Austenitic high manganese steel having superior formability,...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/06 (2006.01) C21D 7/02 (2006.01) C21D 7/13 (2006.01) C21D 8/00 (2006.01) C21D 8/02 (2006.01) C22C 38/04 (2006.01) C21D 8/04 (2006.01)

Patent

CA 2100656

An austenitic high manganese steel having superior formability, strength and weldability, and a process for manufacturing the steel, are disclosed. The superior formability of the steel is suitable for use on automobiles and electronic panel. The steel has a composition of (in weight %) less than 1.5 % of C, 15.0-35.0 % of Mn, 0.1- 6.0 % of Al, and the balance of Fe and other indispensable impurities. The size of the austenite grains is less than 40.0 µm, and, one or more elements are added by selecting them from a group consisting of less than 0.60 % of Si, less than 5.0 % of Cu, less than 1.0 % of Nb, less than 0.5 % of V, less than 0.5 % of Ti, less than 9.0 % of Cr, less than 4.0 % of Ni, and less than 0.2 % of N, thereby providing an austenitic high manganese steel having superior formability, strength and weldability.

Acier austénitique au manganèse présentant une plasticité, une résistance et une soudabilité améliorées, et son procédé de fabrication. La plasticité améliorée de l'acier permet son utilisation dans les automobiles et les panneaux électroniques. L'acier est constitué de moins de 1,5 % en poids de C, de 15,0 à 35,0 % en poids de Mn, et de 0,1 à 6,0 % en poids de Al, le solde étant du Fe et d'autres impuretés indispensables. La grosseur des grains austénitiques est inférieure à 40,0 mum. On ajoute un ou plusieurs éléments sélectionnés dans le groupe constitué de moins de 0,60 % de Si, de moins de 5,0 % de Cu, de moins de 1,0 % de Nb, de moins de 0,5 % de V, de moins de 0,5 % de Ti, de moins de 9,0 % de Cr, de moins de 4,0 % de Ni, et de moins de 0,2 % de N. On obtient ainsi de l'acier austénitique au manganèse présentant une plasticité, une résistance et une soudabilité améliorées.

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