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1. WO2007144516 - DUPLEX STAINLESS STEEL

Publication Number WO/2007/144516
Publication Date 21.12.2007
International Application No. PCT/FR2007/000994
International Filing Date 15.06.2007
IPC
C22C 38/18 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
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
C21D 8/02 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
8Modifying the physical properties by deformation combined with, or followed by, heat treatment
02during manufacturing of plates or strips
CPC
B21B 1/26
BPERFORMING OPERATIONS; TRANSPORTING
21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
BROLLING OF METAL
1Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section
22for rolling ; plates, strips,; bands or sheets of indefinite length
24in a continuous ; or semi-continuous; process
26by hot-rolling ; , e.g. Steckel hot mill
C21D 2211/005
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 BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
2211Microstructure comprising significant phases
005Ferrite
C21D 6/002
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
6Heat treatment of ferrous alloys
002containing Cr
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 BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
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 BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
6Heat treatment of ferrous alloys
005containing Mn
C21D 6/007
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
6Heat treatment of ferrous alloys
007containing Co
Applicants
  • INDUSTEEL CREUSOT [FR]/[FR] (AllExceptUS)
  • UGITECH [FR]/[FR] (AllExceptUS)
  • BONNEFOIS, Bernard [FR]/[FR] (UsOnly)
  • PEULTIER, Jérôme [FR]/[FR] (UsOnly)
  • SERRIERE, Mickael [FR]/[FR] (UsOnly)
  • HAUSER, Jean-Michel [FR]/[FR] (UsOnly)
  • CHAUVEAU, Eric [FR]/[FR] (UsOnly)
Inventors
  • BONNEFOIS, Bernard
  • PEULTIER, Jérôme
  • SERRIERE, Mickael
  • HAUSER, Jean-Michel
  • CHAUVEAU, Eric
Agents
  • PLAISANT, Sophie
Priority Data
06290991.616.06.2006EP
Publication Language French (FR)
Filing Language French (FR)
Designated States
Title
(EN) DUPLEX STAINLESS STEEL
(FR) ACIER INOXYDABLE DUPLEX
Abstract
(EN)
The invention relates to a duplex stainless steel composition consisting, in percent by weight, of: C < 0.05%; 21% ≤ Cr < 25%; 1% ≤ Ni ≤ 2.95%; 0.16% ≤ N ≤ 0.28%; Mn ≤ 2.0% Mo +W/2 ≤ 0.50%; Mo ≤ 0.45%; W < 0.15%; Si < 1.4%; Al < 0.05%; 0.11% ≤ Cu ≤ 0.50%; S < 0.010%; P ≤ 0.040%; Co ≤ 0.5%; REM ≤ 0.1%; V ≤ 0.5%; Ti ≤ 0, 1%; Nb ≤ 0.3%; Mg < 0.1%, the balance being iron and impurities resulting from the smelting, and the microstructure consisting of austenite and 35 to 65% ferrite by volume, the composition furthermore satisfying the following relationships: 40 ≤ IF < 70 with IF = 6´(%Cr + 1.32´%Mo + 1.27´%Si) - 10´(%Ni + 24´%C + 16.15´%N + 0.5´%Cu + 0.4´%Mn) - 6.17 and IRCL > 30.5, where IRCL = %Cr +3.3´%Mo +16´%N + 2.6´%Ni - 0.7´%Mn, and to a process for manufacturing plates, sheets, coils, bars, wires, sections, forgings and castings made of this steel.
(FR)
L'invention concerne une composition d'acier inoxydable duplex, dont la composition est constituée de, en % en poids : C < 0,05 % 21 % ≤ Cr < 25 % 1 % ≤ Ni ≤ 2,95% 0,16 % ≤ N ≤ 0,28 % Mn ≤ 2,0 % Mo +W/2 ≤ 0,50 % Mo ≤ 0,45% W < 0,15 % Si < 1,4% Al < 0,05 % 0,11% ≤ Cu ≤ 0,50 % S < 0,010 % P ≤ 0,040 % Co ≤ 0,5 % • REM ≤ 0,1 % V ≤ 0,5 % Ti ≤ 0, 1 % Nb ≤ 0,3 % Mg < 0,1 % le reste étant du fer et des impuretés résultant de l'élaboration et la microstructure étant constituée d'austénite et de 35 à 65% de ferrite en volume, la composition respectant en outre les relations suivantes : 40 ≤ IF < 70 avec IF = 6 x (%Cr + 1,32 x %Mo + 1,27&khgr; %Si) - 10x (%Ni + 24 x %C + 16,15 x %N + 0,5 x %Cu + 0,4 x %Mn) - 6,17 et IRCL > 30,5 avec IRCL = %Cr +3,3 x %Mo +16 x %N + 2,6 x %Ni - 0,7 x %Mn ainsi qu'un procédé de fabrication de tôles, bandes, bobines, barres, fils, profilés, pièces forgées, pièces moulées en cet acier.
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