Experimental und numerical investigations on cooling efficiency of Air-Mist nozzles on steel during continuous casting

International Symposium on Liquid Metal Processing & Casting 2015

材料科学;金属工艺学

Arth, G.^1 ; Taferner, M.^1 ; Bernhard, C.^1 ; Michelic, S.^2

Department of Ferrous Metallurgy, Montanuniversität Leoben, Franz-Josef-Straße 18, Leoben

8700, Austria^1

INTECO Special Melting Technologies GmbH, Wienerstrasse 25, Bruck an der Mur

8600, Austria^2

关键词: Continuous casting of steels;    Cooling efficiency;    Heat transfer coefficient (HTC);    Numerical investigations;    Numerical predictions;    Surface temperature distribution;    Surface temperatures;    Water distributions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/143/1/012033/pdf
DOI  :  10.1088/1757-899X/143/1/012033

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Cooling strategies in continuous casting of steel can vary from rapid cooling to slow cooling, mainly controlled by adjusting the amount of water sprayed onto the surface of the product. Inadequate adjustment however can lead to local surface undercooling or reheating, leading to surface and inner defects. This paper focuses on cooling efficiency of Air-Mist nozzles on casted steel and the experimental and numerical prediction of surface temperature distributions over the product width. The first part explains the determination of heat transfer coefficients (HTC) on laboratory scale, using a so called nozzle measuring stand (NMS). Based on measured water distributions and determined HTC's for air-mist nozzles using the NMS, surface temperatures are calculated by a transient 2D-model on a simple steel plate, explained in the second part of this paper. Simulations are carried out varying water impact density and spray water distribution, consequently influencing the local HTC distribution over the plate width. Furthermore, these results will be interpreted with regard to their consequence for surface and internal quality of the cast product. The results reveal the difficulty of correct adjustment of the amount of sprayed water, concurrent influencing water distribution and thus changing HTC distribution and surface temperature.