Title:
AUXILIARY HOLE LANCE
Document Type and Number:
Japanese Patent JP2017133062
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an auxiliary hole lance capable of preventing the erosion of a lance.SOLUTION: There is provided an auxiliary hole lance comprising: the first cylindrical part being a hollow member at the innermost part and communicating the main hole at the tip part feeding oxygen into a treatment container with an auxiliary hole at the side face part; the second hollow part covering the outer surface of the first cylindrical part and forming the first space flowing a cooling medium with the outer surface of the first cylindrical part; the third cylindrical part as the outermost part forming the second space covering the outer surface of the second cylindrical part, communicated with the first space with the outer surface of the second cylindrical part, and through which a cooling medium flows; and a flow rate increasing mechanism provided at the second cylindrical part and accelerating the flow velocity of the cooling medium on the upper side of the auxiliary hole in the second space.SELECTED DRAWING: Figure 1
Inventors:
YAMADA YOSHIHIRO
KAIZAWA AKIHIDE
KAIZAWA AKIHIDE
Application Number:
JP2016013279A
Publication Date:
August 03, 2017
Filing Date:
January 27, 2016
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP
International Classes:
C21C5/46
Attorney, Agent or Firm:
Miaki Kametani
Tetsuo Kanamoto
Koji Hagiwara
Kazuki Matsumoto
Tetsuo Kanamoto
Koji Hagiwara
Kazuki Matsumoto