Patent ID: 7682418

Claim:
A cored wire injection process for introducing fluxes and alloying additives in a liquid steel bath after adjusting a bath temperature and a chemistry of liquid steel in a secondary treatment unit, a ladle of said treatment unit having a bath depth, said injection process comprising the steps of: determining dimensions of a prefabricated cored wire containing the fluxes and alloying additives based upon a grade of the liquid steel in the liquid steel bath, the bath temperature, a size of the ladle, the bath depth of the ladle, and properties of a cored wire material, wherein the dimensions of the prefabricated cored wire are determined for maximum utilization of said additives; determining a speed of injection of the prefabricated cored wire into the ladle based upon the grade of the liquid steel in the liquid steel bath, the bath temperature, the size of the ladle, the bath depth of the ladle, and the properties of the cored wire material; providing a prefabricated cored wire containing the fluxes and alloying additives and having the determined dimensions; injecting the prefabricated cored wire into the ladle at the determined speed of injection; and releasing said additives from the prefabricated cored wire very close to a bottom of the ladle at a depth approximately equal to the bath depth.