EP 1980635 A4 20101201 - STEEL SHEET WITH EXCELLENT SUITABILITY FOR FINE BLANKING AND PROCESS FOR PRODUCING THE SAME
Title (en)
STEEL SHEET WITH EXCELLENT SUITABILITY FOR FINE BLANKING AND PROCESS FOR PRODUCING THE SAME
Title (de)
STAHLBLECH MIT HERVORRAGENDER FEINSTANZUNGSEIGNUNG UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
FEUILLE D'ACIER CONVENANT PARFAITEMENT A UN DECOUPAGE FIN ET SON PROCEDE DE PRODUCTION
Publication
Application
Priority
- JP 2007051835 W 20070129
- JP 2006023104 A 20060131
Abstract (en)
[origin: EP1980635A1] A steel sheet excellent in FB performance and also excellent in fabrication performance after FB working and a manufacturing method of the same are provided. The steel sheet is a steel sheet having a composition containing from 0.1 to 0.5 % of C, not more than 0.5 % of Si and from 0.2 to 1.5 % of Mn in terms of % by mass, with P and S being adjusted at proper ranges, and having a structure in which a ferrite has an average grain size of from 1 to 10 µm, a cementite has a spheroidization ratio of 80 % or more, and of the cementites, an amount S gb of a ferrite intergranular cementite which is defined by the following expression (1) : S gb (%) = {S on /(S on + S in )} × 100 (wherein S on represents a total occupied area of a cementite present on the ferrite grain boundary of the cementites present per unit area; and S in represents a total occupied area of a cementite present in a ferrite grain of the cementites present per unit area) is 40 % or more. In this way, the steel sheet becomes a steel sheet excellent in FB performance, mold life and performance after FB working.
IPC 8 full level
C21D 9/46 (2006.01); C22C 38/00 (2006.01)
CPC (source: EP KR US)
C21D 1/18 (2013.01 - EP KR US); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR US); C22C 38/44 (2013.01 - KR); C22C 38/50 (2013.01 - KR); C22C 38/54 (2013.01 - KR); C21D 2211/005 (2013.01 - EP KR US)
Citation (search report)
- [A] JP H0347922 A 19910228 - NIPPON STEEL CORP
- [A] JP H07224354 A 19950822 - NISSHIN STEEL CO LTD
- [A] JP 2000248330 A 20000912 - NISSHIN STEEL CO LTD
- [A] FUJITA TAKESHI ET AL: "High-Carbon Steel Sheets for Power Train Parts__Formable High-Carbon Steel Sheets Suitable for One-Piece Forming__", J F E TECHNICAL REPORT, J F E R & D CORP, JP, no. 4, 1 November 2004 (2004-11-01), pages 44 - 49, XP002562361, ISSN: 1348-0677, Retrieved from the Internet <URL:http://www.jfe-steel.co.jp/en/research/report/004/pdf/004-08pdf ORD - 2004-11-00>
- See references of WO 2007088985A1
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 1980635 A1 20081015; EP 1980635 A4 20101201; EP 1980635 B1 20120111; CN 101379208 A 20090304; CN 101379208 B 20120620; KR 101023633 B1 20110322; KR 20080077254 A 20080821; US 2009173415 A1 20090709; WO 2007088985 A1 20070809
DOCDB simple family (application)
EP 07713798 A 20070129; CN 200780004180 A 20070129; JP 2007051835 W 20070129; KR 20087016379 A 20070129; US 15901007 A 20070129