High strength steel plate having improved workability and...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/00 (2006.01) C21D 8/02 (2006.01) C21D 9/46 (2006.01) C22C 38/04 (2006.01) C22C 38/02 (2006.01) C22C 38/06 (2006.01)

Patent

CA 2351830

A TRIP-type high strength steel plate having good workability is provided which, while reducing the amount of alloying elements added which increase the production cost, ensures a contemplated retained austenite structure, has good adhesion to zinc plating, and can also be applied to highly corrosion resistant surface treated steel plates. The high strength steel plate having improved workability and plating adhesion is such that a high concentration, i.e., 0.03 to 2.0% by weight, of nitrogen is incorporated, the contents of silicon and aluminum, which form nitride, are preferably regulated respectively to not more than 0.5% by weight and not more than 0.3% by weight, and, in addition, calcium, sodium, magnesium, etc. are optionally added to control the formation of iron nitride, whereby the volume fraction of the retained austenite phase in the metal structure is regulated to 3 to 20% by weight.

Ce document présente une plaque d'acier à haute résistance de type TRIP offrant une bonne malléabilité, dont le mode de production permet de réduire la quantité de matériaux d'alliage requis (qui influe sur le coût de production) et assure la rétention de la structure austénitique recherchée. Ce type de plaques d'acier facilite aussi l'adhésion des atomes de zinc lors du placage et se prête à des traitements de surface permettant d'obtenir une résistance élevée à la corrosion. Ces plaques d'acier à haute résistance se caractérisent par une malléabilité et une susceptibilité au placage améliorées. Lorsqu'on ajoute une proportion élevée d'azote (de 0,03 % à 2,0 %, au poids) à l'acier dont ces plaques sont constituées, son contenu en silice et en aluminium, qui se composent pour former des nitrures, doit être maintenu, respectivement, à un maximum de 0,5 % et 0,3 % (au poids). On peut aussi y ajouter du calcium, du sodium, du magnésium et d'autres éléments pour contrôler la formation de nitrure ferreux, afin d'obtenir une fraction volumique d'austénite variant de 3 % à 20 % (au poids) dans la structure du métal.

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