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Patent Searching and Data


Title:
STRUCTURAL STEEL HAVING EXCELLENT BRITTLE FRACTURE RESISTANCE AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2020/130515
Kind Code:
A3
Abstract:
A structural steel having excellent brittle fracture resistance according to an aspect of the present invention comprises, by weight%, 0.02-0.12% of C, 0.01-0.8% of Si, 1.5-2.5% of Mn, 0.005-0.5% of Al, 0.02% or less of P, 0.01% or less of S, 0.0015-0.015% of N, and the remainder of Fe and unavoidable impurities, wherein an outer surface layer portion and an inner central portion are microstructurally divided along the thickness direction, the surface layer portion comprises tempered bainite as a matrix structure, the central portion comprises bainitic ferrite as a matrix structure, and the NDT temperature by the NRL drop-weight test may be -70℃ or lower.

Inventors:
YI IL-CHEOL (KR)
CHO JAE-YOUNG (KR)
KANG SANG-DEOK (KR)
Application Number:
PCT/KR2019/017728
Publication Date:
August 27, 2020
Filing Date:
December 13, 2019
Export Citation:
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Assignee:
POSCO (KR)
International Classes:
B21B3/00; C22C38/04; C22C38/00; C22C38/02; C22C38/06; C22C38/08; C22C38/12; C22C38/14; C22C38/16; C22C38/18
Foreign References:
KR20150122779A2015-11-02
KR100833076B12008-05-27
KR101819356B12018-01-17
JPH064903B21994-01-19
KR960009174B11996-07-16
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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