EP 1484424 B1 20100825 - Ferritic stainless steel sheet excellent in press formability and secondary formability and its manufacturing method
Title (en)
Ferritic stainless steel sheet excellent in press formability and secondary formability and its manufacturing method
Title (de)
Rostfreier ferritischer Bandstahl mit hervorragenden Press- sowie sekundären Verformungseigenschaften und Verfahren zu seiner Herstellung
Title (fr)
Acier inoxydable ferritique présentant une aptitude elévée à la déformation par pression et à la déformation secondaire et son procéde de fabrication
Publication
Application
Priority
JP 2003159275 A 20030604
Abstract (en)
[origin: EP1484424A1] A ferritic stainless steel sheet has a composition of C up to 0.02 mass %, Si up to 0.8 mass %, Mn up to 1.5 mass %, P up to 0.050 mass %, S up to 0.01 mass %, 8.0-35.0 mass % of Cr, N up to 0.05 mass %, 0.05-0.40 mass % of Ti and 0.10-0.50 mass % of Nb with a product of (%Tix%N) less than 0.005. Precipitates of 0.15 mu m or more in particle size except TiN are distributed in a steel matrix at a rate of 5000-50000/mm<2>. The steel sheet is manufactured by hot-rolling a slab at a finish-temperature of 800 DEG C or lower, annealing the hot-rolled steel sheet at 450-1080 DEG C, cold-rolling the hot-rolled steel sheet in accompaniment with intermediate-annealing at a temperature within a range of from (a recrystallization-finishing temperature -100 DEG C) to (a recrystallization-finishing temperature) and then finish-annealing the cold-rolled steel sheet at 1080 DEG C or lower. The ferritic stainless steel sheet is press-formed with high dimensional accuracy and excellent secondary formability due to controlled distribution of the precipitates. <IMAGE>
IPC 8 full level
C21D 9/46 (2006.01); C22C 38/26 (2006.01); C21D 8/02 (2006.01); C21D 8/04 (2006.01); C22C 38/00 (2006.01); C22C 38/18 (2006.01); C22C 38/28 (2006.01); C22C 38/54 (2006.01)
CPC (source: EP KR US)
C21D 8/0405 (2013.01 - EP US); C21D 8/0468 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/18 (2013.01 - KR); C22C 38/26 (2013.01 - EP US); C22C 38/28 (2013.01 - EP US); C21D 8/0463 (2013.01 - EP US); C21D 8/0473 (2013.01 - EP US)
Designated contracting state (EPC)
DE ES FR
DOCDB simple family (publication)
EP 1484424 A1 20041208; EP 1484424 B1 20100825; CN 100363523 C 20080123; CN 1572895 A 20050202; DE 602004028780 D1 20101007; ES 2357303 T3 20110425; JP 2004360003 A 20041224; JP 3886933 B2 20070228; KR 100595383 B1 20060630; KR 20040104939 A 20041213; US 2004244884 A1 20041209; US 2009165905 A1 20090702
DOCDB simple family (application)
EP 04012345 A 20040525; CN 200410046247 A 20040604; DE 602004028780 T 20040525; ES 04012345 T 20040525; JP 2003159275 A 20030604; KR 20040041004 A 20040604; US 39696609 A 20090303; US 86034904 A 20040603