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Application requirements of 304L stainless steel in shipbuilding

Add Time:2021-05-04 Hits:3

According to the shipowner's requirements, 304L duplex stainless steel is used as raw materials in the cargo hold of the ship, about 250t. All 240 parts are cut by foreign machinery and transported to Shanghai by sea.

The raw material was first used in chemical ships and entered China Classification Society. Because there is a big difference between the manufacturing process and the traditional steel structure, after nearly half a year's skill preparation and nearly 100 times of welding experiments, it is realized that the hull inner shell created with this kind of data should completely change the shipyard's previous practice, in order to ensure the weld quality, reduce the repair times and avoid excessive welding deformation, Without a piece of remaining steel plate, it is necessary to achieve one-time success, and the assembly and welding rate reaches 100%. Therefore, in the process of hull building, a number of construction plans were compiled, and the best construction method of 304L stainless steel was confirmed after certification.

Before the commencement of the project, the shipyard has made nearly 100 welding process appraisals, covering different parts, different methods and different welding methods, and accumulated certain experience. Then, it successfully tutored and compiled the welding process of 304L stainless steel, the construction method of 304L stainless steel, the welding method of 304L stainless steel and 304L stainless steel, the welding method of 304L stainless steel and 304L stainless steel Welding method of 304L stainless steel and 316L, welding method of 304L stainless steel to class B ship plate, etc.

The ideal condition of 304L stainless steel is 50% ferrite + 50% austenite. However, after processing, the composition of 304L stainless steel has changed greatly after welding. The content of ferrite in 304L stainless steel is of great value to the mechanical function and corrosion resistance after welding. Too high ferrite reduces the resistance and pitting corrosion resistance of materials, However, too low ferrite will lead to low strength and risk of stress corrosion cracking, so it is generally controlled within 30% - 60%.

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