Numerical Simulation And Application Of Corner In Straightening Of Slab Continuous Casting

In this paper,the morphology and damage of transverse cracks at the corners —transverse corner crack —in slab continuous casting process are briefly introduced.The formation mechanism and the influencing factors of transverse corner crack are summarized.The theory of prevention and treatment of transverse corner crack is summarized and compared.At present,the prevention and treatment of diagonal transverse corner crack can be divided into strong cold measures and weak cold measures,by changing the shape of the corner of the slab and thus affect the heat dissipation is weak cold measures.In order to comprehensively examine the temperature and mechanical condition of the different corners of the slab in the straightening process of the continuous casting process,in this paper,the temperature distribution and stress and strain of the slab with different chamfered angle and chamfered surface length in the straightening section are calculated by Finite Element Analysis.Through the simulation of the corner temperature of the straightening section,it is found that the length of the chamfered surface has a great influence on the temperature value.With the increase of the chamfered length,the corner temperature gradually increases.The angle of chamfered angle increases gradually,and the angle of the narrow corner gradually decreases,and the lowest point of the corner temperature gradually changes from the corner near wide surface to the corner near narrow surface.The chamfered slab is more evenly distributed than the rectangular slab in terms of temperature of at corners.The long the chamfered length is,thechamfered angle is more close to 45 ° and the corner temperature distribution is more uniform.The corner temperature of the chamfered slab is generally higher than that the temperature of the conventional slab above 50 ?,reaching about 900 ?,which avoids the brittle range of the steel and greatly improves the thermoplasticity of the slab.Based on the simulation of the stress and strain of the slab at the straightening section,it is found that the rectangular slab has a stress and strain concentration on the narrow surface near the corner,and the stress and strain is concentrated on the chamfered surface and inner slab near the wide angle;the size and range of stress and strain concentration points be affected by the change of corner shape.The thermoplastic of chamfered slab is improved by increasing the corner temperature,and the stress and strain can be changed at the corner of the slab by chamfered slab.Finally,the actual results of calculation and industrial experiments show that: the slab with chamfered angle of 22 ° ~ 38 ° and the chamfered length of40 ~ 80 mm have good plasticity,which is selected as the main chamfered corner design reference range;in the case of ensuring that the corner temperature of the slab is satisfied,a small angle and a long chamfered surface are preferred.