Understanding the Process of Continuous Casting of Steel Jun07

Understanding the Process of Continuous Casting of Steel...

Understanding the Process of Continuous Casting of Steel Continuous casting (CC) of steel is a process whereby liquid steel is solidified into a semi-finished steel product (billet, bloom, beam- blank, round or slab) for subsequent rolling in the rolling mills. The basic operation of a CC machine is to convert liquid steel of a given composition into a strand of desired shape and size through a group of operations like mould operation, spray cooling zone, straightener operation, etc. For successful continuous casting, it is necessary to understand the process behaviour under different conditions for these operations. The process of continuous casting basically comprised of the following sections. A tundish, located above the mould, to receive the liquid steel from steel teeming ladle and to feed it to the mould at a regulated rate. A primary cooling zone consisting of water cooled copper mould through which the liquid steel is fed from the tundish for generating a solidified outer steel shell sufficiently strong enough to maintain the strand shape as it passes into the secondary cooling zone. A secondary cooling zone in association with a containment section positioned below the mould, through which the steel strand (still mostly liquid) passes and is sprayed with water or a mix of water and air (air mist) for further solidifying of the steel strand. A section for the unbending and straightening of steel strand. This section is not there in the straight vertical casting machines. A cutting section consisting of cutting torches or mechanical shears for the cutting of the solidified steel strands into desired lengths for removal. A run out table to cooling beds or directly to a product transfer area. In the CC process, liquid steel flows from the steel teeming ladle, through a tundish into...