Object comprising a steel part of a metal construction...

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/02 (2006.01) C21D 9/50 (2006.01) C22C 38/04 (2006.01) C22C 38/22 (2006.01)

Patent

CA 2572869

The invention relates to an object comprising at least one steel part whose composition consists of the following contents expressed by weight: 0.005-0.27 % carbon, 0.5-1.6 % manganese, 0.1-0.4 % silicon, less than 2.5 % chromium content, less than 1 % molybdenum content, optionally one or several elements selected form nickel, copper, aluminium, niobium, vanadium, titanium, boron, zirconium and nitrogen, the rest being iron and impurities of production, wherein said steel part comprises at least one area welded by a high power density beam and is characterised in that the microstructure of the welded area is constituted of 60-75 % self-tempered martensite, preferentially 60-70 % self-tempered martensite, and, in addition, of 40-30 % lower bainite.

L'invention décrit un objet comprenant au moins une partie en acier dont la composition comprend, les teneurs étant exprimées en poids, du carbone en teneur comprise entre 0,005 et 0,27 %, du manganèse entre 0,5 et 1,6 %, du silicium entre 0,1 et 0,4 %, du chrome en teneur inférieure à 2,5 %, du Mo en teneur inférieure à 1 %, éventuellement un ou plusieurs éléments choisis parmi le nickel, le cuivre, l'aluminium, le niobium, le vanadium, le titane, le bore, le zirconium, l'azote, le reste étant du fer et des impuretés résultant de l'élaboration, ladite partie en acier comportant au moins une zone soudée par faisceau à haute densité d'énergie, caractérisé en ce que ladite zone soudée présente une microstructure constituée de 60 à 75 % de martensite auto- revenue et, en complément, de 40 à 25 % de bainite inférieure, et préférentiellement 60 à 70 % de martensite auto-revenue et, en complément, de 40 à 30 % de bainite inférieure.

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