Title:
REFRACTORY FOR GAS BLOWING NOZZLE AND GAS BLOWING NOZZLE
Document Type and Number:
WIPO Patent Application WO/2020/059801
Kind Code:
A1
Abstract:
The present invention improves the durability of a refractory for a gas blowing nozzle in which at least one thin metal tube is buried. This refractory for a gas blowing nozzle has a central refractory in which a thin metal tube is buried and an outer peripheral refractory which surrounds the outer periphery of the central refractory, wherein in a plane of the refractory for a gas blowing nozzle, when the radius of an imaginary circle having a minimum radius including all the buried thin metal tubes is R mm, the outer shape of the central refractory is concentric with the imaginary circle and is a circle having a radius of R+10 mm to R+150 mm, the central refractory is an MgO-C refractory in which a carbon content is 40-80 mass%, a metal Al content is 3-8 mass%, and a metal Si content is 0.30-1.0 times more than the metal Al content by mass ratio, and the outer peripheral refractory is an MgO-C refractory in which a carbon content is 10-25 mass%.
Inventors:
HOSOHARA SEIJI (JP)
IIDA ATSUHISA (JP)
TORIGOE ATSUSHI (JP)
FUJIYOSHI RYOMA (JP)
IIDA ATSUHISA (JP)
TORIGOE ATSUSHI (JP)
FUJIYOSHI RYOMA (JP)
Application Number:
PCT/JP2019/036776
Publication Date:
March 26, 2020
Filing Date:
September 19, 2019
Export Citation:
Assignee:
JFE STEEL CORP (JP)
SHINAGAWA REFRACTORIES CO (JP)
SHINAGAWA REFRACTORIES CO (JP)
International Classes:
C21C7/072; C04B35/043; C21C5/48; F27D3/16
Foreign References:
| JP2012229487A | 2012-11-22 | |||
| JP2016188411A | 2016-11-04 | |||
| JPS6143248U | 1986-03-20 | |||
| JP2019077934A | 2019-05-23 | |||
| JPS5931810A | 1984-02-21 | |||
| JPS6324008A | 1988-02-01 | |||
| JP2000212634A | 2000-08-02 | |||
| JP2003231912A | 2003-08-19 | |||
| JPS5815072A | 1983-01-28 | |||
| JP3201678B2 | 2001-08-27 |
Other References:
See also references of EP 3822372A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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