Temperature Fields and Thermal Stress in the Solidification of Cylindrical Continuous-Cast Steel Billet

被引：2

作者：

Krayushkin N.A. ^{[1
]}

Pribytkov I.A. ^{[1
]}

Shatokhin K.S. ^{[1
]}

机构：

[1] Moscow Institute of Steel and Alloys, Moscow

来源：

Steel in Translation | 2019年 / 49卷 / 01期

关键词：

casting rate; continuous casting; cooling rates; cylindrical billet; heat-transfer coefficient; nonuniform boundary conditions; secondary-cooling zone; temperature gradients; thermal stress;

D O I：

10.3103/S096709121901008X

中图分类号：

学科分类号：

摘要：

Abstract—The influence of nonuniform boundary conditions on the cooling rate of stainless steel in continuous casting of cylindrical billet is investigated. Nonuniformity of the boundary conditions over the billet perimeter is assumed. The longitudinal cooling rate is assumed constant within the cooled sector of the billet. The presence of heat fluxes between cooling sectors is assumed. The gradients of the temperature and the thermal stress that develop in the solidifying billet are compared at different cooling rates in the secondary-cooling zone. The thermal stress is compared with the permissible value for each grade of steel, so as to determine cooling conditions corresponding to permissible thermal stress. The results indicate that the cooling rate affects the appearance of external and internal defects in the continuous-cast cylindrical billet. It is also found that the nonuniformity of the boundary conditions affects the temperature fields in the solidifying continuous-cast cylindrical billet. The results are presented in graphical form and analyzed in detail. A mathematical model is developed to calculate the temperature fields in the solidifying billet, on the basis of the nonsteady heat-conduction equation. The thermal stress is calculated by familiar methods that permit the determination of the stress that appears between cooling zones in the solidifying billet. The results may be used to develop cooling conditions that correspond to permissible thermal stress. By that means, the frequency of internal and external defects in the solidifying continuous-cast cylindrical billet may be decreased. © 2019, Allerton Press, Inc.

引用

页码：20 / 23

页数：3

共 20 条

[1]

Evteev D.P., Kolybalov I.N., (Continuous Casting of Steel), pp. 131-135, (1984)

[2]

Kan Y.E., Process control of cast billets production, (Continuous Steel Casting), pp. 9-16, (1989)

[3]

A Study of the Continuous Casting of Steel, Brussels: Int. Iron Steel Inst, (1977)

[4]

Samoilovich Y.A., Timoshpol'Skii V.I., Trusova I.A., Filippov V.V., Steel Ingot, Vol. 2: Solidification and Cooling, (2000)

[5]

Malinochka Y.N., Moiseeva L.A., Esaulova T.V., Some defects in continuously cast slabs and metal quality improvement, Stal, 10, pp. 27-30, (1987)

[6]

Mishchenko I.O., Defect Control of the Surface and Macrostructure of Cast Slabs, Extended Abstract of Cand. Sci, (2006)

[7]

Krayushkin N.A., Kuznetsova N.P., Investigation of thermal conditions of round billets of high-quality steel solidification for semicontinuous casting, Izv. Vyssh. Uchebn. Zaved., Chern. Metall., 7, pp. 45-48, (2012)

[8]

Kuznetsova N.P., Nikitin D.A., Comparative analysis of the process of semicontinuous casting of steel in Russia and Europe, Proc. Conf. “66th Scientific Days in National University of Science and Technology Misis, pp. 287-294, (2011)

[9]

Emel'Yanov V.A., (Thermal Operation of Continuous Casting Machines: Manual), (1988)

[10]

Skvortsov A.A., Akimenko A.D., Ul'Yanov V.A., (Influence of External Influences on the Formation of Ingots), (1991)

← 1 2 →