C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/04 (2006.01) C21D 7/02 (2006.01) C21D 8/02 (2006.01) C21D 9/46 (2006.01)
Patent
CA 2587858
The invention relates to a hot rolled sheet which is made from austenitic iron/carbon/manganese steel and which has a strength of greater than 1200 MPa, of which the product P (resistance (MPa) x elongation at rupture (%)) is greater than 65000 MPa %. The nominal chemical composition of the inventive sheet comprises the following concentrations expressed as weight: 0.85 %<= C<= 1.05 %, 16 %<= Mn<=19 %, Si <=2 %, Al <=0.050 %, S<=0.030 %, P<=0.050 %, N<=0.1 %, and, optionally, one or more elements selected from among Cr<=1 %, Mo<=0.40 %, Ni<=1 %, Cu<=5 %, Ti<=0.50 %, Nb<=0.50 %, V<= 0.50 %, the rest of the composition comprising iron and inevitable impurities resulting from production. According to the invention, the recrystallised surface fraction of the steel is equal to 100 %, the surface fraction of precipitated carbides of said steel is equal to 0 % and the average grain size thereof is less than or equal to 10 micrometers.
Tôle laminée à chaud en acier austénitique fer-carbone-manganèse dont la résistance est supérieure à 1200 MPa, dont le produit P (résistance (MPa) x allongement à rupture (%)) est supérieur à 65000 MPa%, dont la composition chimique nominale comprend, les teneurs étant exprimées en poids : 0,85% <= C <= 1,05%, 16%<= Mn <= 19%, Si <=2%, Al <=0,050%, S <=0,030%, P<= 0,050%, N <=0,1 %, et à titre optionnel, un ou plusieurs éléments choisis parmi : Cr <=1%, Mo <= 0,40%, Ni <= 1 %, Cu <=5%, Ti <= 0,50%, Nb <=0,50%, V <= 0,50%, le reste de la composition étant constitué de fer et d'impuretés inévitables résultant de l'élaboration, la fraction surfacique recristallisée dudit acier étant égale à 100%, la fraction surfacique de carbures précipités dudit acier étant égale à 0%, la taille moyenne de grain dudit acier étant inférieure ou égale à 10 microns
Cugy Philippe
Guelton Nicolas
Scott Colin
Stouvenot Francois
Theyssier Marie-Christine
Arcelor France
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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