Title:
開孔ビットおよびそれを用いた出銑口の開孔方法
Document Type and Number:
Japanese Patent JP6881694
Kind Code:
B2
Abstract:
Proposed is a hole-opening bit that can simplify an operation for opening a tap hole for installing a burner lance for raising the temperature of a furnace bottom of a blast furnace, which allows the blast furnace to be started up in a relatively short time after long-time blast stoppage or after a furnace cooling accident, by efficiently heating the furnace bottom, and a tap hole opening method using the hole-opening bit. A hole-opening bit 1 used to open the tap hole in the furnace bottom of the blast furnace including chips 2 on rear surfaces 1b, 1c of a furnace drilling surface 1a of the hole-opening bit such that outermost ends of the chips are located inside of an outermost end of the hole-opening bit.
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Inventors:
Youhei Kitamura
Tomohiko Kawakami
Kohei Horinouchi
Tomohiko Kawakami
Kohei Horinouchi
Application Number:
JP2020560430A
Publication Date:
June 02, 2021
Filing Date:
March 10, 2020
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C21B7/12
Domestic Patent References:
| JP2012062546A | ||||
| JP5014140U | ||||
| JP3070257U |
Attorney, Agent or Firm:
Ginza Marronnier Patent Office