A method for thin strip continuous casting to produce hot-rolled steel sheets/strips resistant to sulfuric acid dew point corrosion
A technology for dew point corrosion and hot-rolled steel plates, which is applied in the field of thin strip continuous casting to produce hot-rolled steel plates/strips resistant to sulfuric acid dew point corrosion. Uneven steel performance and other problems, to achieve the effect of homogenizing the internal microstructure, improving the resistance to sulfuric acid dew point corrosion, and reducing the thickness of oxide scale
Active Publication Date: 2022-06-24
BAOSHAN IRON & STEEL CO LTD
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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
[0013] The above-mentioned patents are all related to the corrosion resistance of steel, but none of the content involves the effect of sulfuric acid dew point corrosion resistance. The present invention is a steel type specially proposed for sulfuric acid dew point corrosion resistance
Method used
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[0072] The present invention will be further described below with examples, but these examples do not limit the present invention by any means. Any changes made by those skilled in the art in the implementation of the present invention under the inspiration of this specification will fall within the protection scope of the claims of the present invention.
[0073] see figure 1 , the molten steel that conforms to the chemical composition design of the present invention is directly poured into a crystallization by two relatively rotating and rapid cooling through the large ladle long nozzle 2, the tundish 3, the submerged nozzle 4 and the distributor 5. In the molten pool 7 surrounded by the rolls 8a, 8b and the side sealing plate devices 6a, 6b, the molten steel solidifies on the circumferential surface of the rotation of the crystallization rolls 8a, 8b, and then forms a solidification shell and gradually grows. Then, the gap between the two crystallization rolls is the smalle...
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Abstract
A method for thin strip continuous casting to produce hot-rolled steel sheets / strips resistant to sulfuric acid dew point corrosion. The invention selectively adds microalloying elements such as Cr, Ti, Sb, and Cu, and controls the alkalinity of slag and the Types of inclusions and melting points, free oxygen content in molten steel, and acid-soluble aluminum Als content; then twin-roll thin strip continuous casting is performed to cast 1.5-3mm thick strip steel, and after the strip steel exits the crystallization roll, it directly enters a In a lower airtight chamber with a non-oxidizing atmosphere, it enters into an online rolling mill for hot rolling under airtight conditions; the strip steel after rolling is cooled by gas atomization cooling, and finally the strip steel is coiled.
Description
technical field [0001] The invention belongs to a continuous casting process in the metallurgical industry, in particular to a method for producing hot-rolled steel sheets / strips for sulfuric acid dew point corrosion resistance by thin strip continuous casting. Background technique [0002] Most of the traditional thin strips are produced by continuous rolling of slabs 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 slab with a thickness of about 200mm through continuous casting, reheat and keep the slab, and then perform rough rolling and finishing rolling to obtain a steel strip with a thickness generally greater than 2mm. Laminar cooling and coiling complete the entire hot rolling production process. If it is necessary to produce a steel strip with a thickness of less than 1.5mm (inclusive), it is relatively di...
Claims
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IPC IPC(8): C22C38/60C22C38/58C22C38/50C22C38/42C22C38/06C22C38/04C22C38/02C22C33/04B22D11/06C21D1/74C21D8/02C21D11/00
CPCC22C38/60C22C38/58C22C38/50C22C38/42C22C38/06C22C38/04C22C38/02C22C38/002C22C38/001C22C33/04B22D11/0622B22D11/0682C21D1/74C21D8/0205C21D8/0226C21D11/005C21D2211/005C21D2211/009
Inventor 吴建春方园杨璐任三兵
Owner BAOSHAN IRON & STEEL CO LTD