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AH40 | High-Strength Shipbuilding Steel

AH40 | High-Strength Shipbuilding Steel

SteelPRO Group provides AH40 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/TMPC, or as request
Stock: In stock
Origin: Hebei/Henan/Jiangsu, China
Port: Qingdao

Looking for other Grade 40 high-strength steel?
Click here for DH40/EH40/FH40.

Description

What Is AH40?

AH40 steel is a high-strength, high-toughness material widely used in shipbuilding and offshore structures. The “A” represents the quality grade, while “H” indicates high-strength steel, with “40” referring to a yield strength of 40 kgf/mm² (about 390 MPa).

It offers excellent corrosion resistance, tensile and bending strength, and good weldability, performing reliably in harsh marine conditions. This makes it suitable for applications like ship hulls, decks, and offshore platforms, where durability, impact resistance, and reduced maintenance are essential for long-term performance.

Characteristics of AH40

  • High strength and toughness
  • Excellent corrosion resistance
  • Good weldability and machinability
  • Strong resistance to bending, torsion, and impact
  • Reliable performance in harsh marine environments

AH40 Steel Manufacturer

SteelPro Group supplies AH40 steel certified by international classification societies. Our products include plates, bulb flats, L-sections, and T-sections, ensuring guaranteed safety and quality. We offer shot blasting, primer coating, and other corrosion-resistant finishes. With extensive experience in serving heavy-duty vessels such as tankers, container ships, and offshore support vessels, we look forward to collaborating with you!
    • Classifier: ABS, LR, CCS, KR, NK
    • Standard: ASTM A131, EN 10025
    • Certificate: EN 10204 Type 3.2
    • Impact Strength: 34 J at 0°C

Certifications

Our AH36 products comply with ASTM, ABS, CCS, NK, and KR certifications.

Chemical Compositions

ElementMax %
Carbon, C0.18
Silicon, Si0.5
Manganese, Mn0.90 – 1.60
Phosphorus, P0.03
Sulfur, S0.03
Aluminum, Als0.015
Niobium, Nb0.02 – 0.05
Vanadium, V0.05 – 0.10
Titanium, Ti0.02
Copper, Cu0.35
Chromium, Cr0.2
Nickel, Ni0.4
Molybdenum, Mo0.08

Physical Properties

PropertyMetricImperial
Density7,850 kg/m³0.284 lb/in³
Melting Point1,510 °C2,750 °F
Thermal Conductivity50 W/m·K289 BTU·in/hr·ft²·°F
Electrical Conductivity6.8 MS/m11.7% IACS
Specific Heat Capacity480 J/kg·K0.114 BTU/lb·°F
Thermal Expansion Coefficient12 x 10⁻⁶ /°C6.67 x 10⁻⁶ /°F
Electrical Resistivity145 nΩ·m1.45 μΩ·cm

Mechanical Properties

Thickness (mm)Yield Strength (MPa min.)Tensile Strength (MPa)Elongation (% min.)Test Temperature (°C)Impact Energy (KV J min.) Transverse/Longitudinal
≤50390510 – 65020027/41

Industries & Applications

IndustryApplication
ShipbuildingHulls, Decks, Bulkheads, Offshore Platforms
Marine EngineeringShip Frames, Submarines, Engine Foundations, Offshore Structures
Oil & GasOil Rigs, Pipelines, Drilling Platforms, Storage Tanks
Heavy Equipment ManufacturingCranes, Excavators, Loaders, Bulldozers

Machining

Heat Treatment

  • Normalizing: 900-950°C, air cool.
  • Stress Relieving: 540-600°C, hold for 1-2 hours, then air cool.
  • Quenching: 850-900°C, quench in water or oil.
  • Tempering: 550-650°C, depending on required properties.

Surface Finish

  • Polishing: Improves smoothness and shine.
  • Grinding: Removes material for a smooth finish.
  • Sandblasting: Produces a matte or textured surface.
  • Brushing: Creates a linear texture with a satin finish.
  • Anodizing: Increases corrosion resistance and surface hardness.
  • Plating: Adds a metal coating for enhanced durability or aesthetics.
  • Powder Coating: Provides a uniform, durable protective layer.
  • Passivation: Enhances corrosion resistance by removing contaminants.

*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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