High yield ratio and high-strength thin steel sheet superior...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/58 (2006.01) C21D 9/46 (2006.01) C22C 38/42 (2006.01) C22C 38/48 (2006.01) C22C 38/50 (2006.01) C22C 38/54 (2006.01) C23C 2/06 (2006.01)

Patent

CA 2540762

A high-yield-ratio high-strength thin steel sheet excelling in weldability and ductility, constituted of a steel comprising, by mass, more than 0.030 to less than 0.10% of C, 0.30 to 0.80% of Si, 1.7 to 3.2% of Mn, 0.001 to 0.02% of P, 0.0001 to 0.006% of S, 0.060% or less of Al and 0.0001 to 0.0070% of N and further comprising 0.01 to 0.055% of Ti, 0.012 to 0.055% of Nb, 0.07 to 0.55% of Mo and 0.0005 to 0.0040% of B, these satisfying the relationship 1.1 <= 14 × Ti(%) + 20 × Nb(%) + 3 × Mo(%) + 300 × B(%) <= 3.7, with the balance composed of iron and unavoidable impurities, characterized in that the steel sheet exhibits a yield ratio of 0.64 to below 0.92, TS × El of 3320 or greater, YR × TS × El1/2 of >=2320 and maximum tensile strength (TS) of 780 MPa or greater.

La présente invention concerne une fine feuille d'acier à résistance élevée et rapport de rendement élevé, ayant une excellente aptitude à la soudure et une excellente ductilité, et étant constituée d'un acier qui comprend, en masse, plus de 0,030 à moins de 0,10 % de C, de 0,30 à 0,80 % de Si, de 1,7 à 3,2 % de Mn, de 0,001 à 0,02 % de P, de 0,0001 à 0,006 % de S, 0,060 % ou moins de Al, et de 0,0001 à 0,0070 % de N, et qui comprend également de 0,01 à 0,055 % de Ti, de 0,012 à 0,055 % de Nb, de 0,07 à 0,55 % de Mo, et de 0,0005 à 0,0040 % de B, à la condition que la relation suivante soit satisfaite: 1,1 <= 14 x Ti (%) + 20 x Nb (%) + 3 x Mo (%) + 300 x B (%) <= 3,7, et le complément étant composé de fer et d'impuretés inévitables. L'invention se caractérise en ce que la feuille d'acier a un rapport de rendement de 0,64 à moins de 0,92, TS x El vaut 3320 ou plus, YR x TS x El?1/2¿ est >=2320, et sa résistance à la traction maximale (TS) vaut 780 Mpa ou plus.

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