High tensile strength steel material having excellent...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/00 (2006.01) C21D 8/00 (2006.01) C22C 38/14 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2600747

A high tensile steel product having a tensile strength of 600 MPa or higher and being excellent in delayed fracture resistance, characterized in that it has such a composition, in mass %, that C: 0.02 to 0.25 %, Si: 0.01 to 0.8 %, Mn: 0.5 to 2.0 %, Al: 0.005 to 0.1 %, N: 0.0005 to 0.008 %, P: 0.03 % or less, S: 0.03 % or less, one or more of Mo, Nb, V and Ti: a specific amount, and the balance: Fe and inevitable impurities, and it contains precipitates containing one or more of Mo, Nb, V and Ti, and includes doposits having an average particle diameter of 20 nm or less in an amount of 5 pieces/250000 nm2 or more; and a method for the production thereof.

L~invention concerne un produit en acier à haute résistance à la traction ayant une résistance à la traction de 600 MPa ou plus et étant excellent en termes de résistance à la rupture différée, caractérisé en ce que sa composition est la suivante, en pourcentage en masse, de 0,02 à 0,25 % de C, de 0,01 à 0,8 % de Si, de 0,5 à 2,0 % de Mn, de 0,005 à 0,1 % d~Al, de 0,0005 à 0,008 % de N, 0,03 % ou moins de P, 0,03 % ou moins de S, une quantité spécifique d~un ou plusieurs éléments parmi Mo, Nb, V et T, le complément étant constitué de Fe et d~impuretés inévitables, et il contient des précipités contenant un ou plusieurs éléments parmi Mo, Nb, V et Ti, et comprend des dépôts ayant un diamètre moyen de particules de 20 nm ou moins en une quantité de 5 pièces/250000 nm2 ou plus ; et son procédé de production.

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