C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/02 (2006.01) C21D 1/19 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/34 (2006.01) C22C 38/38 (2006.01)
Patent
CA 2645059
The invention relates to a hot-rolled steel sheet having a strength greater than 1200 MPa, an Re/Rm ratio of less than 0.75 and an elongation at break of greater than 10%, the composition of which comprises, the contents being expressed by weight: 0.10% <= C <= 0.25%; 1% <= Mn < 3%; Al >= 0.015%; Si <= 1.985%; Mo < 0.30%; Cr <= 1.5%; S < 0.015%; P <= 0.1%, Co < 1.5%; B <= 0.005%, it being understood that 1% <= Si + Al <= 2% and Cr+(3 ~ Mo) >= 0.3%, the balance ofthe composition consisting of iron and inevitable impurities resulting from the smelting, and the microstructure of the steel consisting of at least 75% bainite, residual austenite in an amount equal to 5% or higher, and martensite in an amount equal to 2% or higher.
L'invention concerne une tôle d'acier laminée à chaud de résistance supérieure à 1200 MPa, de rapport Re/Rm inférieur à 0,75, d'allongement à rupture supérieur à 10%, dont la composition comprend, les teneurs étant exprimées en poids : 0,10% <= C <= 0,25%, 1 %<= Mn < 3%, Al >= 0,015 %, Si<=1,985%, Mo < 0,30%, Cr <= 1,5%, S < 0,015%, P<= 0,1 %, Co<1 ,5%, B <= 0,005%, étant entendu que 1% <=Si+Al <=2%, Cr+(3 x Mo) >=0,3%, le reste de la composition étant constitué de fer et d'impuretés inévitables résultant de l'élaboration, la microstructure de l'acier étant constituée d'au moins 75% de bainite, d'austénite résiduelle en quantité supérieure ou égale à 5%, et de martensite en quantité supérieure ou égale à 2%.
Allain Sebastien
Colin Christine
Couturier Audrey
Iung Thierry
Arcelormittal France
Norton Rose Canada S.e.n.c.r.l.,s.r.l./llp
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