EP 4063531 A4 20231206 - WIRE ROD FOR ULTRA-HIGH STRENGTH SPRING, STEEL WIRE AND MANUFACTURING METHOD THEREOF
Title (en)
WIRE ROD FOR ULTRA-HIGH STRENGTH SPRING, STEEL WIRE AND MANUFACTURING METHOD THEREOF
Title (de)
WALZDRAHT FÜR HOCHFESTE FEDER, STAHLDRAHT UND VERFAHREN ZUR HERSTELLUNG DAVON
Title (fr)
FIL MACHINE POUR RESSORT À ULTRA-HAUTE RÉSISTANCE, FIL D'ACIER ET PROCÉDÉ DE FABRICATION ASSOCIÉ
Publication
Application
Priority
- KR 20190172003 A 20191220
- KR 2020008091 W 20200622
Abstract (en)
[origin: EP4063531A1] Disclosed are a wire rod for an ultra-high strength spring, a steel wire, and a manufacturing method thereof, and more particularly, a wire rod for an ultra-high strength spring having excellent processibility, a steel wire, and a manufacturing method thereof.According to an embodiment, the disclosed wire rod for an ultra-high strength spring includes, in percent by weight (wt%), 0.55 to 0.65% of C, 0.5 to 0.9% of Si, 0.3 to 0.8% of Mn, 0.3 to 0.6% of Cr, 0.015% or less of P, 0.01% or less of S, 0.01% or less of Al, 0.005% or less of N, more than 0% and 0.04% or less of Nb, and the remainder being Fe and unavoidable impurities, and satisfies a value of Formula (1) below being 0.77 or more and 0.83 or less: C+1/6*Mn+1/5*Cr+1/24*Si wherein in Formula (1), C, Mn, Cr, and Si represent the content (wt%) of each element.
IPC 8 full level
C22C 38/26 (2006.01); C21D 1/18 (2006.01); C21D 1/22 (2006.01); C21D 1/25 (2006.01); C21D 1/42 (2006.01); C21D 1/60 (2006.01); C21D 6/00 (2006.01); C21D 8/06 (2006.01); C21D 9/02 (2006.01); C21D 9/52 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01)
CPC (source: EP KR)
B21B 1/16 (2013.01 - KR); B21B 3/00 (2013.01 - KR); C21D 1/18 (2013.01 - EP); C21D 1/22 (2013.01 - EP); C21D 1/25 (2013.01 - EP); C21D 1/42 (2013.01 - EP); C21D 1/60 (2013.01 - EP); C21D 6/002 (2013.01 - EP); C21D 6/005 (2013.01 - EP); C21D 6/008 (2013.01 - EP); C21D 8/065 (2013.01 - EP KR); C21D 9/02 (2013.01 - EP); C21D 9/525 (2013.01 - EP); C22C 38/001 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/06 (2013.01 - EP); C22C 38/26 (2013.01 - EP KR); C21D 2211/002 (2013.01 - EP KR); C21D 2211/008 (2013.01 - EP KR)
Citation (search report)
- [I] CN 108179355 A 20180619 - SINOSTEEL ZHENGZHOU RES INSTITUTE OF STEEL WIRE & STEEL PRODUCTS CO LTD
- [A] KR 20040035136 A 20040429 - POSCO
- [A] KR 20030053771 A 20030702 - POSCO [KR]
- [A] US 6264759 B1 20010724 - BAE CHUL MIN [KR], et al
- [A] US 2017362679 A1 20171221 - MESPLONT CHRISTOPHE [FR], et al
- [A] CN 107299291 A 20171027 - WUHAN IRON & STEEL CO LTD
- [A] WO 2015052035 A1 20150416 - BEKAERT SA NV [BE]
- See also references of WO 2021125471A1
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
DOCDB simple family (publication)
EP 4063531 A1 20220928; EP 4063531 A4 20231206; CN 114929923 A 20220819; CN 114929923 B 20231020; JP 2023508314 A 20230302; JP 2024060017 A 20240501; KR 102326263 B1 20211115; KR 20210079830 A 20210630; WO 2021125471 A1 20210624
DOCDB simple family (application)
EP 20903249 A 20200622; CN 202080093502 A 20200622; JP 2022538152 A 20200622; JP 2024035371 A 20240307; KR 20190172003 A 20191220; KR 2020008091 W 20200622