NICKEL-CHROMIUM-ALUMINUM ALLOY HAVING GOOD PROCESSABILITY, CREEP RESISTANCE AND CORROSION RESISTANCE

摘要

A nickel-chromium-aluminum-iron alloy includes (in wt.-%) 24 to 33% chromium, 1.8 to 4.0% aluminum, 0.10 to 7.0% iron, 0.001 to 0.50% silicon, 0.005 to 2.0% manganese, 0.00 to 0.60% titanium, 0.0002 to 0.05% each of magnesium and/or calcium, 0.005 to 0.12% carbon, 0.001 to 0.050% nitrogen, 0.0001 to 0.020% oxygen, 0.001 to 0.030% phosphorus, not more than 0.010% sulfur, not more than 2.0% molybdenum, not more than 2.0% tungsten, the remainder nickel and the usual process-related impurities, wherein the following relations must be satisfied: Cr+Al≧28 (2a) and Fp≦39.9 (3a) with Fp=Cr+0.272* Fe+2.36*Al+2.22 *Si+2.48*Ti+0.374*Mo+0.538*W−11.8*C (4a), wherein Cr, Fe, Al, Si, Ti, Mo, W and C is the concentration of the respective elements in % by mass.

主权项

1. Nickel-chromium-aluminum alloy with (in % by wt) 24 to 33% chromium, 1.8 to 4.0% aluminum, 0.10 to 7.0% iron, 0.001 to 0.50% silicon, 0.005 to 2.0% manganese, 0.00 to 0.60% titanium, respectively 0.0002 to 0.05% magnesium and/or calcium, 0.005 to 0.12% carbon, 0.001 to 0.050% nitrogen, 0.0001
0.020% oxygen, 0.001 to 0.030% phosphorus, max. 0.010% sulfur, max. 2.0% molybdenum, max. 2.0% tungsten, the rest nickel and the usual process-related impurities, wherein the following relationships must be satisfied:
Cr+Al≧28  (2a)and Fp≦39.9 with  (3a)Fp=Cr+0.272*Fe+2.36*Al+2.22*Si+2.48*Ti+0.374*Mo+0.538*W−11.8*C  (4a) where Cr, Fe, Al, Si, Ti, Mo, W and C are the concentrations of the elements in question in % by mass.