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

A technology for dew point corrosion and hot-rolled steel sheets, which is used in the field of thin strip continuous casting to produce hot-rolled steel sheets/strips for sulfuric acid dew point corrosion resistance.

Active Publication Date: 2021-03-19
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment Construction

[0072] The present invention will be further illustrated below with examples, but these examples are by no means any limitation to the present invention. 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 conforming to the design of the chemical composition of the present invention is poured directly through the ladle 1, through the ladle long nozzle 2, the tundish 3, the submerged nozzle 4 and the flow distributor 5 in a crystallization chamber that is made of two relatively rotating and capable of rapid cooling. In the molten pool 7 surrounded by the rollers 8a, 8b and the side sealing plate devices 6a, 6b, the molten steel solidifies on the circumferential surface where the crystallization rollers 8a, 8b rotate, and then forms a solidified shell and gradually grows at the p...

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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...

Claims

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Application Information

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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
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