Method and device for the continuous creation of a bainite...

C - Chemistry – Metallurgy – 21 – D

Patent

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C21D 1/20 (2006.01) C21D 1/607 (2006.01) C21D 1/63 (2006.01) C21D 9/56 (2006.01) C21D 9/573 (2006.01) C21D 9/58 (2006.01) C21D 1/25 (2006.01) C21D 8/02 (2006.01) C21D 8/04 (2006.01)

Patent

CA 2627538

The invention relates to a method for continuously creating a bainite structure in a carbon steel, especially a strip steel. Said method comprises the following steps: the carbon steel (1) is austenitized (3) at a temperature exceeding the austenitizing temperature; the austenitized carbon steel (1) is introduced into a bath (2) containing a quenching agent (21) in order to cool the carbon steel (1) to a temperature lying below the austenitizing temperature; the carbon steel (1) is adjusted to the transformation temperature for bainite and is maintained (13) at said transformation temperature for a certain period of time; and the carbon steel is then cooled (17). In order to further develop said method, the carbon steel (1) penetrates a bath (2) containing a quenching agent (21) until a defined percentage of the bainite structure relative to the total structure of the carbon steel (1) has formed in the bath (2) containing the quenching agent (21) following the austenitizing process, residues of the quenching agent (21) are removed from the surface of the carbon steel (1) by blowing the same off when the carbon steel (1) is discharged from the bath (2), and the remaining structure components of the carbon steel (1) are then transformed into bainite in an isothermal tempering station (13) without deflecting the carbon steel (1) at all when the same penetrates the isothermal tempering station (13).

La présente invention concerne un procédé pour former en continu une structure de bainite dans un acier au carbone, en particulier dans un acier feuillard. Ce procédé consiste au austénitiser (3) l'acier au carbone (1) à une température supérieure à la température d'austénitisation, à introduire l'acier au carbone austénitisé (1) dans un bain (2) comprenant un milieu de trempe (21) afin de refroidir l'acier au carbone (1) jusqu'à une température inférieure à la température d'austénitisation, à régler l'acier au carbone (1) à la température de transformation pour la bainite, puis à maintenir (13) l'acier au carbone (1) pendant une période à cette température de transformation et à refroidir (17) l'acier au carbone. Ce procédé est amélioré en ce que, après l'austénitisation, l'acier au carbone (1) traverse un bain (2) comprenant un milieu de trempe (21) jusqu'à ce qu'une partie pouvant être déterminée de la structure de bainite ait été formée sur la structure globale de l'acier au carbone dans le bain (2) comprenant le milieu de trempe (21). Lorsque l'acier au carbone (1) sort du bain (2), des résidus du milieu de trempe (21) sont retirés de la surface de l'acier au carbone (1) au moyen d'un soufflage, puis la transformation restante des composants de la structure de l'acier au carbone (1) en bainite a lieu dans une station de thermorégulation isotherme (13), sans déviation de l'acier au carbone (1) lorsqu'il traverse la station de thermorégulation isotherme (13).

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