Brazing material, a method of brazing, a brazed article and...

B - Operations – Transporting – 23 – K

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B23K 35/30 (2006.01)

Patent

CA 2669961

The present invention relates an iron based brazing material comprising an alloy consisting essentially of: 15 to 30 wt% chromium (Cr); 0 to 5.0 wt% manganese (Mn); 15 to 30 wt% nickel (Ni); 1.0 to 12 wt% molybdenum (Mo); 0 to 4.0 wt% copper (Cu); 0 to 1.0 wt% nitrogen (N); 0 to 20 wt% silicone (Si); 0 to 2.0 wt% boron (B); 0 to 16 wt% phosphorus (P); optionally 0.0 to 2.5 wt% of each of one or more of elements selected from the group consisting of carbon (C), vanadium (V), titanium (Ti), tungsten (W), aluminium (Al), niobium (Nb), hafnium (Hf), and tantalum (Ta); the alloy being balanced with Fe, and small inevitable amounts of contaminating elements; and wherein Si, B and P are in amounts effective to lower melting temperature, and Si, B, and P are contained in amounts according to the following formula: Index = wt% P + 1.1 x wt% Si + 3 x wt% B, and the value of the Index is within the range of from about 5 wt% to about 20. The present invention relates also to a method of brazing article of stainless steel, and an article of stainless steel.

L'invention concerne un matériau de brasage à base de fer comprenant un alliage renfermant principalement entre 15 et 30% en poids de chrome (Cr); entre 0 et 5.0% en poids de manganèse (Mn); entre 15 et 30% en poids de cuivre (Ni); entre 1.0 et 12% en poids de molybdène (Mo); entre 0 et 4.0 % en poids de cuivre (Cu); entre 0 et 1% en poids d'azote (N); entre 0 et 20% en poids de silicone (Si); entre 0 et 2.0% en poids de boron (B); entre 0 et 16% en poids de phosphore (P); éventuellement entre 0.0 et 2.5% en poids d'au moins un élément sélectionné dans le groupe constitué de carbone (C), de vanadium (V), de titane (Ti), de tungstène (W), d'aluminium (Al), de niobium (Nb), de hafnium (Hf) et de tantale (Ta); l'alliage s'équilibre avec Fe et avec de petites quantités inévitables d'éléments contaminants; et Si, B et P sont en quantités efficaces pour abaisser la température de fusion et Si, B et P sont contenus dans des quantités selon la formule suivante: Indice = %en poids P + 1.1 x % en poids Si + 3 x % en poids à environ 20. L'invention concerne également un procédé de brasage d'un article en acier inoxydable et un article en acier inoxydable.

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