Adding alloying elements to molten metals or alloys, esp. steel - using mother alloy based on nickel or cobalt and dissolving rapidly in molten metal so yield of alloying elements is increased

摘要

The final compsn. of the molten metal will include Ni and/ or Co; and at least one alloying element (I) with a high m.pt. is to be added to the melt. Elements (I) consists of B, Ce, Cr, Mn, Mo, Nb, Ti, Wv, V, and/or Zr. Elements (I) are first made into a mother alloy, which is based on Ni or Co, and contains 8-80% of at least one element (I); and the powdered mother alloy is added to the melt. The mother alloy pref. contains 0.1-25% Fe w.r.t. the total Fe + Ni + Co; and possibly 0.1-2% each of Al and Si, and/ or 0.1-1% Mg. Mother alloys based on Ni pref. contain 12-20% B; or 65-90% esp. 78-85% Ce; or 40-80% esp. 60-65% Cr. Mother alloys based on Co pref. contain 8-10% B; or 40-70% esp. 45-65% Cr; and numerous pref. mother alloys are listed. Elements (I) dissolve more rapidly in a melt when they are in a mother alloy based on Ni or Co, so a homogeneous melt with an improved yield of elements (I) is obtd.