C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 8/02 (2006.01) C21D 6/00 (2006.01) C22C 38/04 (2006.01)
Patent
CA 2584455
The invention relates to a method for production of a cold-laminated sheet of stainless austenitic iron/carbon/manganese steel, comprising the following steps: a sheet is provided, the chemical composition of which is, by weight, 0.35 % < C < 1.05 %, 16 %< Mn < 24 %, the remainder being iron and unavoidable production impurities, said sheet is cold-laminated, a recrystallisation annealing is carried out on said sheet in a furnace, containing a gas selected from the gases which are reducing with relation to iron, the annealing parameters being selected such that said sheet is covered on both faces with a sub-layer of essentially amorphous oxide (FeMn)O and an outer layer of crystalline manganese oxide MnO, the total thickness of the two layers being greater than or equal to 0.5 micrometers.
L'invention concerne un procédé de fabrication d'une tôle laminée à froid en acier austénitique fer-carbone-manganèse, résistante à la corrosion, comprenant les étapes suivantes : On approvisionne une tôle dont la composition chimique comprend, les teneurs étant exprimées en poids : 0,35% < C < 1 ,05%, 16%< Mn < 24%, le reste de la composition étant constitué de fer et d'impuretés inévitables résultant de l'élaboration, on lamine à froid ladite tôle, on effectue un recuit de recristallisation sur ladite tôle dans un four contenant un gaz choisi parmi les gaz réducteurs vis à vis du fer, les paramètres du recuit étant choisis de telle sorte que ladite tôle soit couverte sur ses deux faces d'une sous-couche d'oxyde (FeMn)O essentiellement amorphe et d'une couche externe d'oxyde de manganèse MnO cristallin, l'épaisseur totale de ces deux couches étant supérieure ou égale à 0,5 micromètre.
Bouleau Daniel
Drillet Pascal
Arcelor France
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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