Cold rolled steel sheet having excellent machinability and...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/14 (2006.01) C21D 8/02 (2006.01) C21D 8/04 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01)

Patent

CA 2151951

A cold-rolled steel sheet having excellent cold workability in spite of its having a high nitrogen content for the purpose or recycling scrap iron. The sheet contains at most 0.1 % of carbon, 60-150 ppm of nitrogen, at most 0.4 % of manganese, at most 0.030 % of sulfur (provided Mn/S >= 7), at most 0.1 % of aluminum and at most 0.08 % of titanium (provided N (%) - Ti/3.42 (%) <= 0.007), and at least one half by weight of TiN which is a size of 0.05-10 µm. When it is produced through continuous annealing, the condition of N (%) - Ti/3.42 (%) <= 0.004 % must be satisfied and it is further necessary to conduct high-temperature winding in the hot rolling step or to add boron. When it is produced through box annealing, the condition of 0.002 % <= N (%)- Ti/3.42 (%) <= 0.007 % must be satisfied and it is further necessary to somewhat raise the slab heating temperature in the hot rolling step and lower the winding temperature in this step.

L'invention concerne une tôle d'acier laminée à froid qui présente une excellente aptitude au façonnage à froid malgré sa haute teneur en azote, cela à des fins de recyclage de la ferraille. Ladite tôle contient au maximum 0,1 % de carbone, 60-150 ppm d'azote, au maximum 0,4 % de manganèse, au maximum 0,030 % de soufre (à condition que Mn/S >= 7), au maximum 0,1 % d'aluminium et au maximum 0,08 % de titane (à condition que N (%) - Ti/3,42 (%) <= 0,007), et au moins la moitié en poids de TiN dont la taille des particules est comprise entre 0,05-10 µm. Lorsqu'une telle tôle est produite par recuit en continu, la condition selon laquelle N (%), Ti/3,42 (%) <= 0,004 % doit être satisfaite, et il faut en outre effectuer, pendant l'étape de laminage à chaud, un enroulement à haute température, ou bien ajouter du bore. Lorsque ladite tôle est produite par recuit en caisse, la condition selon laquelle 0,002 % <= N (%) - Ti/3,42 (%) <= 0,007 % doit être satisfaite, et il faut en outre augmenter un peu la température de chauffage de la brame pendant l'étape de laminage à chaud, et abaisser la température pendant l'étape d'enroulement.

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