Steel strip cooling method and cooling equipment - Nippon Steel & Sumitomo Metal Corporation

Title:

Steel strip cooling method and cooling equipment

Document Type and Number:

Japanese Patent JP6350663

Kind Code:

B2

Abstract:

[Object] To provide a method for cooling a steel strip in a galvannealing furnace. The method performs mist cooling on a steel strip in a cooling zone of a galvannealing furnace and can achieve both productivity and quality. [Solution] The cooling method includes: by an adjusted cooling installation provided at an upstream side in a sheet-passing direction of the cooling installation, jetting mist to the steel strip passing through the cooling installation in a manner that an amount of mist jetted to the steel strip passing through the cooling installation is smaller in an edge portion in a width direction of the steel strip than in a center portion; by a mist suction installation provided at least at a downstream side in the sheet-passing direction of the cooling installation, sucking at least part of mist jetted to the steel strip; and cooling the steel strip at a sheet-passing speed such that, during a period between start and end of cooling of the steel strip, a temperature of the steel strip is within a film boiling temperature range and a temperature of the edge portion in the width direction of the steel strip is equal to or higher than a temperature of the center portion in at least a range of 2/3 or more from the upstream side in the sheet-passing direction of a total cooling length of the cooling installation.

Inventors:

Koichi Nishizawa
Hiroshi Minehara
Yasuhiro Mori
Seiji Sugiyama
Tadashi Matsumoto

Application Number:

JP2016535808A

Publication Date:

July 04, 2018

Filing Date:

February 23, 2015

Export Citation:

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