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1. WO2018002426 - MARTENSITIC STAINLESS STEEL AND METHOD FOR THE MANUFACTURE

Publication Number WO/2018/002426
Publication Date 04.01.2018
International Application No. PCT/FI2017/050449
International Filing Date 15.06.2017
IPC
C22C 38/58 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
58with more than 1.5% by weight of manganese
C22C 38/50 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
50with titanium or zirconium
C22C 38/46 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
46with vanadium
C22C 38/42 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
42with copper
C22C 38/48 2006.01
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
18containing chromium
40with nickel
48with niobium or tantalum
C21D 9/46 2006.01
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
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
46for sheet metals
CPC
C21D 6/004
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, e.g. BY DECARBURISATION OR TEMPERING
6Heat treatment of ferrous alloys
004containing Cr and Ni
C21D 6/005
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, e.g. BY DECARBURISATION OR TEMPERING
6Heat treatment of ferrous alloys
005containing Mn
C21D 8/0247
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, e.g. BY DECARBURISATION OR TEMPERING
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
0247characterised by the heat treatment
C21D 8/0263
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, e.g. BY DECARBURISATION OR TEMPERING
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
0247characterised by the heat treatment
0263following hot rolling
C21D 9/46
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, e.g. BY DECARBURISATION OR TEMPERING
9Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
46for sheet metals
C22C 38/001
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
001containing N
Applicants
  • OUTOKUMPU OYJ [FI]/[FI]
Inventors
  • ANTTILA, Severi
  • KAUPINMÄKI, Tatu
Agents
  • OUTOKUMPU OYJ, GROUP R&D
Priority Data
2016554230.06.2016FI
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) MARTENSITIC STAINLESS STEEL AND METHOD FOR THE MANUFACTURE
(FR) ACIER INOXYDABLE MARTENSITIQUE ET SON PROCÉDÉ DE FABRICATION
Abstract
(EN)
The invention relates to a martensitic stainless steel and its manufacturing method having high strength and enhanced tensile ductility. The steel consists of in weight % equal or less than 0.05 % C, equal or less than 1.0 % Si, 2.0 – 5 8.0 % Mn, 10.5 – 18.0 % Cr, 0.4 – less than 4.0 % Ni, equal or less than 1.5 % Mo, equal or less than 1.0 % Cu, equal or less than 0.05 % N, equal or less than 0.1 % Al, optionally at least one of the following group containing equal or less than 0.8 % Ti, equal or less than 0.8 % Nb, equal or less than 0.8% Zr, equal or less than 0.8 % V, the rest being iron and evitable impurities occupying 10 in stainless steels in such conditions, that the Ductility Index (DI) = γcomp - 0.03 * Ms ≥0 where γcomp = 54.7 - 432 * (C+N)FCC - 6.43 * SiFCC - 0.603 * MnFCC - 2.572 * CrFCC - 0.818 * NiFCC - 0.157 * HJ, HJ = T * (c + log10 t) / 1000 and 15 T is temperature in degrees Kelvin and c is a constant, when the Ms temperature is at the range of 50 – 350°C.
(FR)
Cette invention concerne un acier inoxydable martensitique et son procédé de fabrication présentant une résistance élevée et une ductilité en traction améliorée. Ledit acier comprend, en pourcentage en poids, 0,05 % ou moins de C, 1,0 % ou moins de Si, 2,0 à 58 % de Mn, 10,5 à 18,0 % de Cr, 0,4 à moins de 4,0 % de Ni, 1,5 % ou moins de Mo, 1,0 % ou moins de Cu, 0,05 % ou moins de N, 0,1 % ou moins d'Al, optionnellement au moins un élément du groupe ci-après comprenant 0,8 % ou moins de Ti, 0,8 % ou moins de Nb, 0,8 % ou moins de Zr, 0,8 % ou moins de V, le reste étant du fer et les inévitables impuretés se produisant dans les aciers inoxydables dans de telles conditions, l'indice de ductilité (ID) = γcomp - 0,03 * Ms ≥ 0 où γcomp = 54,7 - 432 * (C+N)FCC - 6,43 * SiFCC - 0,603 * MnFCC - 2,572 * CrFCC - 0,818 * NiFCC -0,157 * HJ, HJ = T * (c + log10 t)/1000 et T est la température en degrés Kelvin et c est une constante, lorsque la température Ms est dans la plage de 50 à 350 ˚C.
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