What is steel used in marine engineering structures?

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What is steel used in marine engineering structures?
Steel plates used for ship hull structures are referred to as ship plates. Due to the harsh working environment of the ship, the outer shell of the ship is subject to chemical corrosion, electrochemical corrosion and corrosion of marine microorganisms from seawater; the hull is subject to large wind and wave impacts and alternating loads; the shape of the ship makes its processing methods complicated, etc., so the hull is Structural steel requirements are strict.

First of all, good toughness is the most critical requirement. In addition, high strength, good corrosion resistance, welding performance, processing and forming performance and surface quality are required. In order to ensure quality and sufficient toughness, the Mn/C of the chemical composition is required to be above 2.5, there are also strict requirements for carbon equivalent, and it must be produced by a steel factory approved by the ship inspection department. Structural steel for hulls is divided into two types: general thickness steel and high-strength steel. General-strength steel is divided into four grades A, B, C and D according to quality; high-strength steel is divided into two strength levels and three quality grades; AH32, DH32 , EH32, AH36, DH36, EH36. It is widely used in the manufacturing of ship hull structures, docks, oil production platforms, marine pipelines, coastal power plants, docks and other facility structural parts in ocean, coastal and inland navigation areas.