Method for producing 700MPa ferrito-martensite dual-phase steel by medium plate blank continuous casting
A slab continuous casting and martensite technology, applied in the direction of manufacturing converters, etc., can solve the problems of difficult and accurate control of molten steel temperature drop, difficulty in casting billet segregation, and inability to accurately control the temperature of the middle cladding, and achieve production process control. stable effect
Active Publication Date: 2016-08-17
TANGSHAN IRON & STEEL GROUP
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Problems solved by technology
It is recognized in the field that the main difficulty in making 700MPa ferritic and martensitic dual-phase steel lies in the problem of controlling slab segregation, while the control of slab segregation in medium slab continuous casting machines mainly adopts low superheat and light pressure Next, the three measures of electromagnetic stirring. For example, it is difficult to control the segregation of 700MPa high-quality dual-phase steel billet under the condition of low superheat and light pressure without electromagnetic stirring. The control of low superheat mainly depends on the heat storage temperature of the ladle. If the nominal capacity of the converter is small, it is difficult to accurately control the temperature drop of the molten steel in the entire steelmaking process, resulting in a relatively high control of the superheat of the molten steel during the casting process, which cannot effectively and accurately control the temperature of the tundish. [S] and [P] in water also have a certain influence on slab segregation, how to minimize [S] and [P] in molten steel is also a difficult point in steelmaking
Method used
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Effect test
Embodiment 1
[0075] Example 1 Steel type GFL780HX, casting speed 1.4m / min, production section: 1015×200mm, degree of superheat 30°C, segregation at the center of the low magnification sample after erosion figure 1 , belonging to the C1.0 level.
Embodiment 2
[0076] Example 2 steel type GFL780HX casting speed 1.2m / min, production section: 1285×200mm, degree of superheat 26°C, macro segregation at the center of the low magnification sample after erosion is as follows figure 2 , belonging to B0.5 level.
Embodiment 3
[0077] Example 3 steel type GFL780HX casting speed 1.2m / min, production section: 1220×200mm, degree of superheat 23°C, macro segregation at the center of the low magnification sample after erosion is as follows image 3 , belonging to the C1.0 level.
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The invention discloses a method for producing 700MPa ferrito-martensite dual-phase steel by medium plate blank continuous casting. The method comprises the following steps: molten iron desulfurization, dephosphorization converter smelting, decarbonization converter smelting, LF (ladle furnace) treatment, RH degassing treatment and medium plate blank continuous casting. When the medium plate blank continuous casting technique matched with the dual converters is utilized to produce the 700MPa ferrito-martensite dual-phase steel, the technological parameters of various steps are controlled to produce the satisfactory continuous casting blank, the continuous casting blank is subjected to hot rolling to produce the high-quality hot-rolled coiled plate, and the high-quality hot-rolled coiled plate is subjected to cold rolling to finally produce the high-quality continuous annealing product.
Description
technical field [0001] The invention relates to a method for producing 700MPa ferritic-martensitic dual-phase steel by continuous casting of medium slabs, belonging to the technical field of iron and steel smelting. Background technique [0002] In recent years, with the rapid development of China's automobile industry, energy conservation and environmental protection have become an inevitable trend in the development of modern automobiles. One of the important measures is to reduce the weight of automobiles. Research and development have been carried out one after another, and ferritic-martensitic dual-phase steel is just one of them. In this dual-phase steel, the content of martensite in its solid solution structure reaches 35-50%, and the rest is ferrite. At present, the composition of 700MPa ferritic-martensitic dual-phase steel can be controlled at [N] 0.0040%, [S] 0.005%, [P] 0.018% T[O] 0.0030%, and the slab segregation reaches below B0.5 level level. The production...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C22C33/06C21C5/28C21C7/10C22C38/04C22C38/02B22D11/00
CPCB22D11/001C21C5/28C21C7/10C21D2211/005C21D2211/008C22C33/06C22C38/02C22C38/04
Inventor 李经哲吕浩张洪波李梦英马德刚周泉林段云祥吴艳青冯慧霄李波王建兴王健范志业李鹏周航
Owner TANGSHAN IRON & STEEL GROUP