COOLING METHOD AND COOLING DEVICE FOR STRIP STEEL - NIPPON STEEL & SUMITOMO METAL CORP

Title:

COOLING METHOD AND COOLING DEVICE FOR STRIP STEEL

Document Type and Number:

WIPO Patent Application WO/2016/013240

Kind Code:

A1

Abstract:

[Problem] To provide a cooling method for strip steel in an alloying furnace that can establish both productivity and quality while mist cooling the strip steel in a cooling zone in an alloying furnace. [Solution] Mist is sprayed on strip steel passing through cooling equipment such that the amount of mist sprayed at the edge parts in the direction of width of the strip steel is less than the amount of mist sprayed at the center part for the amount of mist spray sprayed on the strip steel passing through the cooling equipment by means of adjusted cooling equipment provided on the upstream side in the direction of strip passage through the cooling equipment. At least part of the mist sprayed on the strip steel is sucked up by mist suction equipment provided in the cooling equipment at least on the downstream side in the direction of strip passage. The strip steel is cooled at a strip passage speed such that, between the start of cooling and the end of cooling for the strip steel, the temperature of the strip steel is in a film boiling temperature range, and the edge part temperature is a temperature equal to or greater than the center part temperature in the direction of width of the strip steel in a range at least 2/3 or greater from the upstream end in the direction of strip passage of the total cooling length of the cooling equipment.

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Inventors:

NISHIZAWA KOICHI (JP)
MINEHARA HIROSHI (JP)
MORI YASUHIRO (JP)
SUGIYAMA SEIJI (JP)
MATSUMOTO MASAFUMI (JP)

Application Number:

PCT/JP2015/055012

Publication Date:

January 28, 2016

Filing Date:

February 23, 2015

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

C23C2/28; C23C2/06; C23C2/40

Foreign References:

JP2000297357A	2000-10-24
JP2013245376A	2013-12-09
JPH05279831A	1993-10-26

Other References: