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1. IN202037044790 - HIGH-STRENGTH SHEET STEEL AND METHOD FOR MANUFACTURING SAME

Office
India
Application Number 202037044790
Application Date 14.10.2020
Publication Number 202037044790
Publication Date 04.12.2020
Publication Kind A
IPC
C22C 38/06
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
06containing aluminium
C22C 38/60
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
60containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
C21D 8/02
CCHEMISTRY; METALLURGY
21METALLURGY OF IRON
DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING, OR OTHER TREATMENTS
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
Applicants JFE STEEL CORPORATION
Inventors ENDO, Kazuki
KAWASAKI, Yoshiyasu
TOJI, Yuki
FUNAKAWA, Yoshimasa
AOYAMA, Mai
Priority Data 2018-066715 30.03.2018 JP
Title
(EN) HIGH-STRENGTH SHEET STEEL AND METHOD FOR MANUFACTURING SAME
Abstract
(EN)
This high-strength sheet steel is characterized in that: the steel structure comprises, in terms of areal proportions, 35-80% ferrite, 5-35% martensite, and 0-5% tempered martensite, and at least 8% retained austenite in terms of volumetric proportion; further, the average ferrite crystal particle size is 6 µm or less, the average retained austenite crystal particle size is 3 µm or less, and the value of the areal proportion of blocky austenite divided by the total areal proportion of lath austenite and blocky austenite is at least 0.6; the value of the average Mn content of the retained austenite divided by the average Mn content of the ferrite is at least 1.5; and the value of the average C content of the retained austenite divided by the average C content of the ferrite is at least 3.0.

Also published as
MXMX/a/2020/010211
TH2001005668