High tensile-strength galvanized steel sheet and process for...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/38 (2006.01) C21D 8/02 (2006.01) C21D 9/46 (2006.01) C23C 2/06 (2006.01) C23C 2/28 (2006.01)

Patent

CA 2684031

Disclosed is a high-strength hot-dip galvanized steel sheet having a composition consisting of not less than 0.05% but less than 0.12% of C, not less than 0.01% but less than 0.35% of Si, 2.0-3.5% of Mn, 0.001-0.020% of P, 0.0001-0.0030% of S, 0.005-0.1% of Al, 0.0001-0.0060% of N, more than 0.5% but not more than 2.0% of Cr, 0.01-0.50% of Mo, 0.010-0.080% of Ti, 0.010-0.080% of Nb and 0.0001-0.0030% of B and the balance of Fe and unavoidable impurities, while having a structure containing a ferrite phase having a volume fraction of 20-70% and an average crystal grain size of not more than 5 µm. This high-strength hot-dip galvanized steel sheet has a high tensile strength of not less than 980 MPa (TS >= 980 MPa), while being excellent in processability and weldability.

L'invention concerne une tôle d'acier galvanisé à chaud au trempé, haute résistance, ayant une composition comprenant au moins 0,05 % mais moins de 0,12 % de C, au moins 0,01 % mais moins de 0,35 % de Si, 2,0 à 3,5 % de Mn, 0,001 à 0,020 % de P, 0,0001 à 0,0030 % de S, 0,005 à 0,1 % d'Al, 0,0001 à 0,0060 % d'N, plus de 0,5 % mais pas plus de 2,0 % de Cr, 0,01 à 0,50 % de Mo, 0,010 à 0,080 % de Ti, 0,010 à 0,080 % de Nb et 0,0001 à 0,0030 % de B et le reste de Fe et d'autres impuretés inévitables, tout en ayant une structure contenant une phase ferritique possédant une fraction volumique de 20 à 70 % et une taille de grain des cristaux moyenne non supérieure à 5 µm. Cette tôle d'acier galvanisé à chaud au trempé, haute résistance présente une résistance à la traction élevée d'au moins 980 MPa (TS >= 980 MPa), tout en possédant des propriétés de mise en AEuvre et de soudabilité excellentes.

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