Thin-belt continuous casting method and apparatus

Abstract

The invention discloses a thin strip continuous casting method, that is, molten steel enters the molten pool formed by crystallization rolls, and is cooled and lightly rolled by the crystallization rolls to form a cast strip. In the width direction of the strip, the gas is sprayed on both sides of the cast strip for forced cooling, so that the cast strip is cooled to the temperature required by the process, and then it is hot-rolled and controlled to cool until it is coiled. The device of the present invention includes two blowing, connecting rod transmission and synchronous mechanisms that are respectively arranged on both sides of the casting belt; the blowing mechanism includes bearing seats, support shafts, nozzles, etc.; The rod is connected with the support shaft; the synchronous mechanism includes a moving trolley, a rack, a gear, a trolley driving device, etc. The angle between the nozzle and the casting belt is adjusted by the rotation of the support shaft; the distance between the nozzle and the casting belt is adjusted by the synchronous movement of the moving trolley. The invention can effectively improve the surface and internal quality of the cast strip, increase the productivity and expand the production of steel types.

Description

technical field [0001] The invention relates to thin strip continuous casting process and equipment technology, in particular to continuous casting thin strip cooling control and device. Background technique [0002] Thin strip continuous casting is a new process of directly casting molten steel into 1-5mm thin strips. At present, the basic technological process of thin strip continuous casting is: crystallization roll thin strip continuous casting machine (double roll, single roll, wheel belt type) - airtight chamber - looper - pinch - hot rolling (single rack or two racks or no )-controlled cooling-coiling. [0003] At present, the main problems of this process are: [0004] 1. It is difficult to control the end point of solidification. In the traditional continuous casting process, the continuous casting slab is completely solidified after passing through the crystallizer, secondary cooling, and air cooling zone. The length of the liquid core is 23000-30000mm. The infl...

AI Technical Summary

Problems solved by technology

This brings difficulties to the industrialization of thin strip continuous casting

[0005] 2. Unstable quality

(2) During the production process, the process parameters such as casting speed and casting temperature may change according to the production situation

If the solidification end point is below the contact point of the twin rolls during thin strip continuous casting, breakout, shrinkage and shrinkage will occur in the cast strip; on the contrary, if the solidification end point is above the contact point of the twin rolls, the rolling force will be rapid Increased, the cast strip is rolled in the high-temperature molten two-phase zone, and the steel is basically in the high-temperature brittle zone, where longitudinal cracks easily occur. If the rolling force overloads the crystallization roll, it will stop, resulting in production stoppage and even molten steel Spills in the crystallization rollers, causing safety accidents

[0006] 3. Relatively low productivity

The control idea is to control the quality of the cast strip by controlling the temperature of the crystallization roll, that is, controlling the primary cooling; through the air cooling control of the direction of the crystallization roll body, the uniformity of the surface temperature of the crystallization roll is solved, and finally the purpose of controlling the quality of the cast strip is achieved. ; Moreover, the whole set of equipment is arranged in the direction of the roll body to control a series of gas mixing chambers, gas pipes and nozzles. The overall equipment is relatively complicated, especially in the position of the upper airtight chamber, which brings difficulties to operation and sealing; especially when the crystallization roll In the event of a steel spill, the system will be damaged

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