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B-containing hot-rolled steel plate/strip with sulfuric acid dew point corrosion resistance and manufacturing method thereof

A technology for dew point corrosion and hot-rolled steel sheets, which is applied in the field of hot-rolled steel sheets/strips for dew point corrosion resistance of sulfuric acid containing B and its manufacturing field, which can solve the problems of affecting surface quality, uneven cooling, and deterioration of plate shape.

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

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

Method used

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  • B-containing hot-rolled steel plate/strip with sulfuric acid dew point corrosion resistance and manufacturing method thereof
  • B-containing hot-rolled steel plate/strip with sulfuric acid dew point corrosion resistance and manufacturing method thereof
  • B-containing hot-rolled steel plate/strip with sulfuric acid dew point corrosion resistance and manufacturing method thereof

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Embodiment Construction

[0082] 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.

[0083] 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 pl...

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Abstract

The invention discloses a B-containing hot-rolled steel plate / strip with sulfuric acid dew point corrosion resistance and a manufacturing method thereof. In the method, microalloy elements such as Cr,Ti, Sb and Cu and an element B are selectively added; in the smelting process, the alkalinity of slag, the type and melting point of inclusions in steel, the content of free oxygen in molten steel and the content of acid-soluble aluminum Als are controlled; double-roller thin-strip continuous casting is adopted for casting a cast strip, and the cast strip enters a lower closed chamber with a non-oxidizing atmosphere after being discharged out of crystallization rollers and enters an online rolling mill under the closed condition to be subjected to hot rolling; and a gas atomization cooling mode is adopted for cooling strip steel after rolling, and finally the strip steel is coiled. The steel strip produced by the method can be widely applied to the field of products with use environmentsrequiring sulfuric acid dew point corrosion resistance, such as tobacco baking equipment and air preheater heat exchange elements, conveying pipes, flue and chimney manufacturing structural parts andboiler preheater and economizer equipment in the industries of petroleum, chemical engineering, electric power, metallurgy and the like.

Description

technical field [0001] The invention belongs to the continuous casting process in the metallurgical industry, and in particular relates to a B-containing hot-rolled steel plate / strip for sulfuric acid dew point corrosion resistance and a manufacturing method thereof. 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 stri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/50C22C38/54C22C38/60C22C33/04C21D8/02B22D11/06
CPCC22C38/02C22C38/04C22C38/002C22C38/50C22C38/60C22C38/42C22C38/54C22C38/001C22C38/06C22C33/04C21D8/0226B22D11/0622C21D2211/005C21D2211/009
Inventor 方园吴建春
Owner BAOSHAN IRON & STEEL CO LTD
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