Seamless steel tubes and method for producing the same

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/00 (2006.01) C21D 8/10 (2006.01) C21D 9/08 (2006.01) C22C 38/38 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2564420

A seamless steel pipe, characterized in that it contains, in mass %, 0.30 to 0.50 % of C, 0.5 % or less of Si, 0.3 to 2.0 % of Mn, 0.025 % or less of P, 0.005 % or less of S, 0.15 to 1.0 % of Cr, 0.001 to 0.05 % of Al, 0.005 to 0.05 % of Ti, 0.02 % or less of N, 0.0005 to 0.01 % of B, and 0.0050 % or less of O (oxygen), and Beff defined by the following formula (a) or (b) takes a value of 0.0001 or more, where Beff = B-10.8×(N-14×Ti/47.9)/14 --- (a) when Neff = N-14×Ti/47.9 >= 0, and Beff = B --- (b) when Neff = N- 14×Ti/47.9 < 0. The above seamless steel pipe is excellent in all of cold workability, hardenability, toughness and torsional fatigue strength, and thus is optimum as a material for a hollow axis for use in a hollow driveshaft being formed in one piece.

Un tuyau en acier inoxydable, caractérisé par le fait qu'il contient, en % de masse, de 0,30 à 0,50% de C, 0,5% ou moins de Si, de 0,3 à 2,0% de Mn, 0,025% ou moins de P, 0,005% ou moins de S, de 0,15 à 1,0% de Cr, de 0,001 à 0,05% d'Al, de 0,005 à 0,05% de Ti, 0,02% ou moins de N, de 0,0005 à 0,01% de B et 0,0050% ou moins de O (oxygène) et Beff défini par la formule suivante (a) ou (b) prend une valeur de 0,0001 ou plus, où Beff = B-10,8x(N-14xTi/47,9)/14 --- (a) lorsque Neff = N-14xTi/47,9 >= 0 et Beff = B --- (b) lorsque Neff = N-14xTi/47,9 < 0. Le tuyau en acier inoxydable qui précède est excellent pour tout ce qui est travail à froid, trempabilité, robustesse et résistance à la torsion ; il convient donc parfaitement comme matériau pour un axe creux à utiliser dans un arbre de transmission creux, constitué d'une seule pièce.

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