C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 8/02 (2006.01) C22C 38/04 (2006.01)
Patent
CA 2533023
The invention relates to a hot rolled sheet which is made from austenitic iron/carbon/manganese steel and which has a resistance of greater than 900 MPa, whereby: resistance (MPa) x elongation at rupture (%) is greater than 45000. The chemical composition of the inventive sheet comprises the following concentrations expressed as weight: 0.5 % = C = 0.7 %, 17 % = Mn = 24 %, Si = 3 %, Al = 0.05 %, S = 0.03 %, P = 0.08 %, N = 0.1 % and, optionally, one or more elements such as Cr = 1 %, Mo = 0.4 %, Ni = 1 %, Ti = 0.5 %, Nb = 0.5 %, V = 0.5 %, Cu = 5 %, Cu = 5 %, the rest of the composition comprising iron and impurities resulting from production. According to the invention, the recrystallised fraction of the steel is greater than 75 % and the surface fraction of precipitated carbides of the steel is less than 1.5 %, the average grain size of the steel being less than 18 micrometers.
L'invention concerne une tôle laminée à chaud en acier austénitique fer- carbone-manganèse dont la résistance est supérieure à 900 MPa, dont le produit : résistance (MPa) x allongement à rupture (%), est supérieur à 45000, dont la composition chimique comprend, les teneurs étant exprimées en poids : 0,5 % <= C <= 0,7 %, 17 % <= Mn <= 24 %, Si <= 3 %, AI <= 0,050 %, S <= 0,030 %, P <= 0,080 %, N <= 0,1 %, et à titre optionnel, un ou plusieurs éléments tels que Cr <= 1 %, Mo <= 0,40 %, Ni <= 1 %, Ti <= 0,50 %, Nb <= 0,50 %, V <= 0,50 %, Cu <= 5 %, Cu <= 5 %, le reste de la composition étant constitué de fer et d'impuretés résultant de l'élaboration, la fraction recristallisée de l'acier étant supérieure à 75 % et la fraction surfacique de carbures précipités de l'acier inférieure à 1,5 %, la taille moyenne de grain de l'acier étant inférieure à 18 microns.
Bouzekri Mohamed
Faral Michel
Scott Colin
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Usinor
LandOfFree
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