Experimental device and experimental method for simulating slow solidification of extra-thick plates
An experimental device and technology for extra-thick plates, applied in the field of steelmaking and continuous casting, can solve problems such as lack of experimental means
Active Publication Date: 2019-12-31
UNIV OF SCI & TECH LIAONING
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Problems solved by technology
[0004] At present, there are few reports on the internal defect control technology of extra-thick slabs, and there is an urgent need for research and development of extra-thick slab continuous casting technologies such as light reduction technology, electromagnetic stirring technology at the end of solidification, and anti-bulging technology for roll arrangement. Development, there are few reports on the evolution of the solidification structure of extra-thick plates, the segregation and distribution of elements, the behavior of precipitates during solidification, and the mechanism of "cold" meniscus.
In particular, there is a lack of certain experimental means in the research of slow solidification thermal state experiments on extra-thick plates.
Method used
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Embodiment 1
[0051] Embodiment 1: Carry out the experiment of slow solidification in magnesia crystallizer
[0052] Step 1: Determination of crystallizer material
[0053] According to the temperature requirements of the mold material, select materials with a maximum allowable temperature greater than or equal to 1400°C; magnesia, clay, silicon and chromium refractory materials all meet the requirements; select magnesia refractory materials, and the maximum allowable temperature of the material is 1600°C- 1700℃, thermal conductivity λ is 2.1W / (m.℃), density ρ is 2450kg / m 3 , the specific heat capacity Cp is 1250J / (kg.℃), and α=6.857×10 from α=λ / (ρ·Cp) -7 ; α∈(2.676×10-7, 21.41×10-7), so magnesia refractories can be used as materials for slow solidification crystallizers;
[0054] Step 2: Determination of crystallizer size
[0055] According to the size of the crystallizer that can produce 420mm×2020mm extra-thick slab, according to the requirement that the geometric similarity ratio is ...
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Abstract
The invention belongs to the technical field of steelmaking and continuous casting, and in particular relates to an experimental device and method for simulating the slow solidification of extra-thick plates. The experimental device is characterized in that it includes a crystallizer, a thermocouple assembled on the crystallizer, and The collector connected with the thermocouple, the water spray device arranged in the secondary cooling area, the water spray device includes nozzles arranged in a linear manner, the water separator connected with the nozzle, and the flow control device connected with the water separator device. The invention utilizes a static die-casting method to realize the slow solidification of molten steel in the crystallizer. After the molten steel forms a primary shell with a certain thickness, it utilizes its detachability to remove the surface of the shell that is exposed to the air at a relatively low temperature. Use nozzles to spray water weakly, and slow down the solidification rate in stages to simulate the slow solidification process of continuous casting to produce extra-thick slabs, study the microstructure evolution law of slow solidification of extra-thick slabs during continuous casting, and analyze the distribution of inclusions and the causes of various defects.
Description
technical field [0001] The invention belongs to the technical field of steelmaking and continuous casting, and in particular relates to an experimental device and an experimental method for simulating slow solidification of extra-thick plates. Background technique [0002] With the rapid development of steel for nuclear power engineering, ship plate steel for military industry, high-strength steel with low welding crack sensitivity, and steel for special pressure vessels, the demand for thick slabs is increasing. At present, the production technology of extra-thick continuous casting slabs larger than 400mm has been paid more and more attention worldwide, and many enterprises have started the production of extra-thick continuous casting slabs through technological transformation or new casting machines. [0003] During the continuous casting of extra-thick slabs, due to the thicker section, lower casting speed, and weak cooling in the secondary cooling zone, the solidificati...
Claims
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IPC IPC(8): B22D11/124B22D11/22
CPCB22D11/124B22D11/225
Inventor 李静杨宝张连望许长军解雷孙春晓许多
Owner UNIV OF SCI & TECH LIAONING
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