Title:
STEEL AND STEEL WIRE, WHICH ARE FOR SPRING, AND MANUFACTURING METHODS THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/018028
Kind Code:
A2
Abstract:
Disclosed in the present specification are steel and a steel wire, which are for a spring, and manufacturing methods therefor, the steel and the steel wire having excellent resistance to permanent deformation by having increased in-material dislocation density or reduced average grain diameter. The steel wire for a spring, having excellent resistance to permanent deformation, according to one embodiment of the present invention, comprises, by wt%, 0.4-0.7% of C, 1.2-2.3% of Si, 0.2-0.8% of Mn, 0.2-0.8% of Cr, and the balance of Fe (iron) and other inevitable impurities, wherein the dislocation density thereof can be 1.16 x 1015 /m2 or more, and the average grain diameter thereof can be 8.4 μm or less.
Inventors:
KIM KWANHO (KR)
CHOI SEOKHWAN (KR)
CHOI MYUNGSOO (KR)
CHUN YOUNGSOO (KR)
CHOI SEOKHWAN (KR)
CHOI MYUNGSOO (KR)
CHUN YOUNGSOO (KR)
Application Number:
PCT/KR2022/010194
Publication Date:
February 16, 2023
Filing Date:
July 13, 2022
Export Citation:
Assignee:
POSCO CO LTD (KR)
International Classes:
C22C38/34; B21B1/16; C21D1/18; C21D9/52; C22C38/22; C22C38/24; C22C38/26; C22C38/28
Foreign References:
| JP2002180199A | 2002-06-26 |
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
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