Global Patent Index - EP 3674432 A4

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

EP 3674432 A4 20201216 (EN)

Application

EP 17922610 A 20170825

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)

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