EP 3604587 A1 20200205 - HOT-ROLLED STEEL SHEET, FORGED STEEL PART AND PRODUCTION METHODS THEREFOR
Title (en)
HOT-ROLLED STEEL SHEET, FORGED STEEL PART AND PRODUCTION METHODS THEREFOR
Title (de)
WARMGEWALZTES STAHLBLECH, STAHLBLECHTEIL UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
TÔLE D'ACIER LAMINÉE À CHAUD, PIÈCE EN ACIER FORGÉ ET PROCÉDÉS DE PRODUCTION ASSOCIÉS
Publication
Application
Priority
JP 2017013749 W 20170331
Abstract (en)
A hot rolled steel sheet having a chemical composition consisting of, in mass %, C: 0.020-0.070%, Si: 0.05-1.70%, Mn: 0.60-2.50%, Al: 0.005-0.020%, N: > 0.0030-0.0060%, P ≤ 0.050%, S ≤ 0.005%, Ti: 0.015-0.170%, Nb: 0-0.100%, V: 0-0.300%, Cu: 0-2.00%, Ni: 0-2.00%, Cr: 0-2.00%, Mo: 0-1.00%, B: 0-0.0100%, Ca: 0-0.0100%, Mg: 0-0.0100%, REM: 0-0.1000%, Zr: 0-1.000%, Co: 0-1.000%, Zn: 0-1.000%, W: 0-1.000%, Sn: 0-0.050%, the balance: Fe and impurities, wherein Ca + Mg + REM ≥ 0.0005, a metal microstructure includes, in area %, ferrite: 5-70%, bainite: 30-95%, retained γ ≤ 2%, martensite ≤ 2%, pearlite ≤ 1%, ferrite + bainite ≥ 95%, a number density of the precipitates in ferrite grains is 1.0 × 10<sup>16</sup>-50.0 × 10<sup>16</sup>/cm<sup>3</sup>, an average circle-equivalent diameter of the TiN precipitates in the steel sheet is 1.0-10.0 µm, an average of minimum distances between adjacent TiN precipitates is 10.0 µm or more, and a standard deviation of nano hardness is 1.00 GPa or less.
IPC 8 full level
C22C 38/00 (2006.01); C21D 9/46 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP KR US)
C21C 7/04 (2013.01 - EP); C21C 7/06 (2013.01 - EP KR); C21D 1/02 (2013.01 - EP US); C21D 1/19 (2013.01 - EP); C21D 6/005 (2013.01 - EP); C21D 6/008 (2013.01 - EP); C21D 8/005 (2013.01 - US); C21D 8/0215 (2013.01 - EP US); C21D 8/0226 (2013.01 - EP US); C21D 8/0236 (2013.01 - US); C21D 8/0263 (2013.01 - EP); C21D 8/0415 (2013.01 - EP); C21D 8/0426 (2013.01 - EP); C21D 8/0463 (2013.01 - EP); C21D 9/46 (2013.01 - EP KR); C21D 9/48 (2013.01 - EP); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - US); C22C 38/005 (2013.01 - US); C22C 38/008 (2013.01 - 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 - US); C22C 38/14 (2013.01 - EP US); C22C 38/16 (2013.01 - US); C22C 38/32 (2013.01 - US); C22C 38/42 (2013.01 - KR); C22C 38/58 (2013.01 - KR); C21D 2211/001 (2013.01 - US); C21D 2211/002 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US); C21D 2211/008 (2013.01 - US); C21D 2211/009 (2013.01 - 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 3604587 A1 20200205; EP 3604587 A4 20200909; BR 112019017622 A2 20200324; CN 110475890 A 20191119; JP 6332571 B1 20180530; JP WO2018179391 A1 20190411; KR 20190126100 A 20191108; MX 2019011711 A 20191121; US 2020024679 A1 20200123; WO 2018179391 A1 20181004
DOCDB simple family (application)
EP 17904326 A 20170331; BR 112019017622 A 20170331; CN 201780089327 A 20170331; JP 2017013749 W 20170331; JP 2017559726 A 20170331; KR 20197028709 A 20170331; MX 2019011711 A 20170331; US 201716485360 A 20170331