DH32 Shipbuilding Steel Plate

⚙️ DH32 Steel Plate: Key Facts at a Glance

🔬 Grade Designation

D: Grade of quality, impact at -20°C |   H: High strength |  32: Yield strength grade, ≥315Pa Yield Strength

📊 Core Performance

• Strength: Yield ≥315 MPa
• Toughness: -20°C Impact Test

🌍 Primary Applications

Hull structures for vessels operating in cold waters, decks, bulkheads, marine structures in temperate to cold climates.

✅ Certifications & Standards

Complies with ABS, BV, CCS, DNV, etc. 9 major classification societies, EN 10204 3.1 certificate.

🔍 Quick Specs Summary: DH32 Steel Plate

  • Grade & Strength: DH32, 32 Class High Strength Steel
  • Yield Strength (ReH): ≥ 315 MPa
  • Impact Toughness: Tested at -20°C (-4°F)
  • Key Property: Excellent Low-Temperature Toughness and Weldability
  • Primary Use: Hull structures, decks, bulkheads of vessels operating in cold waters
  • Service Environment: Cold marine service, temperate to cold climate regions
  • Approvals: ABS, BV, CCS, DNV, LR, NK, RINA, KR, IRS
  • Delivery Condition: Normalized (N) or TMCP

DH32 shipbuilding steel plate is a high-strength hull structural steel with enhanced low-temperature toughness, designed for marine applications in cold climate regions. It offers reliable -20°C impact performance combined with 315 MPa yield strength, making it ideal for vessels operating in temperate to cold waters.

1. Product Definition and Classification

DH32 belongs to the 32 Class high-strength hull structural steel family with a minimum yield strength of 315 MPa. The prefix D indicates impact testing at -20°C in accordance with classification society rules, providing enhanced low-temperature toughness. The letter H designates steel for hull structural applications.

Applicable Classification Societies

  • ABS – American Bureau of Shipping (United States)
  • BV – Bureau Veritas (France)
  • CCS – China Classification Society (China)
  • DNV – Det Norske Veritas (Norway)
  • IRS – Indian Register of Shipping (India)
  • KR – Korean Register (South Korea)
  • LR – Lloyd's Register (United Kingdom)
  • NK – ClassNK (Japan)
  • RINA – Registro Italiano Navale (Italy)

Note: Listed in alphabetical order by society abbreviation for neutral reference.

2. Key Advantages

⚓ Cold Climate Performance 🧱 Standard High Strength ❄️ Enhanced Low-Temperature Toughness 🔧 Excellent Fabrication Properties
Specifically designed for vessels operating in cold waters and temperate climates 315 MPa minimum yield strength provides optimal balance of strength and toughness Maintains stable impact toughness at -20°C for reliable cold climate performance Superior weldability and formability for efficient shipyard fabrication in various climates

3. Chemical Composition & Mechanical Properties

Chemical Composition (Typical, %)

C Si Mn P S Al
≤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

Thickness (mm) Yield Strength (MPa) Tensile Strength (MPa) Elongation (%) Impact Test Temperature
≤50 ≥315 440 – 590 ≥22 -20°C

4. D-Grade Hull Steel: Strength Grade Comparison

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 (Min) Typical Application Environment
DH32 -20°C ≥ 315 MPa Vessels operating in temperate to cold climate waters
DH36 -20°C ≥ 355 MPa Higher strength vessels operating in cold waters
DH40 -20°C ≥ 390 MPa High-strength vessels operating in cold climate regions

5. 32-Class Hull Steel: Toughness Grade Comparison

This table compares different toughness grades within the 32 Class high-strength hull steel series. All grades share the same minimum yield strength (≥315 MPa) but are designed for different service temperatures.

Performance Tier Steel Grade Yield Strength (Min) Impact Test Temperature Key Selection Insight
Tier 1: Standard Temperature AH32 ≥ 315 MPa 0°C Standard strength for general marine service in moderate climates
Tier 2: Enhanced Low-Temperature DH32 ≥ 315 MPa -20°C Recommended choice for vessels operating in cold waters with -20°C impact requirements
Tier 3: Superior Low-Temperature EH32 ≥ 315 MPa -40°C For vessels operating in very cold waters or arctic conditions

Choose Your Optimal Marine Steel Grade

Compare key specifications across our low-temperature toughness series. Varying parameters are highlighted for quick decision-making.

AH32

STANDARD
Yield Strength ≥315 MPa
Impact Temp 0°C
Key Feature General Marine

DH32

CURRENT RECOMMENDATION
Yield Strength ≥315 MPa
Impact Temp -20°C
Key Feature Cold Climate

EH32

LOW TEMP
Yield Strength ≥315 MPa
Impact Temp -40°C
Key Feature Arctic Service

DH36

ENHANCED
Yield Strength ≥355 MPa
Impact Temp -20°C
Key Feature Higher Strength

6. Typical Applications

Hull structures of vessels operating in cold waters (North Atlantic, Baltic Sea, cold climate regions)

Decks and bulkheads in marine engineering for cold climate service

Marine structural components requiring -20°C impact toughness

Vessels operating in temperate to cold climates with seasonal temperature variations

7. Available Sizes & Supply Conditions

Thickness: 6 – 150 mm

Width: Up to 5,300 mm

Length: Up to 18,000 mm

Delivery Condition: Normalized (N) / Thermo-Mechanical Control Processed (TMCP)

Surface Treatment: As rolled, blasted, or primed (upon request)

8. Quality Control & Certification

Inspection & Quality Control

Chemical composition analysis

Tensile and elongation testing

Charpy V-notch impact testing at -20°C

Ultrasonic testing (UT) for internal quality

Third-party inspection available (SGS, BV, TUV, etc.)

Certification

Each shipment includes:

EN 10204 3.1 mill test certificate

Classification society approval certificate

Heat number traceability

Optional EN 10204 3.2 certificate (upon request)

9.Frequently Asked Questions

DH32 is primarily used for hull structures, decks, bulkheads, and marine components of vessels operating in cold waters and temperate to cold climate regions where -20°C impact toughness is required.

The main difference is impact test temperature. AH32 is tested at 0°C, while DH32 is tested at -20°C. Both have the same yield strength (≥315 MPa), but DH32 provides enhanced low-temperature toughness for vessels operating in colder waters.

DH32 is impact tested at -20°C (-4°F) in accordance with classification society requirements for cold climate marine service conditions.

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.

Yes, we can supply DH32 plates with certifications from major classification societies including ABS (American Bureau of Shipping), BV (Bureau Veritas), DNV (Det Norske Veritas), LR (Lloyd's Register), GL (Germanischer Lloyd), 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.

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.

Yes, we specialize in customized solutions. We can supply DH32 plates according to your specified dimensions, thicknesses, and classification society requirements. 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 shipbuilding steel plates between 10-50mm, and we can basically provide them according to the quantity you need.

The price of DH32 steel plate fluctuates based on raw material costs, thickness, dimensions, purchase volume, and market conditions. 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.

We maintain strategic inventory of D-grade ship plates including DH32. The inventory we maintain is often the portion exceeding specific customer orders. For accurate real-time stock levels of DH32, please contact our sales team or use our stock inquiry system.

Request Technical & Commercial Support

We supply classification-approved DH32 shipbuilding steel plate with -20°C impact toughness, full traceability, flexible inspection options, and coordinated logistics support.

📋 Certification & Quality

9 major classification societies

EN 10204 3.1 certificates

-20°C impact test documentation

⚙️ 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