Title:
STEEL FOR HOT FORMING, HOT-FORMED MEMBER, AND MANUFACTURING METHODS THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/125878
Kind Code:
A1
Abstract:
An embodiment of the present invention provides steel for hot forming, a hot-formed member, and methods for manufacturing same, the steel comprising, by wt%, 0.06-0.1% of C, 0.05-0.6% of Si, 0.6-2% of Mn, 0.05% or less of P, 0.02% or less of S, 0.01-0.1% of Al, 0.01-0.8% of Cr, 0.01-0.5% of Mo, 0.02% or less of N, and the remainder of Fe and inevitable impurities, wherein an alloy factor represented by relational expression 1 below is 7 or more, and the number of carbides having a circular equivalent diameter of 0.5 µm or greater is 10 5/mm 2 or less. [Relational expression 1] Alloy factor = I(Mn)×I(Si)×I(Cr)×I(Mo) (wherein, in relational expression 1, the I values for the components are I(Mn) = 3.34×Mn+1, I(Si) = 0.7×Si+1, I(Cr) = 2.16×Cr+1, and I(Mo) = 3×Mo+1, respectively, and the content of each component is expressed as wt%)
Inventors:
KIM SEONG-WOO (KR)
OH JIN-KEUN (KR)
KIM SANG-HEON (KR)
CHUN HYO-SIK (KR)
BAE SEONG-BEOM (KR)
OH JIN-KEUN (KR)
KIM SANG-HEON (KR)
CHUN HYO-SIK (KR)
BAE SEONG-BEOM (KR)
Application Number:
PCT/KR2020/018658
Publication Date:
June 24, 2021
Filing Date:
December 18, 2020
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/38; B21B1/24; C21D8/02; C22C38/22; C22C38/48; C22C38/50; C22C38/54
Domestic Patent References:
| WO2019186927A1 | 2019-10-03 |
Foreign References:
| JP6380659B2 | 2018-08-29 | |||
| KR101899688B1 | 2018-09-17 | |||
| KR20100137196A | 2010-12-30 | |||
| JPH11100635A | 1999-04-13 | |||
| US6296805B1 | 2001-10-02 |
Other References:
See also references of EP 4079913A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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