High-strength steel sheet and method of producing molten...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/14 (2006.01) C22C 33/04 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01)

Patent

CA 2727224

A high-strength steel sheet includes: 0.03 to 0.20% of C, 0.08 to 1.5% of Si, 0.5 to 3.0% of Mn, 0.05% or less of P, 0.0005% or more of S, 0.008 to 0.20% of acid--soluble Ti, 0.0005 to 0.01% of N, more than 0.01% of acid-soluble Al, and 0.001 to 0.04% of one or both of Ce and La in terms of mass%; and the balance including Fe and inevitable impurities. The ratio of (Ce+La)/acid-soluble Al is equal to or more than 0.1 and the ratio of (Ce+La)/S is in the range of 0.4 to 50 in a mass base, and the density of the number of inclusions, having a circle equivalent diameter of 2 µm or less, which are present in the steel sheet is equal to or more than 15/mm2.

L'invention concerne une tôle d'acier très résistante contenant, en terme de % en masse, de 0,03 à 0,20 % de C, de 0,08 à 1,5 % de Si, de 0,5 à 3,0 % de Mn, jusqu'à 0,05 % de P, au moins 0,0005 % de S, de 0,008-0,20 % de Ti soluble dans un acide, de 0,0005 à 0,01 % de N, plus de 0,01 % d'Al soluble dans un acide, et de 0,001 à 0,04 % de Ce et/ou La, à condition que (masse de Ce+La)/(masse d'Al soluble dans un acide)= 0,1 soit satisfait et que (Ce+La)/S soit de 0,4 à 50 en masse. Le reste de la composition est constitué de fer et d'impuretés secondaires. Dans la tôle d'acier, les particules d'inclusion ayant un diamètre de cercle équivalent de 2 µm ou moins sont présentes en un nombre de 15 ou plus par mm2.

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