40results about How to "Act as a reducing agent" patented technology

The invention discloses a reduction method based on a reduction pretreatment process and used for the iron oxide scale of hot-rolled strip steel. The reduction method comprises the following steps: rapidly heating the hot-rolled strip steel to 400-550 DEG C at a speed of 80-150 DEG C / s; carrying out isothermal reduction for 30-600s, wherein the reduction product is multigap sponge iron; after intermediate cooling, heating to 700-1100 DEG C at a speed of 80-150 DEG C / s; and carrying out isothermal reduction for 30-600s, wherein iron particles in the multigap sponge iron are mutually bound, thecrystal grains grow, the gaps, air holes and crystal boundaries in the reduction product are gradually reduced through material transfer, the total volume is reduced, a compact multi-crystal pure ironlayer with a microstructure is formed, and reduction for the iron oxide scale is completed. The reduction method is capable of remarkably increasing the reduction efficiency for the iron oxide scaleof the hot-rolled strip steel in a continuous annealing furnace, and capable of obtaining lots of reduced pure iron in a short reduction time, so that the influence of the residual of the iron oxide scale on the formability and adhesivity of the subsequent plated layer is avoided, and then the industrial promotion of a pickling-free reduction annealing hot-galvanizing prototype technology is ensured.