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The crystallizer protection improvement and protection of the analyzer of slag thermal characteristics of the slag heat transfer characteristics

Author: ShenLe
Tutor: ShiZhe；ChouShengTao
School: Kunming University of Science and Technology
Course: Iron and steel metallurgy
Keywords: Mold powder Thermal characteristics analyzer Heat transfer performance Thermal Resistance
CLC: TF777
Type: Master's thesis
Year: 2009
Downloads: 39
Quote: 0
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Abstract


The protective slag film between the mold and shell directly affect lubrication and heat transfer of the slab. The rapid development of today's high-speed casting fluxes of heat transfer characteristics are of great significance on the stability of high-speed continuous casting operation and improve the quality of the slab. But so far have not developed is similar to the actual continuous casting process, can be used for simulation of mold and solidified shell protective slag heat transfer and determination of the protective slag heat transfer performance device. Improve and perfect the papers on the basis of previous studies the protective slag thermal characteristics analyzer, the analyzer on the heat transfer performance of carbon steel protective slag protection and low-carbon steel slag were determined. Also simulates the actual crystallization along the longitudinal direction of the different parts of the lateral heat transfer. Analyzer of the thermal characteristics than the previous design developed following improvements: (1), the heating system. (2), the temperature acquisition system. (3), the probe lifting device. Heating system to indirect heating by direct heating by silicon carbide heating power, slag components used to melt protective slag. Slag component material selection the 0Cr21Al6Nb iron-chromium alloy. Shape and size of the bottom surface circle diameter of 120 mm, a height of the cylindrical shape of 15 mm, and, in its upper open a diameter of 40mm, and deep 5mm groove; temperature acquisition system merged into the original data acquisition card and signal amplifier a temperature data acquisition module; probe lifting device improvement is to accurately predict the probe descent and easy to operate device. Thermal characteristics analyzer carbon steel protective slag and the protection of low-carbon steel slag were a number of repeated experiment, the results have a certain gap with the heat transfer characteristics of the actual continuous casting process mold powder, but generally speaking, Thermal characteristics analyzer is able to simulate the actual mold lateral heat transfer, it is reasonable in design. In addition, taking into account the lower end of the mold there is a considerable air gap, that there is a big interfacial thermal resistance, thermal conductivity as compared to the the copper much smaller stainless steel probe, determination of the heat transfer performance of the protective slag, used to simulate the crystallization the lower end of the heat transfer. Under our experimental conditions, carbon steel protection the slag ST-SP/666M3 the thermal resistance in the 8.120 ~ 8.676 × 10-4m2 · K / W range, low carbon steel protection the slag ST-SP/616AJ2 the thermal resistance at 3.484- 3.977 × 10-4m2 · K / W range. This paper also explores the cooling water, the thickness of the slag film and protective slag chemical composition fluxes heat flux, heat transfer coefficient and thermal resistance of the slag film.

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CLC: > Industrial Technology > Metallurgical Industry > Steelmaking > Ingot > Continuous cast steel,near net shape casting
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