EP 4368739 A2 20240515 - STEEL AND STEEL WIRE, WHICH ARE FOR SPRING, AND MANUFACTURING METHODS THEREFOR
Title (en)
STEEL AND STEEL WIRE, WHICH ARE FOR SPRING, AND MANUFACTURING METHODS THEREFOR
Title (de)
STAHL UND STAHLDRAHT FÜR FEDERN UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
ACIER ET FIL D'ACIER DESTINÉS À UN RESSORT, ET LEURS PROCÉDÉS DE FABRICATION
Publication
Application
Priority
- KR 20210106248 A 20210811
- KR 2022010194 W 20220713
Abstract (en)
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 an 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 × 10<sup>15</sup>/m<sup>2</sup> or more, and the average grain diameter thereof can be 8.4 µm or less.
IPC 8 full level
C22C 38/34 (2006.01); B21B 1/16 (2006.01); C21D 1/18 (2006.01); C21D 9/52 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01)
CPC (source: EP KR)
B21B 1/16 (2013.01 - KR); C21D 1/18 (2013.01 - KR); C21D 1/25 (2013.01 - EP); C21D 6/002 (2013.01 - EP); C21D 6/008 (2013.01 - EP); C21D 8/065 (2013.01 - EP); C21D 9/02 (2013.01 - EP); C21D 9/525 (2013.01 - EP KR); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/22 (2013.01 - EP KR); C22C 38/24 (2013.01 - EP KR); C22C 38/26 (2013.01 - EP KR); C22C 38/28 (2013.01 - EP KR); C22C 38/34 (2013.01 - EP KR); C21D 2211/001 (2013.01 - KR)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
EP 4368739 A2 20240515; CN 117795117 A 20240329; JP 2024532753 A 20240910; KR 20230024115 A 20230220; WO 2023018028 A2 20230216; WO 2023018028 A3 20230413
DOCDB simple family (application)
EP 22856029 A 20220713; CN 202280054709 A 20220713; JP 2024508098 A 20220713; KR 20210106248 A 20210811; KR 2022010194 W 20220713