High strength hot rolled steel sheet excelling in bore...

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 38/00 (2006.01) C21D 9/46 (2006.01) C22C 38/14 (2006.01) C22C 38/16 (2006.01)

Patent

CA 2520022

A high strength hot rolled steel sheet of about 1.0 to 6.0 mm thickness and 980 N/mm2 or higher strength excelling in bore expandability, ductility and chemical convertibility, which high strength hot rolled steel sheet is pressed into automobile under carriage parts, etc. In particular, a high strength hot rolled steel sheet comprising, by mass, 0.01 to 0.09% of C, 0.05 to 1.5% of Si, 0.5 to 3.2% of Mn, 0.003 to 1.5% of Al, 0.03% or less of P, 0.005% or less of S, 0.10 to 0.25% of Ti and 0.01 to 0.05% of Nb, provided that C, Ti, Nb and Mn satisfy all the formulae 0.9 <= 48/12×C/Ti < 1.7 (1), 50227×C - 4479×Mn > -9860 (2) and 811×C + 135×Mn + 602×Ti + 794×Nb > 465 (3), with the balance composed of iron and unavoidable impurities.

L'invention concerne un tôle d'acier laminée à chaud à haute résistance d'une épaisseur allant d'environ 1,0 à 6,0 mm et d'une résistance de 980 N/mm?2 ¿ou supérieure, présentant une dilatabilité d'âme, une ductilité et une convertibilité chimique excellentes, laquelle tôle d'acier laminée à chaud à haute résistance est pressée en pièces de carrosserie d'automobile, etc. L'invention concerne notamment une tôle d'acier laminée à chaud à haute résistance comprenant, exprimé en masse, 0,01 à 0,09 % de C, 0,05 à 1,5 % de Si, 0,5 à 3,2 % de Mn, 0,003 à 1,5 % d'Al 0,03 % ou moins de P, 0,005 % ou moins de S, 0,10 à 0,25 % de Ti et 0,01 à 0,05 % de Nb, à condition que C, Ti, Nb et Mn satisfassent toutes les formules (1) 0,9 <= 48/12xC/Ti < (2) 1,7, (2) 50227xC 4479xMn > -9860 et (3) 811xC + 135xMn +602xTi + 794xNb > 465, le solde étant constitué de fer et d'impuretés inévitables.

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