The invention relates to a
smelting technology of III grade hot-rolled ribbed bars. The invention belongs to the technical field of steel
smelting. The technical scheme of the invention is that:
vanadium-containing molten iron is adopted as a
raw material; a
vanadium increasing process in a bar production procedure is divided into two steps that: first, during a steel producing procedure,
vanadium slag extracted from the vanadium-containing molten iron is added, and vanadium elements are reduced and added into
molten steel, such that first-step vanadium increasing is carried out; second, when steel is discharged from a converter, vanadium-containing molten iron is directly poured into the
ladle, such that second-step vanadium increasing is carried out. During the process, the vanadium elements in the vanadium-containing molten iron are directly converted into the vanadium elements in the vanadium-containing
molten steel. The vanadium alloyed raw materials (the vanadium
slag and the vanadium-containing molten iron) are internal materials sourced from a steel
refinery. With the composite vanadium increasing method, a problem of high cost in the production process of the III grade hot-rolled ribbed bars is solved. The produced ribbed bars satisfy both the
performance requirement and the
shock resistance requirement. With the method, direct and highly efficient utilization of rare resources is realized, the technology process is reduced, the production efficiency is improved, and the production cost is reduced.