EP 3674432 A4 20201216 - WEAR-RESISTANT STEEL SHEET HAVING EXCELLENT TOUGHNESS
Title (en)
WEAR-RESISTANT STEEL SHEET HAVING EXCELLENT TOUGHNESS
Title (de)
VERSCHLEISSFESTES STAHLBLECH MIT AUSGEZEICHNETER ZÄHIGKEIT
Title (fr)
TÔLE D'ACIER RÉSISTANTE À L'USURE PRÉSENTANT UNE EXCELLENTE TÉNACITÉ
Publication
Application
Priority
JP 2017030614 W 20170825
Abstract (en)
[origin: EP3674432A1] To achieve both the "wear resistance" and the "toughness" to high levels for a non-tempered material. A steel sheet: having a chemical composition containing, in terms of percentage by mass, from 0.60 to 1.25% of C, 0.50% or less of Si, from 0.30 to 1.20% of Mn, 0.030% or less of P, 0.030% or less of S, from 0.30 to 1.50% of Cr, from 0.10 to 0.50% of Nb, from 0 to 0.50% of Ti, from 0 to 0.50% of Mo, from 0 to 0.50% of V, from 0 to 2.00% of Ni, and the balance of Fe, with unavoidable impurities; having a metal structure containing a ferrite phase as a metal matrix having dispersed therein cementite particles and particles of a carbide containing one or more kind of Nb and Ti (which may be hereinafter referred to as a "Nb·Ti based carbide"); and having, on a cross sectional surface in parallel to a rolling direction and a thickness direction (i.e., an L cross section), a number density of the Nb·Ti based carbide particles having a circle equivalent diameter of 0.5 µm or more of from 3,000 to 9,000 per mm<sup>2</sup>and a number density of voids having a circle equivalent diameter of 1.0 µm or more of 1,250 per mm<sup>2</sup>or less.
IPC 8 full level
C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/04 (2006.01); C22C 38/50 (2006.01)
CPC (source: EP KR US)
C21D 1/30 (2013.01 - US); C21D 8/0226 (2013.01 - US); C21D 8/0236 (2013.01 - US); C21D 8/0263 (2013.01 - EP); C21D 8/0268 (2013.01 - EP); C21D 8/0426 (2013.01 - KR); C21D 8/0436 (2013.01 - KR); C21D 8/0473 (2013.01 - KR); C21D 9/46 (2013.01 - EP KR); C22C 38/02 (2013.01 - US); C22C 38/04 (2013.01 - US); C22C 38/12 (2013.01 - EP); C22C 38/14 (2013.01 - EP); C22C 38/44 (2013.01 - KR); C22C 38/48 (2013.01 - KR); C22C 38/50 (2013.01 - EP KR US); C21D 2211/006 (2013.01 - EP); C22C 38/04 (2013.01 - EP)
Citation (search report)
- [E] JP 2017190494 A 20171019 - NISSHIN STEEL CO LTD
- [Y] JP 2015190037 A 20151102 - NISSHIN STEEL CO LTD
- [Y] JP 2011012316 A 20110120 - NIPPON STEEL CORP
- [E] EP 3323904 A1 20180523 - NISSHIN STEEL CO LTD [JP]
- [A] JP 2015190036 A 20151102 - NISSHIN STEEL CO LTD
- [A] JP 2016222990 A 20161228 - NIPPON STEEL & SUMITOMO METAL CORP
- See references of WO 2019038923A1
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 3674432 A1 20200701; EP 3674432 A4 20201216; CN 111373064 A 20200703; KR 20200044879 A 20200429; US 2020199702 A1 20200625; WO 2019038923 A1 20190228
DOCDB simple family (application)
EP 17922610 A 20170825; CN 201780094374 A 20170825; JP 2017030614 W 20170825; KR 20207008415 A 20170825; US 201716634671 A 20170825