A method of evaluating the influence of continuous-casting parameters and the condition of the basic equipment on the quality of continuous-cast billet has been developed. It is found that the elements C, Mn, P, and S have the greatest influence on the susceptibility of the steel to surface and internal cracks. The quality of the slab microstructure in traditional continuous casting on a radial-curvilinear CCM depends on the rate of billet extrusion and the distance between the large- and small-radius rollers in the supporting system. The quality of the slab surface depends on the steel temperature in the intermediate ladle and the organization of heat extraction in the secondary cooling zone. The factors affecting internal-crack formation in the slabs are the mechanical stress on the ingot in the secondary-cooling zone and the formation of a primary crystalline structure; surface cracks are due to thermal stress.
展开▼
