EP 3088551 A1 20161102 - ROLLED STEEL MATERIAL FOR HIGH-STRENGTH SPRING AND WIRE FOR HIGH-STRENGTH SPRING USING SAME
Title (en)
ROLLED STEEL MATERIAL FOR HIGH-STRENGTH SPRING AND WIRE FOR HIGH-STRENGTH SPRING USING SAME
Title (de)
GEWALZTES STAHLMATERIAL FÜR HOCHFESTE FEDER UND DRAHT FÜR HOCHFESTE FEDER DAMIT
Title (fr)
MATIÉRIAU D'ACIER LAMINÉ POUR RESSORT À HAUTE RÉSISTANCE ET CÂBLE POUR RESSORT À HAUTE RÉSISTANCE L'UTILISANT
Publication
Application
Priority
- JP 2013272569 A 20131227
- JP 2014082728 W 20141210
Abstract (en)
An object of the present invention is to provide a rolled material for high strength spring, which has excellent wire drawability even when suppressing the addition amount of an alloying element, and which can exhibit corrosion fatigue properties after quenching and tempering. The present invention provides a rolled material for high strength spring, including C, Si, Mn, P, S, Al, Cu and Ni, wherein an amount of nondiffusible hydrogen is 0.40 ppm by mass or less, and an area ratio of ferrite expressed as a percentage satisfies an inequality expression (1) below, and a total area ratio of bainite and martensite is 2% or less: Ferrite area ratio < 0.77 C / 0.77 C / 3 + 0.08 × 100 where [name of element] in the above inequality expression (1) means a content expressed in % by mass of each element.
IPC 8 full level
C22C 38/00 (2006.01); B21C 1/00 (2006.01); C21D 3/06 (2006.01); C21D 8/06 (2006.01); C21D 9/52 (2006.01); C22C 38/16 (2006.01); C22C 38/54 (2006.01)
CPC (source: EP KR US)
B21C 1/00 (2013.01 - EP US); B21C 1/003 (2013.01 - US); C21D 1/18 (2013.01 - EP US); C21D 3/06 (2013.01 - EP US); C21D 8/06 (2013.01 - EP KR US); C21D 8/065 (2013.01 - EP US); C21D 9/52 (2013.01 - EP KR US); C21D 9/525 (2013.01 - EP US); C22C 38/00 (2013.01 - EP KR US); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR US); C22C 38/06 (2013.01 - EP KR US); C22C 38/08 (2013.01 - EP US); C22C 38/12 (2013.01 - EP US); C22C 38/14 (2013.01 - EP US); C22C 38/16 (2013.01 - EP US); C22C 38/34 (2013.01 - EP KR US); C22C 38/42 (2013.01 - EP KR US); C22C 38/44 (2013.01 - EP KR US); C22C 38/46 (2013.01 - EP KR US); C22C 38/48 (2013.01 - EP KR US); C22C 38/50 (2013.01 - EP US); C22C 38/54 (2013.01 - EP US); C21D 2211/002 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US); C21D 2211/008 (2013.01 - EP US); C21D 2211/009 (2013.01 - EP US); C21D 2261/00 (2013.01 - EP US)
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
DOCDB simple family (publication)
EP 3088551 A1 20161102; EP 3088551 A4 20170823; CN 105849297 A 20160810; CN 109112262 A 20190101; JP 2015143391 A 20150806; JP 6212473 B2 20171011; KR 20160102526 A 20160830; MX 2016008501 A 20160914; TW 201538747 A 20151016; TW I535860 B 20160601; US 2016319393 A1 20161103; WO 2015098531 A1 20150702
DOCDB simple family (application)
EP 14875039 A 20141210; CN 201480070614 A 20141210; CN 201811092603 A 20141210; JP 2014082728 W 20141210; JP 2014248907 A 20141209; KR 20167020136 A 20141210; MX 2016008501 A 20141210; TW 103143676 A 20141215; US 201415107994 A 20141210