High resistance steel band or sheet and method for the...

C - Chemistry – Metallurgy – 21 – D

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C21D 8/04 (2006.01) C21D 8/02 (2006.01) C21D 9/46 (2006.01) C22C 38/02 (2006.01) C22C 38/32 (2006.01) C22C 38/38 (2006.01) C21D 9/52 (2006.01)

Patent

CA 2380969

The invention relates to a higher-strength steel strip or steel sheet comprising a predominantly ferritic- martensitic microstructure with a martensite content of between 4 and 20 %, wherein the steel strip or steel sheet, apart from Fe and impurities due to smelting, comprises (in % by weight) 0.05 - 0.2 % C, <= 1.0 % Si, 0.8 - 2:0 % Mn, <= 0.1 % P, <= 0.015 % S, 0.02 - 0.4 % Al, <= 0.005 % N, 0.25 - 1.0 % Cr, 0.002 - 0.01 % B. Preferably the martensite content is approximately 5 % to 20 % of the predominantly martensitic-ferritic microstructure. Such a higher-strength steel strip or steel sheet made from a dual phase steel comprises good mechanical/technological properties even after being subjected to an annealing process which includes an overageing treatment. Furthermore, the invention relates to a method for producing steel strip or steel sheet according to the invention.

L'invention concerne une feuille ou une tôle d'acier très résistante, présentant une structure essentiellement ferritique et martensitique, la teneur en martensite se situant entre 4 et 20 %. En plus du fer et des impuretés consécutives à la fusion, cette feuille ou tôle d'acier contient (en % en poids) 0,05 - 0,2 % C, </= 1,0 % Si, 0,8 - 2,0 % Mn, </= 0,1 % P, </= 0,015 % S, 0,02 - 0,4 % Al, </= 0,005 % N, 0,25 - 1,0 % Cr, 0,002 - 0,01 % B. De préférence, la teneur en martensite varie entre 5 % et 20 % de la structure essentiellement ferritique et martensitique. Une telle feuille ou tôle d'acier très résistante, réalisée à partir d'un acier biphasé, présente de bonnes propriétés mécaniques et technologiques, même après un processus de recuit incluant un traitement de survieillissement. L'invention concerne également un procédé de fabrication d'une feuille ou d'une tôle d'acier selon l'invention.

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