Cold-rolled thick sheet steel with good deep drawability,...

Details Cold-rolled thick sheet steel with good deep drawability,... Cold-rolled thick sheet steel with good deep drawability,...

C - Chemistry, Metallurgy

22

C

C22C 38/14 (2006.01) C21D 8/04 (2006.01) C21D 9/46 (2006.01) C22C 38/06 (2006.01) C22C 38/12 (2006.01) C22C 38/60 (2006.01)

Patent

CA 2267363

A steel slab having a composition that comprises at most 0.008 % by weight of C, at most 0.5 % by weight of Si, at most 1.0 % by weight of Mn, at most 0.15 % by weight of P, at most 0.02 % by weight of S, from 0.01 to 0.10 % by weight of Al, at most 0.008 % by weight of N, from 0.035 to 0.20 % by weight of Ti, and from 0.001 to 0.015 % by weight of Nb, with a balance of Fe and inevitable impurities, in which those C, S, N, Ti and Nb satisfy the following condition: 1.2(C/12 + N/14 + S/32) < (Ti/48 + Nb/93), is subjected to rough hot-rolling to a reduction ratio of not lower than 85 %, at a temperature falling between the Ar3 transformation point of the steel and 950°C, then to finishing hot-rolling to a reduction ratio of not lower than 65 %, at a temperature falling between 600°C and the Ar3 transformation point of the steel, while being lubricated, to thereby have a mean shear strain of not larger than 0.06, then pickled, pre-annealed at a temperature falling between 700 and 920°C, cold-rolled to a reduction ratio of not lower than 65 %, and thereafter further annealed for recrystallization at a temperature falling between 700 and 920°C. The method of the invention provides thick cold-rolled sheet steel having a thickness of not smaller than 1.2 mm and having an r value of not smaller than 2.9.

L'invention concerne une plaque d'acier épaisse, laminée à froid, ayant une valeur <u>r</u> d'au moins 2,9 même quand son épaisseur est supérieure ou égale à 1,2 mm; et un procédé permettant de fabriquer ladite plaque. Selon le procédé, on effectue un laminage à chaud de dégrossissage d'une brame d'acier renfermant au plus, en poids, 0,008 % de C; 0,5 % de Si; 1,0 % de Mn; 0,15 % de P; 0,02 % de S; 0,01-0,10 % d'Al; 0,008 % de N; 0,035-0,20 % de Ti; 0,001-0,015 % de Nb, les teneurs en C, S, N, Ti et Nb satisfaisant la relation 1,2(C/12+N/14+S/32) < (Ti/48+Nb/93), et le solde étant constitué de Fe et des impuretés inévitables, à une température comprise entre au moins le point de transformation de Ar3 et au plus 950 DEG C, avec un étirage d'au moins 85 %; on effectue un laminage à chaud de finissage de la plaque, tout en la lubrifiant, à une température comprise entre au moins 600 DEG C et au plus le point de transformation d'Ar3, avec un étirage d'au moins 65 %, de façon que la déformation moyenne au cisaillement soit d'au plus 0,06; on décape la plaque d'acier; on la soumet à un recuit de plaque mère à une température comprise entre 700 et 920 DEG C; on effectue le laminage à froid de la plaque avec un étirage d'au moins 65 %; et on recuit la plaque d'acier afin de la faire recristalliser à une température comprise entre 700 et 920 DEG C.

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