Thick slab corner crack control process

Abstract

The invention discloses a thick slab corner crack control process, which relates to the technical field of steel production, and comprises the following steps: comprehensively optimizing steel microalloy element components, selecting casting powder with proper alkalinity and viscosity, adjusting the cooling system of a crystallizer, optimizing secondary cooling strength, optimizing the vibration parameter and taper of the crystallizer, and improving the precision control of casting machine equipment, or measures such as a chamfering crystallizer and a surface structure control SSC technology are adopted, so that the occurrence of transverse cracks at the corners of a casting blank can be effectively controlled.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a crack control process at the corner of a thick slab. Background technique [0002] Transverse cracks at the corners of continuous casting slabs are usually hidden under the oxidized iron scale or skin of the slabs and cannot be directly observed. Cleaning the corners with a flame and grinding them with a mobile charging grinder can clearly show the transverse cracks. After the thick plate continuous casting slab with the defect of transverse crack is heated and rolled, bubble-shaped cracks will appear 20-50mm away from the edge of the upper and lower surfaces of the steel plate. Inhomogeneous temperature field, structural phase transition during solidification and poor equipment precision will cause additional stress and strain at the corners of the slab. At the same time, improper continuous casting process and casting operation make the solidification proce...

AI Technical Summary

Problems solved by technology

[0004] Production practice shows that the thicker and wider the slab, the easier it is to produce surface cracks and quality defects