High strength steel sheet and method for manufacturing the same

Details High strength steel sheet and method for manufacturing the same High strength steel sheet and method for manufacturing the same

C - Chemistry, Metallurgy

22

C

C22C 38/60 (2006.01) C21D 9/46 (2006.01) C23C 2/06 (2006.01) C23C 2/28 (2006.01)

Patent

CA 2713195

Disclosed are an ultra-high-strength steel sheet having both a tensile strength of as high as 1400MPa or above and excellent formability and an advantageous process for manufacturing the same. A high-strength steel sheet having both a composition which contains by mass C: 0.12 to 0.50%, Si: 2.0% or less, Mn: 1.0 to 5.0%, P: 0.1% or less, S: 0.07% or less, Al: 1.0% or less, and N: 0.008% or less with the balance being Fe and unavoidable impurities, and a structure which comprises, in terms of area fraction, autotempered martensite: 80% or more, ferrite: less than 5%, bainite: 10% or less, and retained austenite: 5% or less and in which the average number of precipitated iron carbide particles of 5nm to 0.5 /1 m in the autotempered martensite is 5OE10 4 or above per mm2.

L'invention concerne une tôle d'acier ultra résistante ayant une résistance à la traction égale ou supérieure à 1400MPa et une excellente formabilité et son procédé de fabrication est avantageux. Une tôle d'acier à haute résistance présente à la fois une composition contenant en masse C: 0,12 à 0,50%, Si: 2,0% au maximum, Mn: 1,0 à 5,0%, P: 0,1% au maximum, S: 0,07% au maximum, Al: 1,0% au maximum, et N: 0,008% au maximum, le complément étant Fe et des impuretés inévitables, et une structure qui comprend, en termes de fraction surfacique, de la martensite trempée automatiquement: 80% ou plus, de la ferrite: moins de 5%, de la bainite: 10% au maximum, et de l'austénite résiduelle: 5% au maximum et dans laquelle le nombre moyen de particules de carbure de fer précipitées de 5nm à 0,5µm dans la martensite trempée automatiquement est d'au moins 5x104 mm2.

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