Hot rolled steel sheet for processing and method for...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/00 (2006.01) C21D 9/46 (2006.01) C22C 38/06 (2006.01) C22C 38/54 (2006.01)

Patent

CA 2539072

A hot rolled steel sheet for working, which has a chemical composition, in mass %, that C: 0.01 to 0.2 %, Si: 0.01 to 0.3 %, Mn: 0.1 to 1.5 %, P: <= 0.1 %, S: <= 0.03 %, Al: 0.001 to 0.1 %, N: <= 0.006 %, and the balance: Fe and inevitable impurities, and has a micro structure comprising a polygonal ferrite phase as a primary phase and a second hard phase, wherein the second hard phase is present in a volume percentage of 3 to 20 %, the hardness ratio (hardness of second hard phase/hardness of polygonal ferrite) is 1.5 to 6, and the grain diameter ratio (grain diameter of second hard phase/grain diameter of polygonal ferrite) is 1.5 or more.

L'invention concerne une tôle d'acier laminée à chaud à travailler, dont la composition chimique exprimée en pourcentage massique est la suivante : C : 0,01 à 0,2 %, Si : 0,01 à 0,3 %, Mn : 0,1 à 1,5 %, P : <= 0,1 %, S : <= 0,03 %, Al : 0,001 à 0,1 %, N : <= 0,006 %, le reste étant constitué de fer et d'impuretés inévitables. Cette tôle d'acier laminée à chaud présente une microstructure composée d'une phase ferritique polygonale en tant que phase primaire et d'une seconde phase dure, cette seconde phase dure étant présente dans un pourcentage volumique de 3 à 20 %, le rapport de dureté (dureté de la seconde phase dure/dureté de la ferrite polygonale) étant de 1,5 à 6 et le rapport de diamètre de grain (diamètre de grain de la seconde phase dure/diamètre de grain de la ferrite polygonale) étant supérieur ou égal à 1,5.

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