Hot-rolling steel strip

Details Hot-rolling steel strip Hot-rolling steel strip

C - Chemistry, Metallurgy

21

D

C21D 8/02 (2006.01) B21B 1/26 (2006.01) B21B 1/46 (2006.01)

Patent

CA 2284635

The invention relates to a method for producing strips of non-alloy and low- alloy steel with homogeneous structures and properties by continuous hot- rolling, by passing several times in the austenite zone and then in the ferrite zone, as well as by reeling. The invention is characterized in that the steel strip that was continuously cast and/or rough rolled in the austenite zone is rolled by passing twice or more in the austenite zone, at a starting temperature TAr3 +30 ~C with a total strain of eh30 %. After each pass, the rolled product is intensively cooled until completion of the ferrite conversion. The rolled product is then subjected to final rolling by passing several times through the ferrite zone, with a total strain of en60 %, until a final thickness is obtained.

L'invention concerne un procédé de production de bandes d'acier non allié et faiblement allié, présentant des structures et des propriétés homogènes, par laminage à chaud continu, dans chaque cas en plusieurs passes dans la zone de l'austénite, puis dans celle de la ferrite, ainsi que par bobinage. Cette invention se caractérise en ce que le feuillard d'acier coulé en continu et/ou prélaminé dans la zone de l'austénite, est laminé en deux phases ou plus dans la zone de l'austénite, en partant d'une température T?Ar¿3? + 30 ·C avec un taux de déformation globale e¿h??30 %. Après chaque passe, le produit laminé est refroidi de manière intense jusqu'à ce que la conversion de la ferrite soit terminée. Le produit laminé est ensuite soumis en plusieurs passes à un laminage final dans la zone de la ferrite, avec un taux de déformation globale e¿h??60 %, jusqu'à obtention de l'épaisseur finale.

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