Production of thin steel strip

B - Operations – Transporting – 22 – D

Patent

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Details

B22D 11/06 (2006.01) B21B 1/46 (2006.01) B22D 11/112 (2006.01) B22D 11/124 (2006.01) B22D 11/22 (2006.01) C21D 8/02 (2006.01) B21B 37/76 (2006.01) C21D 1/18 (2006.01)

Patent

CA 2422144

A plain carbon steel strip (12) is continuously cast in a twin roll caster (11) and passes to a run out table 17 on which it is subjected to accelerated cooling by means of cooling headers (18) whereby it is cooled to transform the strip from austenite to ferrite at a temperature range between 850 ~C and 400 ~C at a cooling rate of not less than 90 ~C/sec, such that the strip has a yield strength of greater than 450MPa. The strip after casting and before cooling is passed through a hot rolling mill to reduce the thickness of strip by at least 15% and up to 50%.

L'invention concerne une bande d'acier noir au carbone (12) qui est coulée en continu dans un couleur à deux rouleaux (11) et qui est passée sur une table de sortie (17) sur laquelle elle est soumise à un refroidissement accéléré au moyen de tubes de refroidissement (18) afin d'être transformée d'austénite en ferrite à une température comprise entre 850 ·C et 400 ·C à une vitesse de refroidissement qui n'est pas inférieure à 90 ·C/sec, de sorte que la bande présente une limite d'élasticité supérieure à 450 MPa. Après avoir été coulée et avant d'être refroidie, on fait passer la bande dans un laminoir à chaud afin de réduire l'épaisseur de la bande d'au moins 15 % et jusqu'à 50 %.

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