In direct rolling, the high-temperature steel billets produced in the roughing mill directly enter the finished rolling mill and are rolled into finished products.
Its main advantages are: utilizing the waste heat of the steel billet to save energy; reducing metal oxidation and improving the yield rate.
In direct rolling, the steel billet does not have surface inspection (see billet inspection) and cleaning (see billet surface cleaning) processes in the cold state, and must be flamed (see billet flame cleaning) or manual cleaning in the hot state.
Eliminate surface defects of the billet, or use defect-free steel ingots to minimize surface defects of the billet.
The qualified high-temperature steel billet after shearing is directly fed into the finished rolling mill. In order to ensure the final rolling temperature of the finished rolling mill, the billet temperature and the opening rolling temperature of the preliminary rolling mill should be increased as much as possible.
The rough rolled slab is fed into the hot strip rolling mill to directly produce strip steel, which has been used in production. Some large-section steel sections can also be produced by direct rolling.
How to further expand the range of specifications and varieties of direct rolling and balance the production of the roughing mill and the finished rolling mill are topics for future research.
Due to the large temperature drop, small-section steel billets require online supplementary heating before entering the finished rolling mill for direct rolling to ensure the final rolling temperature of the rolled pieces.
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