Stainless steel tube for automobile structure

Details Stainless steel tube for automobile structure Stainless steel tube for automobile structure

C - Chemistry, Metallurgy

22

C

C22C 38/18 (2006.01) C22C 38/02 (2006.01) C22C 38/20 (2006.01)

Patent

CA 2384563

A stainless steel tube for a automobile structure member having excellent formability for secondary operation comprises: a chemical composition including not more than 0.20 mass % of C; not more than 1.5 mass % of Si; not more than 2.0 mass % of Mn; 10-18 mass % of Cr; not more than 0.03 mass % of N; or further at least one type of element selected from the group of : not more than 0.6 mass % of Cu; not more than 0.6 mass % of Ni; not more than 2.5 mass % of Mo; not more than 1.0 mass % of Nb; not more than 1.0 mass % of Ti; and not more than 1.0 mass % of V; Fe as the remainder and the inevitable impurities; and a structure which is constituted of ferrite or ferrite and martensite, wherein the TE value defined by the following formula (1) exceeds 25,000 MPa.cndot.%. TE value = TS × (El + 21.9) In the aforementioned formula, TS represents the tensile strength in the tube axial direction (MPa), and El represents the elongation in the tube axial direction (%).

La présente invention concerne un tuyau en acier inoxydable qui comporte une structure comprenant de la ferrite ou un mélange de ferrite et de martensite et qui a une composition chimique contenant jusqu'à 0,20 % de carbone, jusqu'à 1,5 % de silicium, jusqu'à 2,0 % de manganèse, entre 10 et 18 % de chrome, jusqu'à 0,03 % d'azote, au moins un ingrédient facultatif sélectionné parmi les éléments suivants, jusqu'à 0,6 % de cuivre, jusqu'à 0,6 % de nickel, jusqu'à 2,5 % de molybdène, jusqu'à 1,0 % de niobium, jusqu'à 1,0 % de titane et jusqu'à 1,0 % de vanadium, le reste étant du fer et des impuretés inévitables. Sa valeur d'allongement en traction (TE) définie par l'équation TE = TS x (E1 + 21,9)est supérieure à 2500 % [TS étant la contrainte de rupture dans le sens de l'axe du tuyau (MPa) et E1 étant l'allongement dans le sens de l'axe du tuyau (en %) ].

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