conditions. DH36 typically commands a moderate premium over DH32 due to its higher strength specifications. For the most accurate and competitive real-time quotation, please contact our sales team with your specific requirements (grade, size, quantity, destination port, and any special certifications needed). We provide competitive pricing and respond within 24 hours.

For marine steel plates (including DH36), our business strategy is customization-oriented, supplemented by spot inventory. To be factual, we maintain spot inventory of various materials in our warehouse, though the stock is not comprehensive—typically ranging from 500 to 1,200 tons per month. Given the specific requirements of shipbuilding plates in terms of classification society certifications, dimensions, and specifications, we do not intentionally stockpile inventory for any particular specification. (Our inventory is generated when a customer's customized order falls short of the mill's minimum order quantity, and we supplement the balance to fulfill the order.) If you happen to have a spot requirement, feel free to click here to check our current inventory.→ stock inquiry system.

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