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FH40 | High-Strength Shipbuilding Steel

FH40 | High-Strength Shipbuilding Steel

SteelPRO Group provides FH40 high-strength shipbuilding steel plates in stock.

Class Cert.: ABS/BV/CCS/DNV/KR/LR/NK/RINA/RS/PRS
Material: Low Alloy Steel
Thickness: 6mm-100mm, or customized
Width: 900mm-4800mm, or customized
Length: 3000mm-25000mm, or customized
Condition of Delivery: A/HR/N/CR/Q+T/TMCP, or as request
Stock: In stock
Origin: Hebei/Henan/Jiangsu, China
Port: Qingdao

Looking for other Grade 40 high-strength steel?
Click here for AH40/DH40/EH40.

Description

What Is FH40?

FH40 steel is a high-strength structural steel designed for shipbuilding and offshore engineering. Its key components—carbon, silicon, manganese, nickel, and chromium—provide excellent strength, toughness, corrosion resistance, and weldability. FH40 performs reliably in harsh marine conditions, handling heavy loads and low-temperature (down to -60℃) impacts. Common applications include offshore platforms, wind turbines, marine vessels, subsea pipelines, and other ocean engineering structures. Its durability and performance make it a critical material for ensuring safety and longevity in maritime projects.

Characteristics of FH40

  • High strength for heavy loads and structural support
  • Excellent toughness in low temperatures
  • Strong resistance to corrosion in marine environments
  • Good weldability for easy fabrication
  • Reliable performance in harsh offshore conditions

Chemical Compositions

ElementMax %
Carbon, C0.16
Manganese, Mn0.90 – 1.60
Silicon, Si0.50
Sulfur, S0.025
Phosphorus, P0.025
Copper, Cu0.35
Chromium, Cr0.20
Nickel, Ni0.40
Molybdenum, Mo0.08
Aluminum, Al0.0015 min
Niobium, Nb0.02 – 0.05
Vanadium, V0.05 – 0.10
Titanium, Ti0.02
Nitrogen, N0.009

Physical Properties

PropertyMetricImperial
Density7.85 g/cm³0.284 lb/in³
Melting Point1425 – 1470°C2597 – 2678°F
Thermal Conductivity50 W/m·K86 BTU·in/hr·ft²·°F
Electrical Conductivity6.2 x 10⁶ S/m6.2 x 10⁶ S/m
Specific Heat Capacity486 J/kg·K0.116 BTU/lb·°F
Thermal Expansion Coefficient12 x 10⁻⁶ /K6.7 x 10⁻⁶ /°F
Electrical Resistivity1.6 x 10⁻⁸ Ω·m1.6 x 10⁻⁸ Ω·m

Mechanical Properties

Thickness (mm)Yield Strength (MPa min.)Tensile Strength (MPa)Elongation (% min.)Test Temperature (°C)Impact Energy (KV J min.) Transverse/Longitudinal
≤50390510 – 65020-6027/41

Industries & Applications

IndustryApplications
ShipbuildingShip hulls, Deck structures, Bulkheads, Offshore platforms
Offshore EngineeringOil rigs, Marine pipelines, Jack-up rigs, Floating platforms
ConstructionBridges, High-rise buildings, Structural beams, Reinforced frames
Heavy MachineryCranes, Excavators, Loaders, Pressure vessels

Machining

Heat Treatment

  • Preheating: Heat to 600-650°C (1112-1202°F). Hold to ensure even heating.
  • Austenitizing: Increase to 870-900°C (1598-1652°F). Hold for uniform heating.
  • Quenching: Cool rapidly in water or oil to harden.
  • Tempering: Reheat to 550-650°C (1022-1202°F) to reduce brittleness.
  • Cooling: Let cool slowly to room temperature.

Surface Finish

  • Pickling: Removes scale and rust from the surface.
  • Shot Blasting: Cleans the surface and prepares it for further processing.
  • Painting: Adds a protective layer to prevent corrosion.
  • Galvanizing: Coats the steel with a layer of zinc to protect against rust.
  • Oil Coating: Applies a thin oil layer to prevent rust during storage.

*Customization is available upon request.

Disclaimer

The provided heat treatment and surface treatment processes are general guidelines. Actual conditions may vary depending on specific applications and requirements. It is recommended to consult with a professional metallurgist or material scientist to tailor the processes to your particular needs. The information herein is not a substitute for professional advice and should not be relied upon as such.

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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