Publication number: 20230235425
Abstract: A hot-rolled strip steel product is described having a chemical composition consisting of, in terms of weight percentages (wt. %): 0.030%-0.10% C, 0%-1.10% Si, 0.50%-2.0% Mn, <0.020% P, <0.010% S,<0.010% N, 0%-0.60% Cr, 0%-0.20% Ni, 0%-0.25% Cu, 0%-0.30% Mo, 0%-0.15% Al, 0%-0.10% Nb, 0.10%-0.30% V, <0.020% Ti, 0%-0.0010% B, remainder being Fe and inevitable impurities, wherein the hot rolled strip steel product has a a microstructure comprising, in terms of volume percentages (vol. %), ferrite?90, wherein the ferrite structure comprises bainite, at least 50% of polygonal ferrite and at most 10% quasi-polygonal ferrite, and wherein the steel strip product has an average hole expansion ratio?50%, a yield strength (Rp0.2%) longitudinal to rolling direction of ?660 MPa and a tensile strength?760 MPa.
Type:
Application
Filed:
May 20, 2021
Publication date:
July 27, 2023
Inventors:
Vili Kesti, Ari Hirvi, Tommi Liimatainen, Mikko Hemmilä, Pasi Suikkanen, Erik Nymann, Martin Lind, Robin Nilsson, Juha Pyykkönen