具有确切铬及铜含量之抗酸硷之镍－铬－钼－铜合金

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本发明系关於一种对93℃下之70%硫酸及121℃下之50%氢氧化钠具抗性之镍-铬-钼-铜合金，其系用於废弃物处理领域中之酸硷中和；该合金含有27重量%至33重量%之铬、4.9重量%至7.8重量%之钼、3.1重量%至6.0重量%之铜(当铬介於30重量%与33重量%之间时)或4.7重量%至6.0重量%之铜(当铬介於27重量%与29.9重量%之间时)、至多3.0重量%之铁、0.3重量%至1.0重量%之锰、0.1重量%至0.5重量%之铝、0.1重量%至0.8重量%之矽、0.01重量%至0.11重量%之碳、至多0.13重量%之氮、至多0.05重量%之镁、至多0.05重量%之稀土元素，且其余为镍及杂质。可添加钛或另一MC碳化物形成剂以增强该合金之热稳定性。 A nickel-chromium-molybdenum-copper alloy resistant to 70% sulfuric acid at 93℃ and 50% sodium hydroxide at 121℃ 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, 3.1 to 6.0 wt.% copper (when chromium is between 30 and 33 wt.%) or 4.7 to 6.0 wt.% copper (when chromium is between 27 and 29.9 wt.%), 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. Titanium or another MC carbide former can be added to enhance thermal stability of the alloy.