Production method of wide and heavy steel plate with excellent ultra-low-temperature toughness used for offshore wind power
A technology for offshore wind power and a manufacturing method, which is applied in the field of manufacturing wide and thick steel plates for offshore wind power with excellent ultra-low temperature toughness, can solve problems such as difficulty in adapting to the harsh marine environment, and achieve the effects of strict Pcm control, low carbon equivalent and excellent impact performance.
Inactive Publication Date: 2013-01-30
QINHUANGDAO SHOUQIN METAL MATERIAL +1
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Problems solved by technology
Offshore wind power steel is in its infancy in my country. Domestic onshore wind power mainly adopts the national standard Q345E-Z steel, which is difficult to adapt to the harsh environment of the ocean.
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[0014] According to the chemical composition range of S355G8+N of the present invention, it is smelted on a 100-ton converter, and continuously cast into a continuous casting slab of 400mm×2000mm×L, and rolled on a Shouqin wide and thick plate production line with 60, 90, and 130mm steel plates. The chemical composition is shown in Table 1, the rolling and heat treatment process is shown in Table 2, and the mechanical properties are shown in Table 3.
[0015] Table 1 Chemical composition of S355G8+N offshore wind power steel (weight, %)
[0016]
[0017] Table 2 Rolling process system
[0018]
[0019] Table 3 Test results of mechanical properties
[0020]
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Abstract
The invention discloses a production method of a wide and heavy steel plate with excellent ultra-low-temperature toughness used for offshore wind power, belonging to the technical field of rolling of the wide and heavy steel plate used for offshore wind power through a continuous coasting blank. The production process comprises the steps of: molten iron, converter smelting, LF (Ladle Furnace) refining, RH (Ruhstahl Hausen) vacuum degassing, continuous casting, steel blank check, heating, phosphorous removal, rough rolling, fine rolling, ACC (Activated Calcium Carbonate) water cooling, straightening, cooling in pile, shearing, shot blasting, normalizing, checking and storage. According to the European EN110225 standard, on the basis of the continuous casting blank, through adding micro-alloying elements, such as Nb, V, Ti and the like, and reasonably controlling rolling, a cooling process and a normalizing heat treatment method, the production yield strength is 355-410 MPa, the strength of extension is 470-550 MPa, the coefficient of elongation is 26-36%, the average value of the percentage of contraction of a section in a direction Z is 35-81%, the impact absorbing energy of a core part of the steel plate at ultra-low temperature of -60 DEG C is 100-240 J, and meanwhile, the wide and heavy steel plate has steel with good using performance as well as the thickness is 40-130 mm, and the specification is S355G8+N.
Description
technical field [0001] The invention belongs to the technical field of continuous casting slab production of wide and thick steel plates for offshore wind power, and in particular provides a method for manufacturing wide and thick steel plates for offshore wind power with excellent ultra-low temperature toughness, mainly involving the production of low-carbon micro-alloyed continuous casting slabs with a thickness of 40-130mm Specification European standard EN10225 Standard normalizing S355G8+N Offshore wind power steel manufacturing method, the core of the steel plate has excellent ultra-low temperature impact toughness at -60°C. Background technique [0002] Wind energy is an inexhaustible renewable emerging energy. Energy is becoming increasingly tense, and wind power generation is the first renewable alternative energy source at home and abroad. Wind power is one of the most potential sustainable development projects. The country and the government have raised the wind ...
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IPC IPC(8): C22C38/16C21D8/02
Inventor 郑会平王根矶白学军何元春黄少帅王东柱万潇李春智杨永达王彦峰隋鹤龙
Owner QINHUANGDAO SHOUQIN METAL MATERIAL
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