Seamless steel tube for an airbag accumulator and a process...

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 38/22 (2006.01) C21D 8/10 (2006.01) C22C 38/02 (2006.01) C22C 38/04 (2006.01) C22C 38/06 (2006.01) C22C 38/26 (2006.01) C22C 38/28 (2006.01) C22C 38/38 (2006.01) C22C 38/44 (2006.01) C22C 38/58 (2006.01)

Patent

CA 2667534

A seamless steel tube for airbag accumulators which can be produced by normalizing heat treatment alone without quenching and tempering and has a tensile strength of 850MPa or above and burst resistance at -20°C. The seamless steel tube has a steel composition which contains by mass C: 0.08 to 0.20%, Si: 0.1 to 1.0%, Mn: 0.6 to 2.0%, P: 0.025% or below, S: 0.010% or below, Cr: 0.05 to 1.0%, Mo: 0.05 to 1.0%, Al: 0.002 to 0.10%, at least one member selected from among Ca: 0.0003 to 0.01%, Mg: 0.0003 to 0.01% and REM (rare earth elements): 0.0003 to 0.01%, and at least one member selected form between Ti: 0.002 to 0.1% and Nb: 0.002 to 0.1% and has a Ceq value of 0.45 to 0.63 as defined by the formula (1) and a mixed metal structure of ferrite and bainite: Ceq = C + Si/24 + Mn/6 + (Cr+Mo)/5 + (Ni+Cu)/15... (1) wherein each symbol of element represents the content of the element in % by mass.

L'invention concerne un tube en acier sans soudure pour des accumulateurs pour air-bag qui peuvent être obtenus par un seul traitement thermique de normalisation sans trempe et revenu et qui présente une résistance à la traction de 850 MPa ou plus et une résistance à l'éclatement à -20°C. Le tube en acier sans soudure a une composition d'acier qui contient en masse de 0,08 à 0,20 % de C, de 0,1 à 1,0 % de Si, de 0,6 à 2,0 % de Mn, 0,025 % ou moins de P, 0,010 % ou plus de S, de 0,05 à 1,0 % de Cr, de 0,05 à 1,0 % de Mo, de 0,002 à 0,10 % d'Al, au moins un élément choisi parmi le Ca (de 0,0003 à 0,01 %), le Mg (de 0,0003 à 0,01 %) et les éléments des terres rares (REM)(de 0,0003 à 0,01 %), et au moins un élément choisi parmi le Ti (de 0,002 à 0,1 %) et le Nb (de 0,002 à 0,1 %) et a une valeur Ceq de 0,45 à 0,63 telle que définie par la formule (1) et une structure métallique mixte de ferrite et de bainite : Ceq = C + Si/24 + Mn/6 + (Cr+Mo)/5 + (Ni+Cu)/15 ~ (1) où chaque symbole d'élément représente la teneur de l'élément en % en masse.

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