Method for producing hot-rolled steel plate/strip with sulfuric acid dew point corrosion resistance through thin-strip continuous casting

Abstract

The invention relates to a method for producing a hot-rolled steel plate/strip with sulfuric acid dew point corrosion resistance through thin-strip continuous casting. According to the method, microalloy elements such as Cr, Ti, Sb and Cu are selectively added, and the alkalinity of slag, the types and melting points of inclusions in steel, the content of free oxygen in molten steel and the content of acid-soluble aluminum Als are controlled in the smelting process; then strip steel with a thickness of 1.5-3 mm is cast through twin-roll thin-strip continuous casting, and the strip steel directly enters a lower closed chamber with a non-oxidizing atmosphere after being discharged out of a crystallization roller and enters an online rolling mill under the closed condition to be subjected tohot rolling; the rolled strip steel is cooled in a gas atomization cooling manner; and finally the strip steel is coiled.

Description

technical field [0001] The invention belongs to the continuous casting process in the metallurgical industry, and in particular relates to a thin strip continuous casting method for producing hot-rolled steel plates / strips resistant to sulfuric acid dew point corrosion. Background technique [0002] Most of the traditional thin strip steel is produced by multi-pass continuous rolling of the slab with a thickness of 70-200mm. The traditional hot rolling process is: continuous casting + slab reheating and heat preservation + rough rolling + finishing rolling + cooling + Coiling, that is, firstly obtain a cast slab with a thickness of about 200mm through continuous casting, reheat the cast slab and keep it warm, then perform rough rolling and finish rolling to obtain a steel strip with a thickness generally greater than 2mm, and finally process the steel strip Laminar cooling and coiling complete the whole hot rolling production process. If it is necessary to produce a steel s...

AI Technical Summary

Problems solved by technology

At the same time, the contact of high-temperature strip steel with cooling water will cause many problems: first, water spots (rust spots) will be formed on the surface of the strip steel, which will affect the surface quality; second, the cooling water used for laminar flow cooling or spray cooling It is easy to cause uneven local cooling on the surface of the strip, resulting in uneven microstructure inside the strip, resulting in uneven properties of the

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