Method for heating steel sheet, method for producing coated steel sheet, direct fired furnace, and continuous hot-dip galvanizing facility
AssigneeJfe Steel Corporation
InventorsYu TERASAKI, Kenichi OSUKA, Gentaro TAKEDA
Life of this patent
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Abstract
A galvanized steel sheet is disclosed. A method for heating a steel sheet includes heating a front surface side and a rear surface side of a steel sheet that is passing through a direct fired furnace that has an oxidation zone where operation is conducted at an air ratio of 1 or more and a reduction zone where operation is conducted at an air ratio of less than 1, in which the heating is carried out with flames injected from at least one slit burner extending in the width direction of the steel sheet while the steel sheet passes through at least the reduction zone.
Claims10
A method for heating a steel sheet, the method comprising heating a front surface side and a rear surface side of a steel sheet that is passing through a direct fired furnace that has an oxidation zone where operation is conducted at an air ratio of 1 or more and a reduction zone where operation is conducted at an air ratio of less than 1, wherein the heating is carried out with flames injected from at least one slit burner extending in a width direction of the steel sheet while the steel sheet passes through at least the reduction zone.
A direct fired furnace including:
- an oxidation zone where operation is conducted at an air ratio of 1 or more, a reduction zone where operation is conducted at an air ratio of less than 1, and a control device capable of controlling the air ratios in the oxidation zone and the reduction zone,
- wherein at least one portion of the reduction zone is equipped with:
- at least one slit burner disposed on a front surface side of the steel sheet and at least one slit burner disposed on a rear surface side of the steel sheet, each of the slit burners extending in a width direction of the steel sheet and injecting flames toward the steel sheet passing through the oxidation zone and the reduction zone.
Dependencies are inferred from the claim text.