Title:
MULTI-STAGE POROUS PLUG
Document Type and Number:
WIPO Patent Application WO/2018/052180
Kind Code:
A1
Abstract:
The present invention relates to a multi-stage porous plug, which overcomes limitations of product length and upper and lower part property deviation of the product since porous parts coming into contact with molten steel so as to inject gas therethrough are formed into multiple stages, enables the remaining porous part to be easily checked during hot rolling since the porous parts of each stage have different sizes and cross-sectional shapes, has effects of reducing workload and saving costs according to an increase in usage lifespan, has excellent operation stability by enabling the estimation of expected lifespan and safe remainder confirmation to be easily identified, and comprises: a upper porous part having a plurality of pores; a lower porous part having a plurality of pores and provided at the lower part of the upper porous part; a porous indicator part having a plurality of pores, provided at the lower part of the lower porous part, and having a cross section shape different from that of the lower porous part; and a sleeve part for encompassing the upper porous part, the lower porous part, and the indicator part.
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Inventors:
JANG MOON-JIN (KR)
CHA HYUN-MIN (KR)
CHA HYUN-MIN (KR)
Application Number:
PCT/KR2017/006203
Publication Date:
March 22, 2018
Filing Date:
June 14, 2017
Export Citation:
Assignee:
KOREA REFRACTORIES CO LTD (KR)
International Classes:
C21C7/072; C21C7/00
Foreign References:
| JP2010242191A | 2010-10-28 | |||
| JP2009046756A | 2009-03-05 | |||
| JPH1171609A | 1999-03-16 | |||
| KR20140123074A | 2014-10-21 | |||
| KR20100127329A | 2010-12-06 |
Other References:
See also references of EP 3517634A4
Attorney, Agent or Firm:
KIM, Min-Kyu (KR)
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