C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/04 (2006.01) C21D 8/02 (2006.01) C23C 2/06 (2006.01) C23C 2/28 (2006.01) C23C 2/40 (2006.01)
Patent
CA 2720702
The invention is directed to providing, for application in automobiles, construction materials, household appliances and the like, high-strength sheets excellent in formability properties such as hole expansibility and ductility, and also in fatigue resistance, characterized in comprising, in specified contents expressed in mass%, C, Si, Mn, P, S, Al, N and O and a balance of iron and unavoidable impurities, and having a steel sheet structure composed mainly of ferrite and hard structures, a crystal orientation difference between some ferrite adjacent to hard structures and the hard structures of less than 9°, and a maximum tensile strength of 540 MPa or greater.
L'invention propose des tôles d'acier à haute résistance qui présentent une excellente aptitude à l'ébarbage, une excellente ductilité et d'excellentes caractéristiques de fatigue et qui conviennent pour les automobiles, les matériaux de construction, les appareils électriques domestiques, etc. L'invention concerne une tôle d'acier à haute résistance dont la composition contient C, Si, Mn, P, S, Al, N et O en quantités prescrites en % en masse, le solde étant Fe et les impuretés inévitables, et dont la structure est principalement constituée de ferrite et d'une phase dure, caractérisée en ce que la différence d'orientation des cristaux entre la phase dure et la ferrite adjacente est inférieure à 9° et en ce que la tôle présente une résistance maximale en traction de 540 MPa ou plus.
Azuma Masafumi
Maruyama Naoki
Murasato Akinobu
Suzuki Noriyuki
Yoshinaga Naoki
Goudreau Gage Dubuc
Nippon Steel Corporation
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