EP 3385399 A4 20190522 - NON-HEAT-TREATED STEEL SHEET HAVING HIGH YIELD STRENGTH IN WHICH HARDNESS OF A WELDING-HEAT-AFFECTED ZONE AND DEGRADATION OF LOW-TEMPERATURE TOUGHNESS OF THE WELDING-HEAT-AFFECTED ZONE ARE SUPPRESSED
Title (en)
NON-HEAT-TREATED STEEL SHEET HAVING HIGH YIELD STRENGTH IN WHICH HARDNESS OF A WELDING-HEAT-AFFECTED ZONE AND DEGRADATION OF LOW-TEMPERATURE TOUGHNESS OF THE WELDING-HEAT-AFFECTED ZONE ARE SUPPRESSED
Title (de)
WÄRMEUNBEHANDELTES STAHLBLECH MIT HOHER STRECKGRENZE UND UNTERDRÜCKTER HÄRTE EINER SCHWEISSHITZEBEEINTRÄCHTIGTEN ZONE SOWIE UNTERDRÜCKTER DEGRADATION DER TIEFTEMPERATURZÄHIGKEIT DER SCHWEISSHITZEBEEINTRÄCHTIGTEN ZONE
Title (fr)
TÔLE D'ACIER NON TRAITÉE THERMIQUEMENT AYANT UNE LIMITE ÉLASTIQUE ÉLEVÉE DANS LAQUELLE LA DURETÉ D'UNE ZONE AFFECTÉE PAR LA CHALEUR DE SOUDAGE ET LA DÉGRADATION DE LA TÉNACITÉ À BASSE TEMPÉRATURE DE LA ZONE AFFECTÉE PAR LA CHALEUR DE SOUDAGE SONT SUPPRIMÉES
Publication
Application
Priority
- JP 2015237839 A 20151204
- JP 2016084857 W 20161124
Abstract (en)
[origin: EP3385399A1] To provide a non-heat-treated steel plate having high yield strength in which hardness of a weld heat-affected zone and degradation of low-temperature toughness of the weld heat-affected zone are suppressed. The steel wire rod of the present disclosure includes predetermined components in steel, wherein Ceq defined by the formula (1) below is less than 0.44, an A value defined by the formula (2) below is 2.50 or more, and a B value defined by the formula (3) below is 2.37 or more, and wherein area ratios of metal structures in a 1/4 position of a thickness of the steel plate satisfy bainite: 80% by area or more, and martensite-austenite constituent: 0% by area or more and 0.26% by area or less, and wherein a maximum hardness of the bainite is 270 HV or more. Ceq = C + Mn / 6 + Cu + Ni / 15 + Cr + Mo + V / 5 A value = 1.15 × Mn + 2.20 × Mo + 6.50 × Nb B value = 1.20 × Mn + 0.50 × Ni + 4.25 × Nb
IPC 8 full level
C22C 38/00 (2006.01); C21D 8/02 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP KR)
B21C 37/08 (2013.01 - EP); C21D 8/02 (2013.01 - KR); C21D 8/0226 (2013.01 - EP); C21D 9/46 (2013.01 - EP); C22C 38/001 (2013.01 - EP KR); C22C 38/002 (2013.01 - EP); C22C 38/005 (2013.01 - EP); C22C 38/02 (2013.01 - EP KR); C22C 38/04 (2013.01 - EP KR); C22C 38/06 (2013.01 - EP KR); C22C 38/08 (2013.01 - EP); C22C 38/12 (2013.01 - EP KR); C22C 38/14 (2013.01 - EP KR); C22C 38/16 (2013.01 - EP); C22C 38/20 (2013.01 - EP); C22C 38/22 (2013.01 - EP); C22C 38/24 (2013.01 - EP); C22C 38/26 (2013.01 - EP); C22C 38/28 (2013.01 - EP); C22C 38/32 (2013.01 - EP); C22C 38/38 (2013.01 - EP); C22C 38/42 (2013.01 - EP); C22C 38/46 (2013.01 - EP); C22C 38/48 (2013.01 - EP); C22C 38/50 (2013.01 - EP); C22C 38/54 (2013.01 - EP); C22C 38/58 (2013.01 - EP); C21D 2211/002 (2013.01 - EP KR); C21D 2211/005 (2013.01 - EP)
Citation (search report)
- [A] JP 2006169591 A 20060629 - KOBE STEEL LTD
- [A] EP 2505682 A1 20121003 - JFE STEEL CORP [JP]
- [A] JP 2008101242 A 20080501 - JFE STEEL KK
- [A] EP 2505683 A1 20121003 - JFE STEEL CORP [JP]
- [A] EP 2441854 A1 20120418 - NIPPON STEEL CORP [JP]
- [A] WO 2015151469 A1 20151008 - JFE STEEL CORP [JP]
- [A] JP 2013237101 A 20131128 - KOBE STEEL LTD
- [A] JP 2013194316 A 20130930 - JFE STEEL CORP
- [A] WO 2014148447 A1 20140925 - KOBE STEEL LTD [JP]
- See references of WO 2017094593A1
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 3385399 A1 20181010; EP 3385399 A4 20190522; CN 108350540 A 20180731; JP 2017106107 A 20170615; KR 20180085791 A 20180727; WO 2017094593 A1 20170608
DOCDB simple family (application)
EP 16870530 A 20161124; CN 201680064618 A 20161124; JP 2016084857 W 20161124; JP 2016228335 A 20161124; KR 20187018576 A 20161124