Steel excellent in toughness of weld heat affected zone

Details Steel excellent in toughness of weld heat affected zone Steel excellent in toughness of weld heat affected zone

C - Chemistry, Metallurgy

22

C

C22C 38/14 (2006.01) C21D 9/46 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/08 (2006.01) C22C 38/16 (2006.01)

Patent

CA 2602076

The present invention is a steel excellent in toughness of a weld heat affected zone characterized by containing, by mass%, C: 0.02 to 0.06%, Si: 0.05 to 0.30%, Mn: 1.7 to 2.7%, P: 0.015% or less, S: 0.010% or less, Ti: 0.005 to 0.015%, O: 0.0010 to 0.0045, and N: 0.0020 to 0.0060% and comprising a balance of iron and unavoidable impurities, having an amount of intermixture of impurities limited to Al: 0.004% or less, Nb: 0.003% or less, and V: 0.030% or less, and having a CeH represented by formula (A) in the range of 0.04 or less: CeH = C+1/4Si-1/24Mn+1/48Cu+1/32Ni+1/0.4Nb+1/2V...(A) where, C, Si, Mn, Cu, Ni, Nb, and V show steel compositions (mass%).

L'invention porte sur un acier excellant par sa dureté dans les zones affectées par la chaleur de la soudure et dont la composition massique est la suivante: 0,02 à 0,06 % de C, 0,05 à 0,30 % de Si, 1,7 à 2,7 % de Mn, 0,015 % ou moins de P, 0,010 % ou moins de S, 0,005 à 0,015 % de Ti, 0,0010 à 0,0045 % de O, 0,0020 à 0,0060 % de N et le solde de Fe et des impuretés inévitables. En ce qui concerne le mélange d'impuretés, la teneur en Al mélangé est limitée à 0,004 % ou moins, celle en Nb mélangé, à 0,003% ou moins, et celle en V mélangé, à 0,030% ou moins, et le CeH de la formule (A) est de 0,04 ou moins. Dans la formule (A): CeH=C+1/4Si-1/24Mn+1/48Cu+1/32Ni+1/0,4Nb+1/2V et chacun des composants C, Si, Mn, Cu, Ni, Nb et V est exprimé en % massique.

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