C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/38 (2006.01) C21D 8/02 (2006.01) C22C 38/02 (2006.01) C22C 38/24 (2006.01) C22C 38/28 (2006.01) C22C 38/32 (2006.01) C22C 38/34 (2006.01) C23C 2/06 (2006.01) C23C 2/40 (2006.01)
Patent
CA 2718304
This cold-rolled steel sheet includes, in terms of mass %, C: not less than 0.05% and not more than 0.095%, Cr: not less than 0.15% and not more than 2.0%, B: not less than 0.0003% and not more than 0.01%, Si: not less than 0.3% and not more than 2.0%, Mn: not less than 1.7% and not more than 2.6%, Ti: not less than 0.005% and not more than 0.14%, P: not more than 0.03%, S: not more than 0.01 %, Al: not more than 0.1 %, N: less than 0.005%, O: not less than 0.0005% and not more than 0.005%, and contains as the remainder, iron and unavoidable impurities, wherein the microstructure of the steel sheet includes mainly polygonal ferrite having a crystal grain size of not more than 4 µm, and hard microstructures of bainite and martensite, the block size of the martensite is not more than 0.9 µm, the Cr content within the martensite is 1.1 to 1.5 times the Cr content within the polygonal ferrite, and the tensile strength is at least 880 MPa.
L'invention porte sur une tôle d'acier laminée à froid qui contient, en masse 0,05-0,095 % de C, 0,15-2,0 % de Cr, 0,0003-0,01 % de B, 0,3-2,0 % de Si, 1,7-2,6 % de Mn, 0,005-0,14 % de Ti, 0,03 % ou moins de P, 0,01 % ou moins de S, 0,1 % ou moins d'Al, moins de 0,005 % de N et 0,0005-0,005 % de O, le reste comprenant du fer et des impuretés inévitables. La composition de tôle d'acier possède une ferrite polygonale dont la taille de grain est généralement égale ou inférieure à 4 µm et des compositions dures de bainite et de martensite, la dimension de bloc de la martensite n'étant pas supérieure à 0,9 µm et le volume de Cr contenu dans la martensite étant de 1,1-1,5 fois la quantité de Cr contenu dans la ferrite polygonale. La résistance à la rupture en traction de la tôle d'acier est supérieure ou égale à 880 MPa.
Azuma Masafumi
Maruyama Naoki
Sakuma Yasuharu
Suzuki Noriyuki
Yoshinaga Naoki
Goudreau Gage Dubuc
Nippon Steel Corporation
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