Process for manufacturing iron-carbon-manganese austenitic...

Details Process for manufacturing iron-carbon-manganese austenitic... Process for manufacturing iron-carbon-manganese austenitic...

C - Chemistry, Metallurgy

22

C

C22C 38/04 (2006.01) C21D 8/02 (2006.01) C23C 30/00 (2006.01)

Patent

CA 2657508

An austenitic steel sheet excellent in resistance to delayed cracking, the composition of said steel comprising, in weight: 0,35% < C < 1,05%,15%< Mn < 26%, Si < 3%, Al < 0,050%, S < 0,030%, P< 0,080%, N < 0,1 %, at least one metallic element X chosen among vanadium, titanium, niobium, molybdenum, chromium:0,050% <V < 0,50%, 0,040% <=Ti < 0,50%, 0,070% < Nb < 0,50%, 0,14%<Mo < 2%, 0,070% <Cr < 2 % and optionally, one or several elements chosen among 0,0005% < B <0,010%, Ni < 2%, Cu < 5%,the remainder being iron and unavoidable impurities inherent to fabrication, including hydrogen, the quantity Xp of said at least one metallic element under the form of carbides, nitrides or carbonitrides being, in weight : 0,030% <VP < 0,40%, 0,030%<Tip < 0,50%, 0,040% < Nbp < 0,40%, 0,14%<Mop < 0,44%, 0,070% <Crp< 0,6%, the hydrogen content Hmax designating the maximal hydrogen content that can be measured from a series of at least five specimens, and the quantity Xp, in weight, being such that (I) <3,3.

L'invention concerne une feuille d'acier austénitique excellente en terme de résistance à la fissuration différée, la composition de ladite feuille comprenant, en poids : 0,35 % < C < 1,05 %, 15 %< Mn < 26 %, Si < 3 %, Al < 0,050 %, S < 0,030 %, P < 0,080 %, N < 0,1 %, au moins un élément métallique X choisi parmi le vanadium, le titane, le niobium, le molybdène, le chrome : 0,050 % < V < 0,50 %, 0,040 % <= Ti < 0,50 %, 0,070 % < Nb < 0,50 %, 0,14 %< Mo < 2 %, 0,070 % < Cr < 2 % et éventuellement, un ou plusieurs éléments choisis parmi 0,0005 % < B < 0,010 %, Ni < 2 %, Cu < 5 %, le reste étant du fer et des impuretés inévitables inhérentes à la fabrication, incluant de l'hydrogène, la quantité Xp dudit au moins un élément métallique sous la forme de carbures, nitrures ou carbonitrures représentant, en poids : 0,030 % < Vp < 0,40 %, 0,030 %< Tip < 0,50 %, 0,040 % < Nbp < 0,40 %, 0,14 %< Mop < 0,44 %, 0,070 % < Crp < 0,6 %, la teneur en hydrogène Hmax désignant la teneur maximale en hydrogène qui peut être mesurée à partir d'une série d'au moins cinq échantillons, et la quantité Xp, en poids, étant telle que (I) < 3,3.

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