Global Patent Index - EP 2687620 A4

EP 2687620 A4 20141015 - STEEL SHEET FOR HOT-STAMPED MEMBER AND PROCESS FOR PRODUCING SAME

Title (en)

STEEL SHEET FOR HOT-STAMPED MEMBER AND PROCESS FOR PRODUCING SAME

Title (de)

STAHLBLECH FÜR HEISSGESTANZTE ELEMENTE UND VERFAHREN ZU SEINER HERSTELLUNG

Title (fr)

FEUILLE D'ACIER POUR UN ÉLÉMENT ESTAMPÉ À CHAUD ET SON PROCÉDÉ DE FABRICATION

Publication

EP 2687620 A4 20141015 (EN)

Application

EP 12760551 A 20120316

Priority

  • JP 2011060893 A 20110318
  • JP 2012056917 W 20120316

Abstract (en)

[origin: EP2687620A1] A steel sheet for obtaining a member which is excellent in fatigue characteristics equal to ordinary high strength steel sheet of the same strength even if applying the hot stamping process and a method of production of the same are provided. Steel sheet for a hot stamped member which includes composition which contains, by mass%, C: 0.15 to 0.35%, Si: 0.01 to 1.0%, Mn: 0.3 to 2.3%, Al: 0.01 to 0.5%, and a balance of Fe and unavoidable impurities, and limit the impurities to P: 0.03% or less, S: 0.02% or less, and N: 0.1% or less, wherein that a standard error of Vicker's hardness at a position of 20 µm from the steel sheet surface in the sheet thickness direction is 20 or less. This steel sheet is produced by a recrystallizationannealing step of a first stage of heating a cold rolled steel sheet, which is obtained by hot rolling steel containing the above composition and then cold rolling it, by an average heating rate of 8 to 25°C/sec from room temperature to 600 to 700°C, then a second stage of heating by an average heating rate of 1 to 7°C/sec to 720 to 820°C.

IPC 8 full level

C22C 38/00 (2006.01); C21D 1/18 (2006.01); C21D 9/00 (2006.01); C22C 38/06 (2006.01); C22C 38/58 (2006.01); C23C 2/02 (2006.01); C23C 2/06 (2006.01); C23C 2/12 (2006.01); C23C 2/28 (2006.01)

CPC (source: EP KR US)

C21D 1/18 (2013.01 - EP KR US); C21D 1/673 (2013.01 - EP US); C21D 6/00 (2013.01 - EP US); C21D 8/0205 (2013.01 - EP US); C21D 8/0226 (2013.01 - EP KR US); C21D 8/0236 (2013.01 - EP KR US); C21D 8/0247 (2013.01 - EP KR US); C21D 8/0273 (2013.01 - EP KR US); C21D 9/46 (2013.01 - EP US); C21D 9/48 (2013.01 - EP US); C22C 1/02 (2013.01 - EP US); C22C 38/001 (2013.01 - EP KR US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/08 (2013.01 - US); C22C 38/12 (2013.01 - EP US); C22C 38/14 (2013.01 - EP US); C22C 38/16 (2013.01 - KR US); C22C 38/28 (2013.01 - EP KR US); C22C 38/32 (2013.01 - EP KR US); C22C 38/38 (2013.01 - KR US); C23C 2/02 (2013.01 - EP US); C23C 2/06 (2013.01 - EP KR US); C23C 2/12 (2013.01 - EP US); C23C 2/28 (2013.01 - EP US); Y10T 428/12757 (2015.01 - EP US); Y10T 428/12799 (2015.01 - EP US)

Citation (search report)

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 2687620 A1 20140122; EP 2687620 A4 20141015; BR 112013023792 A2 20161206; CA 2829327 A1 20120927; CA 2829327 C 20170214; CN 103443317 A 20131211; JP 5605503 B2 20141015; JP WO2012128225 A1 20140724; KR 20130126714 A 20131120; MX 2013010601 A 20131001; MX 360240 B 20181026; RU 2013146540 A 20150427; RU 2560890 C2 20150820; US 2014004378 A1 20140102; WO 2012128225 A1 20120927; ZA 201307377 B 20140625

DOCDB simple family (application)

EP 12760551 A 20120316; BR 112013023792 A 20120316; CA 2829327 A 20120316; CN 201280013800 A 20120316; JP 2012056917 W 20120316; JP 2013505953 A 20120316; KR 20137024832 A 20120316; MX 2013010601 A 20120316; RU 2013146540 A 20120316; US 201214004809 A 20120316; ZA 201307377 A 20131002