Method for producing thin-gauge riffled plate/strip through thin-strip continuous casting

Abstract

The invention discloses a method for producing a thin-gauge riffled plate / strip through thin-strip continuous casting. According to the method, the alkalinity of slag, the types and melting points ofinclusions in steel, the content of free oxygen in molten steel and the content of acid-soluble aluminum Als are controlled in a smelting process; then a cast strip with a thickness of 1.5-3 mm is cast through twin-roll thin-strip continuous casting, and cast 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 to hot rolling; a rolled steel strip is cooled in a gas atomization cooling manner; and finally a steel coil is obtained through coiling. The steel coil can be directly used as a hot-rolled riffled plate / strip, and can also be used as a finished riffled plate / strip after being subjected to edge trimming and leveling.

Description

technical field [0001] The invention belongs to the continuous casting process in the metallurgical industry, and in particular relates to a method for producing thin patterned steel plates / strips by continuous casting of thin strips. 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 strip with a thickness of less than 1...

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 strip and affecting product quality; third, uneven local cooling on the surface of the strip will cause deterioration of the shape of the strip , affecting the shape quality

[0009] However, due to the rapid solidification process characteristics of thin strip continuous casting, the produced steel generally has the problems of uneven structure, low elongation, high yield ratio, and poor formability; The grains have obvious inhomogeneity, which will lead to the inhomogeneous structure of the final product obtained after austenite transformation, resulting in unstable performance of the product

Therefore, it is difficult and challenging to use a thin strip continuous casting production line to produce high-strength thin-spec pattern plates. It is impossible to copy the traditional composition process, and breakthroughs in composition and process are required.

Images