API spec 2W is an American Standard Petroleum Association specification for thermo-mechanical controlled rolling of TMCP steel plates for marine structures. For welded structural parts of marine structures, NV F40 hull steel structural plate, API spec 2W steel plates in key parts must be resistant to impact, plastic fatigue loads and laminar tearing. The thickness of API2W-50 grade can reach about 150mm, and the thickness of API2W-60 grade can reach about 100mm.
Steel pipe NV F40 hull steel structural plate manufacturing, environmental protection equipment and other manufacturers supply steel products, which have been well received by new and old customers. Steel sales have maintained a strong growth momentum and have achieved a good reputation in the steel industry. The NV F40 hull steel structural plate company has a young, energetic and service spirit, high-quality management team.
The production process of hot-rolled steel plate and cold-rolled steel plate is different. Hot rolled steel plate is rolled at high temperature, and cold rolled steel plate is rolled at normal temperature. Generally speaking, cold rolled steel plate has better strength and hot rolled steel plate has better ductility. The thickness of NV F40 hull steel structural plate cold rolling is generally smaller, and that of hot rolling can be larger. The surface quality, appearance and dimension accuracy of cold rolled steel plate are better than that of hot rolled steel plate.
The effect of nitrogen (N) on the properties of NV F40 hull steel structural plate and so on steel is similar to that of carbon and phosphorus. With the increase of nitrogen content, the strength of steel can be significantly improved, especially the plasticity, especially toughness, and the weldability will be decreased, and the cold brittleness will be intensified. At the same time, aging tendency, cold brittleness and hot brittleness will be increased, which will damage the weldability and cold bending property of steel. Therefore, the nitrogen content in NV F40 hull steel structural plate and so on steel should be reduced and limited as much as possible. Generally, nitrogen content should not be higher than 0.018%.
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