Marine steel finds diverse applications in shipbuilding, with distinctions in steel types based on their use. These types mainly encompass hull structure steel, boiler steel, pressure vessel steel, and mechanical structure steel.

Hull Structure Steel:
Hull structure steel, produced by approved mills, bears the classification society's mark upon passing inspection. It is produced using various methods, including open hearth furnaces, electric furnaces, and converters. Testing includes chemical analysis and physical tests like tensile, cold bending, and impact tests. Hull structure steel falls into two categories:

a. General Strength Hull Structure Steel: Also known as marine carbon steel, it's divided into grades A, B, D, and E. Each grade has specific properties and uses.

b. High-Strength Hull Structure Steel: Incorporating alloying elements like manganese, niobium, and vanadium, it offers improved strength, mechanical properties, weldability, and corrosion resistance compared to general strength steel.

Boiler Steel:
Boiler steel is used for pressure components in steam boilers. These components face high pressure and heat exposure, necessitating strict control of chemical composition. Steam drum steel demands thermal strength, toughness, and structural stability, while boiler tube steel requires high-temperature strength, plasticity, and corrosion resistance.

Pressure Vessel Steel:
Pressure vessel steel includes carbon grades, low-alloy high-strength grades, and low-temperature steel. It meets diverse design requirements for pressure vessels used in industries like petroleum and chemicals.

Mechanical Structure Steel:
Steel for mechanical structures undergoes heat treatment and is suitable for machine and part manufacturing. It encompasses quenched and tempered structural steel, surface-hardened steel, cold-formed steel, spring steel, and bearing steel.

Applications of Marine Steel:

Steel Plate: Constituting 60%-65% of the hull structure, steel plates include hull, deck, and partition plates. Thicknesses below 4mm are thin plates, while those above 4mm are thick plates.

Section Steel: Accounting for about 35%-40% of the structure, section steel forms the hull's skeleton. It comes in various cross-sectional shapes like flat, angle, round, I-beam, T-shaped, and channel steel.

Cast and Forged Steel: Cast steel is used for fore and stern columns, while forged steel is employed for items like rudder stocks and shafts due to its superior strength and toughness.

In conclusion, marine steel encompasses various types, each tailored to specific applications within shipbuilding. Hull structure, boiler, pressure vessel, and mechanical structure steel all play vital roles in constructing seaworthy vessels, ensuring safety and durability at sea.


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