Steel plate manufacturing facility and manufacturing method

Inactive Publication Date: 2012-01-26
JFE STEEL CORP
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  • Abstract
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  • Claims
  • Application Information

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Benefits of technology

[0020]According to exemplary embodiments of the invention, since the scale thickness of the steel plate is thinned and made uniform before the cooling step, the steel plate can be uniformly cooled with little surface temperature deviation among positions in the width direction of the steel plate in the cooling step. Thus, the steel plate excellent in steel plate shape and mechanical property can be manufactured.
[0021]In the steel plate manufacturing method, preferably, when T [K] denotes the temperature of the steel plate before cooling, the period of time t [s] between the

Problems solved by technology

In actually manufacturing a steel plate using the methods disclosed in Patent Literature 1 and Patent Literature 2 mentioned above, in some cases, scale is not completely removed during descaling, but descaling causes scale nonuniformity, resulting in poor surface condition.
The pressures at the point of impact of cooling water are low and the disclosed methods

Method used

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  • Steel plate manufacturing facility and manufacturing method
  • Steel plate manufacturing facility and manufacturing method
  • Steel plate manufacturing facility and manufacturing method

Examples

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examples

[0082]The steel plate 1, rolled by the hot rolling mill 3, having a thickness of 30 mm and a width of 3500 mm was passed through the first hot leveler 5 and the descaler 4 and was then controlled such that the steel plate was cooled from 820° C. to 420° C. As regards a condition for stable cooling calculated from the above-described expressions (6), (7), and (8), the period of time t between the completion of removal of scale on the steel plate 1 by the descaler 4 and the start of cooling of the steel plate 1 by the cooling equipment 6 is less than or equal to 42 s, preferably, less than or equal to 19 s, and more preferably, less than or equal to 5 s.

[0083]As regards the descaler 4, the spraying pressure of nozzles was 17.7 MPa, the spray flow rate per nozzle was 64 L / min / nozzle, the spraying distance (the distance between each spraying nozzle of the descaler 4 and each surface of the steel plate 1) was 130 mm, the spray angle of nozzle was 32°, the angle between the spray directio...

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Abstract

A facility is provided for manufacturing a steel plate excellent in steel plate shape and mechanical property while setting low cooling-water spraying performance in a descaling step and achieving uniform cooling in a cooling step. Specifically, a hot rolling mill 3, a first hot leveler 5, a descaler 4, and cooling equipment 6 are arranged in that order from the upstream side in a conveying direction. A pressure P [MPa] at the point of impact of cooling water sprayed from the descaler to each surface of a steel plate 1 is greater than or equal to 1.5 MPa.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is the U.S. National Phase application of PCT International Application No. PCT / JP2010 / 055497, filed Mar. 23, 2010, and claims priority to Japanese Patent Application No. 2009-073994, filed Mar. 25, 2009, and Japanese Patent Application No. 2010-006722, filed Jan. 15, 2010, the disclosures of which PCT and priority applications are incorporated herein by reference in their entirely for all purposes.FIELD OF THE INVENTION[0002]The present invention relates to a steel plate manufacturing facility and manufacturing method of hot rolling, hot leveling, and cooling a steel plate.BACKGROUND OF THE INVENTION[0003]The application of cooling control as a process of manufacturing a steel plate has recently been widening. Since a typical hot rolled steel plate is not necessarily uniform in, for example, shape and surface condition, however, strip temperature deviation tends to occur in the steel plate during cooling. The occurrence ...

Claims

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Application Information

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IPC IPC(8): B21B45/04B21B45/02
CPCB21B39/08B21B45/08B21B45/0218B21B39/00B21B45/02
Inventor KUROKI, TAKASHINAKATA, NAOKIHIRATA, KENJIFURUMAI, TAKAYUKIFUJII, YUKIOTERASAKI, MOTOJI
Owner JFE STEEL CORP
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