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Method for reducing wrinkles of double-roll cast-rolled thin strip

A technology of casting strip and casting and rolling is applied in the field of improving the surface wrinkle of hot-rolled thin strip steel, which can solve the problems of speed mismatch, uneven assembly, and adverse effects of coil shape, so as to achieve easy operation, improve wrinkle, and improve product qualification rate Effect

Active Publication Date: 2021-02-02
SHAGANG GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, if the speed of the upper and lower rollers of the pinch roller does not match, the assembly is not level and other problems will have a negative impact on the roll shape

Method used

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  • Method for reducing wrinkles of double-roll cast-rolled thin strip
  • Method for reducing wrinkles of double-roll cast-rolled thin strip
  • Method for reducing wrinkles of double-roll cast-rolled thin strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The molten steel with qualified smelting composition flows into the molten pool formed by the twin rolls and side seals through the tundish and the transition ladle. 1.65mm, convexity 25μm casting belt, control the speed of the casting machine to 75m / min, pass through the hot box containing nitrogen, control the amount of nitrogen at 1000m3 / h, so that the temperature of the casting belt is 1350℃, adjust the pressure of 1# pinch roller to 16KN, The tension of the pinch roll is 2.1MPa. After one pass of hot rolling mill, it is rolled into a strip with a thickness of 0.85mm. It is cooled to the process temperature by air mist, and then coiled after entering the coiler with a coiler. Set the withdrawal time of the coiler as 5s to form a 0.85mm hot-rolled thin strip coil.

[0054] Under the control of the process parameters, the probability of product wrinkling is 1.5%.

Embodiment 2

[0056] The molten steel with qualified smelting composition flows into the melting pool formed by the twin rolls and side seals through the tundish and transition ladle. 1.7mm, convexity 30μm casting belt, control the speed of the casting machine to 70m / min, pass through the hot box containing nitrogen, control the amount of nitrogen at 1500m3 / h, so that the temperature of the casting belt is 1300℃, adjust the pressure of 1# pinch roller to 18KN, The tension of the pinch roll is 2.2MPa. After one pass of hot rolling mill, it is rolled into a strip with a thickness of 0.9mm, cooled to the process temperature by air mist, and then coiled after entering the coiler with a coiler. Set the withdrawal time of the coiler as 8s to form a 0.9mm hot-rolled thin strip coil.

[0057] Under the control of the process parameters, the probability of product wrinkling is 1.3%.

Embodiment 3

[0059] The molten steel with qualified smelting composition flows into the molten pool formed by the twin rolls and side seals through the tundish and transition ladle. 0.9mm, convexity 35μm casting belt, control the speed of the casting machine to 60m / min, pass through the hot box containing nitrogen, control the amount of nitrogen at 3000m3 / h, so that the temperature of the casting belt is 1250℃, adjust the pressure of the 1# pinch roller to 18KN, The tension of the pinch roll is 2.5MPa. After one pass of hot rolling mill, it is rolled into a strip with a thickness of 0.9mm. It is cooled to the process temperature by air mist, and then coiled after entering the coiler with a coiler. Set the withdrawal time of the coiler as 10s to form a 0.9mm hot-rolled thin strip coil.

[0060] Under the control of the process parameters, the probability of product wrinkling is 1.0%.

[0061] Table 2 is a summary of the specific technical effects on the wrinkle judgment rate under the tech...

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Abstract

The invention provides a method for reducing the problem of wrinkles generated to hot-rolled thin strip steel produced through double-roll cast rolling. By adjusting the convexity, the thickness and the temperature of a cast strip, the pressure of a pinch roll, the tension of the pinch roll, the evacuation time of a wrapper and the like, the wrinkle condition of the hot-rolled thin strip steel produced through the double-roll cast rolling process is reduced. The method mainly comprises the steps of adjusting the convexity of the cast strip to range from 15 micrometers to 35 micrometers, adjusting the thickness of the cast strip to range from 1.65 mm to 1.8 mm and adjusting the temperature of cast strip steel to range from 1250 DEG C to 1350 DEG C so as to reduce deformation of the centralarea of the strip steel. The method further comprises the steps that when a thin strip steel product is produced through double-roll cast rolling, the pressure range of the pinch roll is adjusted to be 16-20 kN, the tension of the pinch roll is adjusted to range from 2.0 Mpa to 2.5 MPa, and / or the evacuation time of the coiler wrapper is adjusted to range from 5 s to10 s. Through one or more of the above measures, the problem of wrinkles of the hot-rolled thin strip steel produced through double-roll cast rolling can be effectively reduced, the wrinkle judgment rate is obviously reduced, and the product percent of pass and the profit level can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production, and relates to a method for producing hot-rolled thin strip steel based on twin-roller thin-strip casting and rolling, in particular to a method for improving surface wrinkles of hot-rolled thin strip steel during the twin-roller casting-rolling production process. Background technique [0002] Hot-rolled steel strip generally refers to coiled steel strip with a thickness of 1-20 mm, which is widely used in automobile, electrical machinery, chemical industry, shipbuilding and other industrial sectors, and is also used as raw material for cold-rolled, welded pipe, and cold-formed steel production. In the application process, in addition to the usual mechanical properties, the requirements for surface quality and plate shape are getting higher and higher, especially for thin strip products below 2.0mm. The traditional process of producing hot-rolled strips usually adopts the cente...

Claims

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Application Information

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IPC IPC(8): B22D11/06B22D11/16B22D11/20
CPCB22D11/0622B22D11/0651B22D11/16B22D11/20
Inventor 张淑娟李婷婷李霞刘新院李化龙吴荣洲顾小祥袁良民周东升施一新
Owner SHAGANG GROUP