A steel composition for the production of cold rolled...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/00 (2006.01) C21D 8/00 (2006.01) C21D 8/02 (2006.01)

Patent

CA 2507378

The present invention is related to a steel composition intended to be used in a process comprising a cold rolling step, for the production of uncoated, electro-galvanised or hot dip galvanised TRIP steel products, said composition being characterised by a specific addition of phosphorus. The latter is added in order to reach the desired mechanical properties (high tensile strength in combination with high elongation) while keeping a good weldability by sufficiently reducing the carbon content. The invention is further related to a process for producing a steel product, and to said steel product obtained, said product having the composition of the invention.

La présente invention concerne une composition d'acier destinée à être utilisée dans un procédé comprenant une opération de laminage à froid pour la production de produits en acier TRIP non revêtus, électrogalvanisés ou galvanisés à chaud, ladite composition étant caractérisée par une addition spécifique de phosphore. On ajoute ce dernier de façon à obtenir les propriétés mécaniques souhaitées (haute résistance à la traction en combinaison avec allongement élevé) tout en conservant une bonne soudabilité par réduction suffisante de la teneur en carbone. L'invention concerne en outre un procédé de production d'un produit en acier ainsi que le produit en acier ainsi obtenu, ledit produit comprenant la composition de l'invention.

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