Experimental device and experimental method for simulating low-speed 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: 2018-04-06
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 particularly relates to an experimental device and method for simulating low-speed solidification of extra-thickplates. The experimental device is characterized by comprising a crystallizer, thermocouples assembled on the crystallizer, a collector connected with the thermocouples, and a water spraying device arranged in a secondary cooling area, wherein the water spraying device comprises nozzles arranged linearly, a water distributor connected with the nozzles, and a flow controller connected with the water distributor. Low-speed solidification of molten steel in the crystallizer is realized through a static mold casting method; after an initial solidified shell with a certain thickness is formed by the molten steel, the nozzles are used for conducting slight water spraying on the shell surface exposed in the air at low temperature by means of the detachability; and the process of low-speed solidification of extra-thick plates produced through continuous casting is simulated by reducing the solidification speed by stages, so that the microstructure evolution rule of low-speed solidification ofextra-thick plates in the continuous casting process is researched, and inclusion distribution situations and reasons for various defects are analyzed.
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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