Acid and alkali resistant nickel-chromium-molybdenum-copper alloys
A nickel-chromium-molybdenum-copper alloy resistant to 70% sulfuric acid at 93° C. and 50% sodium hydroxide at 121° C. for acid and alkali neutralization in the field of waste management; the alloy contains, in weight percent, 27 to 33 chromium, 4.9 to 7.8 molybdenum, greater than 3.1 but no more than 6.0 copper, up to 3.0 iron, 0.3 to 1.0 manganese, 0.1 to 0.5 aluminum, 0.1 to 0.8 silicon, 0.01 to 0.11 carbon, up to 0.13 nitrogen, up to 0.05 magnesium, up to 0.05 rare earth elements, with a balance of nickel and impurities.
1. A nickel-chromium-molybdenum-copper alloy resistant to 70% sulfuric acid at 93° C. and 50% sodium hydroxide at 121° C., consisting essentially of:
30 to 33 wt. % chromium
5.0 to 6.2 wt. % molybdenum
3.5 to 4.0 wt. % copper
Up to 1.5 wt. % iron
0.3 to 0.7 wt. % manganese
0.1 to 0.4 wt. % aluminum
0.1 to 0.6 wt. % silicon
0.02 to 0.10 wt. % carbon
Up to 0.13 wt. % nitrogen
Up to 0.05 wt. % magnesium
Up to 0.05 wt. % rare earth elements
with a balance of nickel and impurities.
2. A nickel-chromium-molybdenum-copper alloy resistant to 70% sulfuric acid at 93° C. and 50% sodium hydroxide at 121° C., consisting essentially of:
31 wt. % chromium
5.6 wt. % molybdenum
3.8 wt. % copper
1.0 wt. % iron
0.5 wt. % manganese
0.4 wt. % silicon
0.3 wt. % aluminum
0.03 to 0.07 wt. % carbon
with a balance of nickel, nitrogen, impurities, and traces of magnesium.
3. A nickel-chromium-molybdenum-copper alloy resistant to 70% sulfuric acid at 93° C. and 50% sodium hydroxide at 121° C., consisting essentially of:
31 wt. % chromium
5.6 wt. % molybdenum
3.8 wt. % copper
1.0 wt. % iron
0.5 wt. % manganese
0.4 wt. % silicon
0.3 wt. % aluminum
0.03 to 0.07 wt. % carbon
with a balance of nickel, nitrogen, impurities, traces of magnesium and the rare earth elements.