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DH550 | High-Strength Shipbuilding Steel

DH550 | High-Strength Shipbuilding Steel

SteelPRO Group offers DH550 high-strength shipbuilding steel plates in stock.

Class Cert.: ABS/BV/CCS/DNV/KR/LR/NK/RINA/RS/PRS
Material: High-Strength Low-Alloy Steel
Thickness: 6-50 mm, or customized
Width: 900-4800 mm, or customized
Length: 3000-25000 mm, or customized
Condition of Delivery: A/HR/N/CR/Q+T/TMCP, or as request
Additional Requirements: Z-Direction Performance (Z15, Z25, Z35), UT Testing, Impact Toughness Test, etc.
Stock: In stock
Origin: Hebei/Henan/Jiangsu, China
Port: Qingdao

Looking for other Grade 550 high-strength steel?
Click here for FH550.

Description

What Is DH550?

DH550 steel is a high-strength, low-alloy structural steel primarily used in shipbuilding and offshore applications. “D” stands for toughness rating at -20°C, while “H” signifies high yield strength (≥550MPa). It offers a balance of excellent strength, low-temperature toughness, and resistance to corrosion, suitable for challenging marine environments.

Key features include good weldability, enhanced durability under dynamic loads, and resistance to deformation even under extreme conditions. DH550 maintains structural integrity in both sub-zero temperatures and harsh weather, ensuring long service life. Typical applications include ship hulls, offshore platforms, drilling rigs, and other heavy-duty marine structures that demand high strength, toughness, and reliability.

Characteristics of DH550

  • Enhanced structural stability and load capacity.
  • Excellent ductility for superior formability.
  • Exceptional fatigue resistance for high-stress applications.
  • Lightweight design to reduce weight and optimize material usage.
  • Outstanding corrosion resistance against harsh environments.

Chemical Compositions

ElementMax %
Carbon, C0.20
Manganese, Mn1.70
Silicon, Si0.10 – 0.55
Sulfur, S0.030
Phosphorus, P0.030
Copper, Cu0.35
Chromium, Cr0.20
Nickel, Ni0.40
Molybdenum, Mo0.08
Aluminum, Al0.020 min
Niobium, Nb0.20 – 0.05
Vanadium, V0.05 – 0.10
Titanium, Ti0.0007 – 0.05
Nitrogen, N

Physical Properties

PropertyMetricImperial
Density~7,800 kg/m³~0.282 lb/in³
Melting Point~1,490 – 1,520 °C~2,714 – 2,768 °F
Thermal Conductivity~50 W/m·K~29 BTU/h·ft·°F
Electrical Conductivity~7-10% IACS (compared to copper)~7-10% IACS
Specific Heat Capacity~460 J/kg·K~0.11 BTU/lb·°F
Thermal Expansion Coefficient~12 x 10⁻⁶ /K~6.7 x 10⁻⁶ /°F
Electrical Resistivity~0.20 μΩ·m~79 μΩ·in

Mechanical Properties

Thickness (mm)Yield (Min MPa)Tensile (MPa)Elongation (Min %)Test Temperature (°C)Charpy V Impact Test Transverse (J)Charpy V Impact Test Longitudinal (J)
≤ 150550670 – 83016%-203755

Industries & Applications

IndustryApplication
MarineHull structures, Offshore platforms, Decks, Bulkheads
AutomotiveChassis components, Structural beams, Reinforcement parts, Suspension systems
ConstructionBridges, Structural frameworks, High-rise building reinforcements, Crane components
EnergyWind turbine towers, Oil rigs, Transmission towers, Power plant frameworks

Machining

Heat Treatment

  • Preheating: Heat to 300–500°C (572–932°F) to reduce thermal shock.
  • Austenitizing: Heat to 900–950°C (1652–1742°F) and hold until uniform temperature is achieved.
  • Quenching: Rapidly cool in water or oil to room temperature to form martensite.
  • Tempering: Reheat to 500–700°C (932–1292°F) to achieve desired hardness and reduce brittleness. Hold for 1–2 hours, then air-cool.
  • Post-Treatment Check: Verify hardness and microstructure through testing for quality assurance.

Surface Treatment

  • Shot Blasting: Removes surface impurities and enhances adhesion for coatings.
  • Galvanizing: Applies a zinc layer to prevent corrosion.
  • Powder Coating: Provides a durable, protective, and decorative finish.
  • Anodizing: Enhances corrosion resistance and surface hardness.
  • Chemical Treatment: Uses phosphating or passivation to improve corrosion resistance.

*Customization is available upon request.

Our Service

SteelPRO Group – manufacturer and solution provider for special steel, offering multi-industry application solutions and customised services, 100% quality free, accompanying customers in their growth!

Our Quality Control

  • Roundness
  • Tolerance
  • Microstructure
  • Non-Destructive Testing
  • Destructive Testing
  • Process Control

Service Integration Processing

  • Welding
  • Metal Fabrication
  • CNC Machining
  • Lathe
  • Forming

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