C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 8/04 (2006.01) B21B 1/46 (2006.01) B21B 3/00 (2006.01) B22D 11/00 (2006.01) B22D 11/06 (2006.01) B22D 11/12 (2006.01) B22D 11/22 (2006.01) C21D 8/00 (2006.01) C21D 9/46 (2006.01) C22C 38/00 (2006.01) C22C 38/04 (2006.01) C22C 38/16 (2006.01)
Patent
CA 2473050
The invention relates to a method for producing a siderurgical product made of carbon steel having a high copper content, according to which: - a liquid steel having the composition: 0.0005 % <= C <= 1 %; 0.5 <= Cu <= 10 %; 0 <= Mn <= 2 %; 0 <= Si <= 5 %; 0 <= Ti <= 0.5 %; 0 <= Nb <= 0.5 %; 0 <= Ni <= 5 %; 0 <= Al <= 2 %, the remainder being iron and impurities, is produced; - said liquid steel is poured directly in the form of a thin strip having a thickness of no more than 10 mm; - the strip is subjected to forced cooling and/or is surrounded by a non-oxidizing atmosphere while having a temperature of more than 1000? C; - said thin strip is hot rolled at a reduction rate of at least 10 %, the temperature at the end of the rolling process being such that all of the copper is still in a solid solution in the ferrite and/or austenite matrix; - the strip is then subjected to forced cooling so as to maintain the copper in an oversaturated solid solution in the ferrite and/or austenite matrix; - and the strip is coiled. The invention also relates to a siderurgical product obtained according to said method.
L 'invention concerne un procédé de fabrication d'un produit sidérurgique en acier au carbone riche en cuivre, selon lequel : - on élabore un acier liquide ayant la composition : 0,0005% <= C <= 1%; 0,5 <= Cu <= 10% ; 0 Mn <= 2%; 0 <= Si <= 5%; 0 <= Ti <= 0,5% ; 0 <= Nb <= 0,5%; 0 <= Ni <= 5% ; 0 <= Al <= 2%, le reste étant du fer et des impureté s; on coule cet acier liquide directement sous forme d'une bande mince d'épaisseur inférieure ou égale à 10 mm - tant que la bande est à plus de 1000~C, on lui fait subir un refroidissement forcé et/ou on l'entoure d'une atmosphère non oxydante; on fait subir à la bande mince un laminage à chaud à un taux de réduction d'au moins 10%, la tempé rature de fin de laminage étant telle qu'à cette température, tout le cuivre se trouve encore en solution solide dans la matrice de ferrite et/ou d'austénite ; - on fait ensuite subir à la bande un refroidissement forcé de manière à maintenir le cuivre en solution solide sursaturée dans la matrice de ferrite et/ou d'austénite ;et on bobine la bande. L'invention concerne également un produit sidérurgique ainsi obtenu.
Birat Jean=pierre
Faral Michel
Guelton Nicolas Patrice
Juckum Catherine
Robic
Usinor
LandOfFree
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