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Due to the harsh working environment of the ship, the hull hull is subject to chemical corrosion, electrochemical corrosion and corrosion of Marine organisms and microorganisms. The hull is subjected to large wind and wave impact and alternating load. The shape of the ship makes its processing method complicated and other factors, so the steel used in the hull structure is strictly required. First of all, good toughness is the most critical requirement, in addition, it requires high strength, good corrosion resistance, welding performance, processing and forming performance and surface quality. In order to ensure quality and ensure sufficient toughness, the Mn/C of the chemical composition is required to be above 2.5, and the carbon equivalent is also strictly required, and it is produced by steel mills recognized by the shipping inspection department.
NM400 wear-resistant carbon steel plate is widely used in mining machinery, coal mining machinery, environmental protection machinery, engineering machinery, etc. It is also commonly used as high-strength structural steel with yield strength ≥ 800MPa.
SA516Gr. 70 is widely used in petroleum, chemical industry, power station, boiler and other industries to make reactors, heat exchangers, separators, spherical tanks, gas tanks, liquefied gas tanks, nuclear reactor pressure shells, boiler drums, liquefied petroleum gas cylinders, high-pressure water pipes of hydropower stations, water turbine shells and other equipment and components.
The 4130 carbon steel plate is usually used in the quenched and tempered state. When the carbon content is at the lower limit, the steel can also be used as the carburized steel with higher central strength.
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