C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 1/18 (2006.01) C21D 6/00 (2006.01) C21D 7/13 (2006.01) C21D 8/02 (2006.01) C21D 8/04 (2006.01) C21D 9/48 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/12 (2006.01) C22C 38/14 (2006.01) C23C 2/06 (2006.01) C23C 2/12 (2006.01) C23F 17/00 (2006.01)
Patent
CA 2680623
The invention relates to a steel part having the following composition in wt %: 0.040% <= C <= 0.100%, 0.80% <= Mn <= 2.00%, Si <= 0.30%, S <= 0.005%, P<= 0.030%, 0.010% <= Al <= 0.070%, 0.015%<= Nb <= 0.100%, 0.030% <= Ti<= 0.080%, N <= 0.009%, Cu <= 0.100%, Ni <= 0.100%, Cr <= 0.100%, Mo <= 0.100%, Ca <= 0.006%, the balance of the composition consisting of iron and unavoidable impurities from the manufacturing process. The steel microstructure includes at least 75 % of equiaxed ferrite, martensite in an amount higher than or equal to5 % and lower than or equal to 20 %, and bainite in an amount lower than or equal to 10 %.
L'invention concerne une pièce en acier dont Ia composition comprend, les teneurs étant exprimées en poids : 0,040% <= C <= 0,100%, 0,80% <= Mn <= 2,00%, Si <= 0,30%, S <= 0,005%, P<= 0,030%, 0,010% <= Al <= 0,070%, 0,015%<= Nb <= 0,100%, 0,030%<= Ti<= 0,080%, N <= 0,009%, Cu <= 0,100%, Ni <= 0,100%, Cr <= 0,100%, Mo <= 0,100%, Ca <= 0,006%, Ie reste de Ia composition étant constitué de fer et d'impuretes inévitables résultant de I'élaboration, Ia microstructure de I'acier étant constitute d'au moins 75% de ferrite équiaxe, de martensite en quantité supérieure ou égale a 5% et inferieure ou égale à 20%, et de bainite en quantité inferieure ou égale a 10%.
Laurent Jean-Pierre
Malot Thierry
Arcelormittal France
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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