FH36 Marine Steel Plate

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FH36 Shipbuilding Steel Plate: Overview, Properties, and Marine Applications

FH36 steel plate, a high-strength hull structural steel classified under the "F" grade series, is engineered for vessels operating in frigid climates. The "F" designation signifies its suitability for Arctic and sub-Arctic environments, requiring exceptional low-temperature impact toughness to prevent brittle fracture risks. The number "36" denotes a minimum yield strength of 355 MPa, balancing structural integrity with weldability and formability to meet diverse shipbuilding and offshore engineering demands.
FH36 shipbuilding steel plates can be used in the manufacture of the ship's hull structure whose weight is below 10000 tons.

FH36 Steel Specifications & Standards

Dimensions:

Thickness: 4–700 mm

Width: 1,200–4,000 mm

Length: 3,000–18,000 mm (customizable)

Standards: Compliant with GB/T 712 and international classification societies (CCS,DNV,GL,LR,BV,ABS,NK,KR,RINA,IRS).

Delivery Conditions: Hot-rolled, controlled rolling, normalizing, or quenched and tempered (TMPC).

Production Process & Quality Control

FH36 steel manufacturing involves:

Hot Metal Pretreatment: Impurity removal for raw material purity.

Converter Steelmaking & LF Refining: Precise alloying (Cu, Ni, Cr) for corrosion resistance.

Continuous Casting: Uniform slab formation.

Thermomechanical Rolling: Grain refinement via controlled rolling.

Quality Assurance:

Raw material screening and chemical analysis.

In-process monitoring of rolling parameters.

Final testing: Mechanical properties (tensile, Charpy V-notch at -60°C), metallography, and non-destructive testing (UT, MT).

Core Properties of FH36 Steel

High Strength:

Yield strength ≥355 MPa, tensile strength 490–630 MPa.

Superior Low-Temperature Toughness:

Impact energy ≥300 J at -60°C, preventing brittle fractures in polar regions.

Excellent Weldability:

Low carbon equivalent (Ceq ≤0.38%) minimizes cracking; weld joint properties closely match the base metal.

Corrosion Resistance:

Alloying elements (Cu, Ni, Cr) enhance seawater corrosion resistance, extending service life.

Eco-Friendly Production:

High scrap recycling rates and reduced emissions align with green manufacturing standards.

Applications of FH36 Steel

Shipbuilding:

Hulls, decks, and bulkheads of icebreakers, polar research vessels, and Arctic LNG carriers.

Ensures structural safety in temperatures as low as -50°C.

Offshore Platforms:

Critical components: Jacket legs, substructures, and decks for oil/gas platforms.

Withstands cyclic loads from waves, currents, and ice impacts.

Port Machinery:

Key structural parts for cranes, loaders, and heavy-duty hoists.

High fatigue resistance reduces maintenance downtime in high-stress operations.

Why FH36 Excels in Harsh Environments

Arctic-Grade Certification: Meets DNV GL Polar Code and IACS UR W11 for ice-class vessels.

Optimized Microstructure: Fine-grained ferrite-pearlite matrix ensures crack propagation resistance.

Cost Efficiency: Thinner sections vs. conventional steels lower material and welding costs.

For projects demanding extreme durability in cold climates, FH36 steel offers unmatched performance. Partner with certified mills to ensure compliance with EN 10225 and ASTM A131 specifications.

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Product advantages

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