Method and apparatus for producing martensite- or...

C - Chemistry – Metallurgy – 21 – D

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C21D 8/02 (2006.01) B21B 1/34 (2006.01) B21B 37/74 (2006.01) C21D 9/00 (2006.01) B21B 1/46 (2006.01) B21B 15/00 (2006.01) B21B 45/00 (2006.01) B21B 45/02 (2006.01)

Patent

CA 2332933

A steel rolling mill including a Steckel mill is provided with an in-line upstream quench station located downstream of the caster and upstream of the reheat furnace, a shear located downstream of the Steckel mill, and a temperature reduction station downstream of the shear. The upstream quench station has spray nozzles that quench a surface layer of the steel to transform same from an austenitic to a non-austenitic microstructure. The shear provides a precise transverse vertical face on the leading end of the steel. The temperature reduction station applies cooling fluid to the rolled steel so as to obtain a preferred microstructure that may be either bainite or martensite. If bainite, the temperature reduction station includes laminar-flow cooling apparatus; if martensite, the station also includes an initial rapid quench, in which latter case the station is followed by a tempering furnace.

L'invention concerne une laminerie d'acier comprenant un laminoir de type Steckel équipé d'un poste de trempage (14) en amont en ligne placé en aval du couleur (11) et en amont du four de réchauffage (15), une cisaille (25) est placée en aval du laminoir de type Steckel (19) et un poste de réduction de température se trouve en aval de la cisaille (27, 28). Le poste de trempage en amont est doté de buses de pulvérisation servant à abaisser brusquement la température d'une couche de surface de l'acier dont on veut transformer la microstructure austénitique en une microstructure non austénitique. La cisaille (25) permet d'obtenir une face verticale transversale précise sur l'extrémité de l'acier. Le poste de réduction de température (27, 28) applique un fluide de refroidissement sur l'acier laminé de manière à obtenir une microstructure préférée qui peut être de la bainite ou de la martensite. Dans le cas de la bainite, le poste de réduction de température comprend un appareil de refroidissement à flux laminaire, dans le cas de la martensite, le poste, doté d'un dispositif de trempage (28) rapide initial, précède un four à tremper (37).

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