Method for making hardenable steel plates by firing,...

C - Chemistry – Metallurgy – 21 – D

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C21D 8/04 (2006.01) C21D 8/02 (2006.01) C21D 9/52 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01)

Patent

CA 2502079

The invention concerns a method for making hardenable steel plates by firing comprising: preparing a steel whereof the composition comprises, expressed in weight percent: 0.03 = C = 0.06, 0.50 = Mn = 1.10, 0.08: = Si = 0.20, 0.015 = Al = 0.070, N = 0.007, Ni = 0.040, Cu = 0.040, P = 0.035,S = 0.015, Mo = 0.010, Ti = 0.005; provided that it comprises boron in an amount such that 0.64 = B/N¿ ?= 1.60 the rest consisting of iron and impurities resulting from production; casting a slab of said steel, then hot rolling of said slab to obtain a plate, the final rolling temperature being higher than the point Ar3; winding said plate at a temperature ranging between 500 and 700 ·C; then cold rolling of said plate at a reduction rate ranging between 50 and 80 %; continuous annealing heat treatment for a time interval less than 15 minutes; and strain hardening with a reduction rate ranging between 1.25 and 2.5 %. The invention also concerns the hardenable plates and the parts obtainable therefrom.

L'invention concerne un procédé de fabrication de tôles d'acier durcissables par cuisson comprenant - l'élaboration d'un acier dont la composition comprend, exprimées en en poids, 0,03 <= C <= 0,06, 0,50 <= Mn <= 1,10, 0,08: <= Si <= 0,20, 0,015 <= Al <=, 070, N <= 0,007, Ni <= 0,040, Cu <= 0,040, P <= 0,035,S <= 0,015, Mo <= 0,010, Ti <= 0,005 ; étant entendu qu'elle comprend également du bore en une quantité telle que 0,64 <= BN<= 1,60 le reste de la composition étant constitué de fer et d'impuretés résultant de l'élaboration, - la coulée d'une brame de cet acier, puis un laminage à chaud de cette brame pour obtenir une tôle, la température de fin de laminage étant supérieure à celle du point Ar3, - un bobinage de ladite tôle à une température comprise entre 500 et 700~C, puis - un laminage à froid de ladite tôle avec un taux de réduction de 50 à 80%, - un traitement thermique de recuit en continu d'une durée inférieure à 15 minutes, et un écrouissage réalisé avec un taux de réduction compris entre 1,2 et 2,5%, ainsi que les tôles durcissables et les pièces pouvant être obtenues.

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