Method of producing a part with very high mechanical...

Details Method of producing a part with very high mechanical... Method of producing a part with very high mechanical...

C - Chemistry, Metallurgy

23

C

C23C 2/26 (2006.01) C23C 2/28 (2006.01)

Patent

CA 2627394

The invention relates to a method of producing a part with very high mechanical properties from a rolled coated sheet. According to the invention, more than 90 % of the thickness of a steel part is coated with a compound comprising at least a Fe-Zn-based phase having an iron weight percent content of no less than 65 % and a Fe/Zn ratio of between 1.9 and 4. The aforementioned compound is formed by at least one alloying heat treatment between the steel and a pre-coat, said pre-coat consisting of a zinc alloy containing between 0.5 and 2.5 wt.- % aluminium and optionally one or more elements selected from Pb <= 0.003 wt.- %, Sb <= 0.003 wt.- %, Bi <= 0.003 wt.- %, 0.002 wt.- % <= Si <= 0.07 wt.- %, La < 0.05 wt.- %, Ce < 0.05 wt.- %, the remainder comprising zinc and inevitable impurities.

L'invention concerne une pièce en acier revêtu d'un composé constitué, sur plus de 90% de son épaisseur, d'au moins une phase à base Fe-Zn dont la teneur pondérale en fer est supérieure ou égale à 65% et dont le rapport Fe/Zn est compris entre 1 ,9 et 4, ledit composé étant formé par au moins un traitement thermique d'alliation entre ledit acier et un pré-revêtement, ledit pré- revêtement étant constitué d'un alliage de zinc comprenant, les teneurs étant exprimées en poids, entre 0,5 et 2,5% d'aluminium, et à titre optionnel, un ou plusieurs éléments choisis parmi : Pb <=0,003 %, Sb <=0,003%, Bi <=0,003%, 0,002%<=Si<=0,070%, La< 0,05 %, Ce<0,05 %, le solde étant constitué de zinc et des inévitables impuretés.

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