Title:
STEEL MATERIAL FOR SEISMIC DAMPER HAVING SUPERIOR IMPACT TOUGHNESS, AND MANUFACTURING METHOD FOR SAME
Document Type and Number:
WIPO Patent Application WO/2022/124682
Kind Code:
A1
Abstract:
The present invention provides a steel material for a seismic damper, and a manufacturing method for same. The steel material comprises, in wt%, at most 0.006% of C, at most 0.05% of Si, at most 0.3% of Mn, at most 0.02% of P, at most 0.01% of S, 0.005 to 0.05% of Al, at most 0.005% of N, 48/14Х[N] to 0.05% of Ti (here, [N] is the nitrogen content in wt%), 0.04 to 0.15% of Nb, and the remainder in Fe and other unavoidable impurities, and has a ferrite single structure, and has a ferrite grain average particle size of 150 to 500 ㎛ in a region of a surface layer part, corresponding to 30% of the total thickness from the surface thereof.
Inventors:
CHO JAE-YOUNG (KR)
KANG SANG-DEOK (KR)
KANG SANG-DEOK (KR)
Application Number:
PCT/KR2021/017978
Publication Date:
June 16, 2022
Filing Date:
December 01, 2021
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/00; C21D7/06; C21D8/02; C22C38/02; C22C38/04; C22C38/06; C22C38/14
Domestic Patent References:
| WO2008088605A2 | 2008-07-24 |
Foreign References:
| JP2000026936A | 2000-01-25 | |||
| JPH11172367A | 1999-06-29 | |||
| KR20100004806A | 2010-01-13 | |||
| JP2002241897A | 2002-08-28 | |||
| JP2007284748A | 2007-11-01 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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