A short-process method for producing atmospheric corrosion-resistant thin strip steel

Abstract

The invention relates to a method for producing an atmospheric corrosion resistance thin strip steel through a short process. The method comprises: 1) adopting a thin strip continuous casting process to produce to form a casting strip with a thickness of 1-2.5 mm, wherein the chemical components comprise, by mass, 0.02-0.15% of C, 0.20-0.75% of Si, 0.2-1.5% of Mn, 0.02-1.5% of P, less than or equal to 0.008% of S, 0.3-0.80% of Cu, 0.30-1.25% of Cr, 0.08-0.65% of Ni, 0.01-0.06% of Al, and the balance of Fe and unavoidable impurities; 2) adding into a rolling machine to roll into a steel strip with a thickness of 0.7-1.5 mm; 3) cooling with a cooling device, wherein the cooling device is a spray cooling and descaling particle spraying combined device, and the cooling rate is 5-20 DEG C / s; and 4) after cutting the head, adding to a coiling machine to coil, wherein the coiling temperature is 650-800 DEG C. According to the invention, the acid-free phosphorus removing method is adopted to remove metal oxides and other impurities on the strip material surface, such that the surface performance of the thin strip continuous casting strip can be maintained to the maximal degree, the application of the thin strip continuous casting product to replace the cold rolling product (replacing the cold rolling product with the hot rolling product) can be achieved, and the performance price ratio of the product can be increased.

Description

technical field [0001] The invention relates to a continuous casting process, in particular to a short-flow method for producing atmospheric corrosion-resistant thin strip steel. Background technique [0002] Traditional thin strips are mostly produced by multi-pass continuous rolling of cast slabs with a thickness of 70-200mm, while cast strips produced by twin-roll thin strip continuous casting process are rolled into hot strips in one or two passes. Rolled strips can be put into the market after pickling or cold rolling. Compared with the traditional strip production process, the latter has a shorter production line and requires less energy. It is a low-carbon and environmentally friendly hot-rolled thin strip production process. [0003] The typical technological process of twin-roll thin strip continuous casting is: the molten steel in the ladle is poured directly through the nozzle, tundish and flow distributor in a casting roller surrounded by two relatively rotating...

AI Technical Summary

Problems solved by technology

If this kind of strip steel goes through the traditional wet chemical-pickling descaling method, it will damage the surface layer of the strip steel, and make the corrosion-resistant element layer enriched on the surface of the strip steel, such as Cu, P, Cr, etc. disappear or reduced, thereby reducing corrosion resistance

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