Nickel-chromium-aluminum alloy with good processability, creep resistance, and corrosion resistance, and use thereof

A nickel-chromium-aluminum alloy containing (in mass-%) 12 to 30% chromium, >3.2 to <4.0% aluminum, 0.1 to 7.0% iron, 0.001 to 0.50% silicon, 0.001 to 2.0% manganese, 0.00 to 1.00% titanium, 0.00 to 1.10% niobium, 0.00 to 0.5% copper, 0.00 to 5.00% cobalt, respectively 0.0002 to 0.05% magnesium and/or calcium, 0.001 to 0.12% carbon, 0.001 to 0.050% nitrogen, 0.001 to 0.030% phosphorus, 0.0001 to 0.020% oxygen, max 0.010% sulfur, max 2.0% molybdenum, max 2.0% tungsten, the rest nickel with a minimum content of ≥50% and the common process-related impurities for the use of strips, sheets, wires, rods, longitudinally welded tubes or seamless tubes at temperatures of 250° C. up to at most 1000° C. in solar tower power plants with use of chloride and/or carbonate salt melts as heat-transfer medium, wherein the chloride and/or carbonate salt melts are

• 60-75% zinc chloride, 2-15% sodium chloride and 15-30% potassium chloride, or
• 30-50% magnesium chloride and 50-70% potassium chloride, or
• 25-40% sodium carbonate, 25-40% potassium carbonate and 25-40% lithium carbonate,
• wherein the following condition must be satisfied for assurance of a good processability:
• FV≥0.9 with
• FV=4.88050−0.095546*Fe−0.0178784*Cr−0.992452*Al−1.51498*Ti−0.506893*Nb+0.0426004*Al*Fe
• wherein Fe, Cr, Al, Ti and Nb are the concentrations of the elements in question in mass-%.