EP 4332265 A1 20240306 - WIRE ROD AND STEEL WIRE FOR SPRING, SPRING WITH IMPROVED STRENGTH AND FATIGUE LIMIT, AND METHOD FOR MANUFACTURING SAME
Title (en)
WIRE ROD AND STEEL WIRE FOR SPRING, SPRING WITH IMPROVED STRENGTH AND FATIGUE LIMIT, AND METHOD FOR MANUFACTURING SAME
Title (de)
WALZDRAHT UND STAHLDRAHT FÜR FEDER, FEDER MIT VERBESSERTER FESTIGKEIT UND ERMÜDUNGSGRENZE UND VERFAHREN ZUR HERSTELLUNG DAVON
Title (fr)
FIL MACHINE ET FIL D'ACIER POUR RESSORT, RESSORT AYANT UNE RÉSISTANCE ET UNE LIMITE DE FATIGUE AMÉLIORÉES, ET PROCÉDÉ DE FABRICATION CORRESPONDANT
Publication
Application
Priority
- KR 20210071715 A 20210602
- KR 2022007483 W 20220526
Abstract (en)
Disclosed are a wire rod and a steel wire for a spring, a spring with improved strength and fatigue limit, and a method for manufacturing the same.The disclosed wire rod for a spring with improved strength and fatigue limit according to an embodiment includes, in percent by weight (wt%): 0.6 to 0.7% of C, 2.0 to 2.5% of Si, 0.2 to 0.7% of Mn, 0.9 to 1.5% of Cr, 0.015% or less of P, 0.01% or less of S, 0.01% or less of Al, 0.01% or less of N, 0.25% or less of Mo, 0.25% or less of W, 0.05% to 0.2% of V, 0.05% or less of Nb, and the balance of Fe and unavoidable impurities, wherein Mn+Cr≤1.8% and 0.05 at%≤Mo+W≤0.15 at% may be satisfied.
IPC 8 full level
C22C 38/34 (2006.01); B22D 11/00 (2006.01); C21D 1/18 (2006.01); C21D 8/02 (2006.01); C21D 9/54 (2006.01); C22C 38/00 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01)
CPC (source: EP KR)
B22D 11/001 (2013.01 - EP); B22D 11/005 (2013.01 - KR); C21D 1/18 (2013.01 - KR); C21D 1/25 (2013.01 - EP); C21D 1/32 (2013.01 - EP); C21D 1/48 (2013.01 - EP); C21D 6/002 (2013.01 - EP); C21D 6/008 (2013.01 - EP); C21D 7/13 (2013.01 - EP); C21D 8/0226 (2013.01 - KR); C21D 8/065 (2013.01 - EP); C21D 9/02 (2013.01 - EP); C21D 9/54 (2013.01 - KR); C21D 9/5732 (2013.01 - EP); C22C 38/00 (2013.01 - EP); C22C 38/001 (2013.01 - EP KR); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/18 (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); C22C 38/32 (2013.01 - EP); C22C 38/34 (2013.01 - EP KR); C21D 1/76 (2013.01 - EP); C21D 2211/004 (2013.01 - EP); C21D 2211/009 (2013.01 - EP 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 4332265 A1 20240306; CN 117751206 A 20240322; JP 2024521927 A 20240604; KR 20220163153 A 20221209; WO 2022255727 A1 20221208
DOCDB simple family (application)
EP 22816386 A 20220526; CN 202280049907 A 20220526; JP 2023574625 A 20220526; KR 20210071715 A 20210602; KR 2022007483 W 20220526