C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
C22C 38/12 (2006.01) C21D 9/46 (2006.01) C22C 38/04 (2006.01) C22C 38/08 (2006.01) C22C 38/14 (2006.01) C22C 38/16 (2006.01) C23C 2/02 (2006.01) C23C 2/06 (2006.01) C23C 2/28 (2006.01) C21D 8/02 (2006.01) C21D 8/04 (2006.01)
Patent
CA 2353492
A hot-dip galvanized high-strength steel sheet having superior workability and galvanizability containing: 0.01% to 0.20% by weight of C; 1.0% by weight or less of Si; more than 1.5% to 3.0% by weight of Mn; 0.10% by weight or less of P; 0.05% by weight or less of S; 0.10% by weight or less of Al; 0.010% by weight or less of N; 0.010% to 1.0% by weight in total of at least one element selected from the group consisting of Ti, Nb, and V; and the balance being Fe and incidental impurities; in which the steel sheet has the metal structure in which the areal rate of the ferrite phase is 50% or more, the ferrite phase has an average grain diameter of 10 µm or less, and the thickness of a band-like structure composed of the second phase satisfies the relationship Tb/T <= 0.005, where Tb is the average thickness in the sheet thickness direction of the band-like structure and T is the thickness of the steel sheet, and a method for producing the same. To provide a method for producing a hot-dip galvanized high-strength steel sheet in which superior workability and high strength are obtained and moreover satisfactory galvanizability is obtained when galvanizing is performed using facilities such as a continuous galvanizing line.
La présente invention concerne une tôle d'acier galvanisée par immersion à chaud présentant de bonnes qualités de résistance, de formabilité et de galvanisation. Cette tôle a une composition chimique caractéristique faisant intervenir en masse, 0,01% à 0,2% de carbone, 1% au maximum de silicium, au moins 1,5% de manganèse, au maximum 3% de phosphore, au maximum 0,05% de soufre, au maximum 0,1% d'aluminium, au maximum 0,01% d'azote, l'un au moins des éléments titane, niobium et vanadium pour 0,01% à 1% du total, le complément étant constitué du fer et des impuretés inévitables. La structure du métal présente une proportion surfacique de phase ferrite d'au moins 50%, pour un diamètre moyen du grain dans la phase ferrite n'excédant pas 10 mu m. En outre, l'épaisseur de la structure en ruban faite d'une seconde phase est telle que Tb/T </= 0,005, "Tb" représentant l'épaisseur moyenne de la structure en ruban dans l'axe de l'épaisseur de la tôle. L'invention concerne également un procédé de production de cette tôle d'acier. En l'occurrence, cette tôle, qui se prête à la production en continu par immersion à chaud dans le bain de galvanisation ou analogue, se distingue par ses bonnes qualités de formabilité, de résistance et de galvanisation.
Furukimi Osamu
Osawa Kazunori
Sakata Kei
Shinohara Akio
Suzuki Yoshitsugu
Jfe Steel Corporation
Kawasaki Steel Corporation
Moffat & Co.
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